Co-reporter:Huiwen He, Si Chen, Xiaoqian Tong, Zhihang An, Meng Ma, Xiaosong Wang, and Xu Wang
Langmuir November 21, 2017 Volume 33(Issue 46) pp:13332-13332
Publication Date(Web):October 26, 2017
DOI:10.1021/acs.langmuir.7b02893
Aromatic groups are introduced into the end peripherals of polyhedral oligomeric silsesquioxane (POSS) core-based organic/inorganic hybrid supramolecules to get a novel dendrimer gelator POSS-Z-Asp(OBzl) (POSS-ASP), which have eight aspartate derivative arms to make full use of strong π–π stacking forces to get strong supramolecular gels in addition to multiple hydrogen bindings and van der Waals interactions. POSS-ASP can self-assemble into three-dimensional nanoscale gel networks to provide hybrid physical gels especially with strong mechanical properties and fast-recovery behaviors. Two totally different morphologies of the connected spherical particle structures and banded ultralong fibers are observed owing to the polarity of solvents confirmed by the scanning electron microscopy, polarized optical microscopy, and transmission electron microscopy techniques, expecting the existing various self-assembly models and illustrating the peripherals of the dendrimer and the polarity of solvents having huge influences in the supramolecular self-assembly mechanism. What is more, the thermal stability, rheological properties, and network architecture information have also been investigated via tube-inversion, rotational rheometer, and powder X-ray diffraction methods, the results of which confirm the two different gel formation mechanisms that make POSS-ASP to exhibit two totally different thermal and mechanical properties. Such a study reports a new gelation system in organic or organic/aqueous mixed solvents, which can be helpful for investigating the relationship of dendritic supramolecular gelation and different polarity solvents during the supramolecular self-assembly process of gelators.
Co-reporter:Si Chen, Zhihang An, Xiaoqian Tong, Yining Chen, Meng Ma, Yanqin Shi, and Xu Wang
Langmuir December 19, 2017 Volume 33(Issue 50) pp:14389-14389
Publication Date(Web):November 26, 2017
DOI:10.1021/acs.langmuir.7b03873
The benzene ring of low-molecular-weight gelators provides strong intermolecular forces but increases molecular spacing during self-assembly. To explore both of the above influences on the gel properties, we synthesize two gelators (Glu-CBZ and Glu-DPA) consisting of the same terminal long side chain but different aliphatic functional groups. The aliphatic functional groups are carbobenzoxy group and diphenyl phosphate group. The self-assembly driving forces, self-organization patterns, network morphologies, rheological properties, and the influences of solvents are researched through 1H NMR spectra, Fourier transform infrared spectra, field-emission scanning electron microscopy images, rheological characterizations curves, tube-inversion experiment, and calculation of van’t Hoff plots. The results show that the carbobenzoxy group of Glu-CBZ makes molecules pack more tightly such that it improves the gel properties during static equilibrium. Whereas the diphenyl phosphate group of Glu-DPA provides stronger intermolecular forces, performing outstandingly during dynamic equilibrium. It is advantageous to further investigate the competitive relationship in gel system between the increased number of functional groups and the consequent steric effect.
Co-reporter:Meng Ma, Zhengdong Zhu, Bozhen Wu, Si Chen, Yanqin Shi, Xu Wang
Materials Letters 2017 Volume 190(Volume 190) pp:
Publication Date(Web):1 March 2017
DOI:10.1016/j.matlet.2016.12.140
•PA6/RGO composites were prepared via solution mixing and hot compressing.•The conductivity of PA6/RGO composites as electrical percolation systems was fully investigated.•PA6/RGO composites exhibit outstanding electrical properties owning to segregated structure.Polyamide-6 microspheres were synthesized via in-situ anionic ring-opening of caprolactam (CL). Subsequently, high-performance conductive composites based on reduced graphene oxide (RGO) and polyamide-6 (PA6) were prepared via solution mixing and hot compression molding. The study was carried out with two different reduction methods of graphene oxide (in situ thermal reduction and chemical reduction). The materials present outstanding electrical properties own to the successful creation of the segregated structure.We developed a facile pathway to prepare highly conductive composites based on polyamide-6 and reduced graphene sheets. The composites exhibit outstanding electrical properties including extremely low percolation threshold and high conductivity, which owns to the segregated structure construct inside of the composites.Download high-res image (86KB)Download full-size image
Co-reporter:Huiwen He, Si Chen, Xiaoqian Tong, Yining Chen, Bozhen Wu, Meng Ma, Xiaosong Wang and Xu Wang
Soft Matter 2016 vol. 12(Issue 3) pp:957-964
Publication Date(Web):30 Oct 2015
DOI:10.1039/C5SM02269J
Super strong and fast-recovery organic/inorganic hybrid gold nanoparticle (AuNPs)-supramolecular gels based on a three-dimensional loofah-like nanoscale network self-assembled by polyhedral oligomeric silsesquioxane (POSS) core supramolecular gelators are reported for the first time. Two series of POSS core organic/inorganic hybrid gelators, POSS-BOC-L-Homophenylalanine (POSS-Hpy) and POSS-Boc-Cys(Bzl)-OH (POSS-Cys), with two types of peripherals having different abilities for driving the self-assembly of AuNPs in gels were designed and synthesized, both of which self-assembled into three-dimensional loofah-like nanoscale gel networks producing hybrid physical gels with fast-recovery behaviors. The mechanical properties of the resultant hybrid gels were dramatically increased by as much as 100 times in the system of sulfur containing POSS-Cys gelators without destroying the fast-recovery behaviors, with the addition of AuNPs, which had direct interaction with AuNPs to give S–Au non-covalent driving force to lead AuNPs self-assemble onto the 3D loofah-like network nanofibres in the supramolecular hybrid gel system. However, in the POSS-Hpy gelator system without sulfur, no strong interaction with AuNPs existed and the POSS-Hpy nanocomposites showed no clear changes in morphology, thermal stability or rheological properties, confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), tube-inversion and rotational rheometer measurements. This indicated that the organic/inorganic hybrid gelator POSS-Cys could be applied to the formation of soft materials in which AuNPs were self-assembled and closely arranged into three-dimensional nanoscale networks. This hybrid material has great potential for applications in self-recovery, nano- and micron-scale electronic devices, because it has both a large mechanical strength and a fast-recovery capability.
Co-reporter:Huiwen He, Si Chen, Jun Bai, Haiming Zheng, Bozhen Wu, Meng Ma, Yanqin Shi and Xu Wang
RSC Advances 2016 vol. 6(Issue 41) pp:34685-34691
Publication Date(Web):22 Mar 2016
DOI:10.1039/C6RA02723G
Novel types of transparent PMMA composites were toughened with 3D loofah-like gel networks obtained via the in situ polymerization of methyl methacrylate (MMA) gel with POSS-based supramolecular POSS-Lys(BOC) gelators that have excellent compatibility with the polymerized matrix for the nanoscale nature of supramolecular gel fibers. The “gel networks-energy dissipation” toughening mechanism was investigated using SEM, tensile testing and DMA, the results of which demonstrate that a favorable architecture formed by the gel nanofibres through hydrogen bonding interactions contributes to the toughness improvement in these nanocomposites. In particular, UV-Vis spectrometry and haze meter tests indicate that the PMMA nanocomposites maintain the advantage of good optical transparency. In addition, the physical self-assembly nature of the gel networks allows them to be easily extracted from the polymer matrix, the result of which clearly demonstrates the framework formed by the nanofibres has not only been retained during the in situ polymerization process, but also has an outstanding capacity for the dissipation of energy. As a result, a special type of nanoporous materials with stable pore shapes was obtained, which has potential applications in optical sensors, energy storage and as a Li-ion battery separator.
Co-reporter:Meng Ma;Haiming Zheng;Si Chen;Bozhen Wu;Huiwen He;Liqing Chen
Polymer International 2016 Volume 65( Issue 10) pp:
Publication Date(Web):
DOI:10.1002/pi.5174
Abstract
Super-toughened poly(l-lactic acid) (PLLA) was prepared by reactive blending of PLLA with poly(ϵ-caprolactone) (PCL), glycerol and 4,4′-methylenediphenyl diisocyanate. The reactive interfacial compatibility between PLLA and the formed crosslinked polyurethane (CPU) in the PLLA matrix was studied in detail. The morphology and the toughness of the blends can be tuned by changing the CPU content. The results indicate that the impact strength of PLLA shows a tendency to higher values with the increasing PCL content up to 20 wt%. The notched impact strength of the blend with 20 wt% PCL increases to 55.01 kJ m−2, which is 24.9 times higher than that of neat PLLA. The elongation at break is also increased from 5% to 139.4%, indicating the brittle − ductile transition. The increased interfacial binding strength through the reactive interfacial compatibility and the formation of a CPU network in the PLLA matrix account for the improved toughness of PLLA/CPU blends. Dynamic mechanical analysis results indicate that the compatibility between PLLA and CPU is improved with increasing CPU content resulting in the formation of more interfacial phase. In addition, rheological property measurements indicate that the improvement in storage modulus and complex viscosity is ascribed to the formation of a CPU network in the PLLA matrix. © 2016 Society of Chemical Industry
Co-reporter:Si Chen, Xiao Luo, Huiwen He, Xiaoqian Tong, Bozhen Wu, Meng Ma and Xu Wang
Journal of Materials Chemistry A 2015 vol. 3(Issue 46) pp:12026-12031
Publication Date(Web):14 Oct 2015
DOI:10.1039/C5TC02196K
A unique stretchable liquid crystal light scattering display is reported in this paper with clear images shown at a maximum strain of 145% of the original length, based on super strong liquid crystalline physical gels with special loofah-like 3D gel networks.
Co-reporter:Si Chen, Huiwen He, Guodong Tang, Bozhen Wu, Meng Ma, Yanqin Shi and Xu Wang
RSC Advances 2015 vol. 5(Issue 123) pp:101437-101443
Publication Date(Web):09 Nov 2015
DOI:10.1039/C5RA17991B
The influence of a minor modification of the topological structure of a gelator’s core on the mechanism of the gel formation process and the resultant gel properties were researched by comparing the gelation ability of three L-lysine based gelators with the same arm structures and totally different topological core structures, one of which has a cubic topological polyhedral oligomeric silsesquioxane (POSS) core, one has a regular tetrahedron topological pentaerythritol core and the other has an organic linear topological dodecane core (denoted as POSS-Lys, PER-Lys and C12-Lys). Gelation tests, DSC, rheology measurements, SEM and POM investigations indicate that the gel obtained from C12-Lys with an organic linear topological dodecane core in the same solvent has a much greater strength of hydrogen bonding formed between the gelator molecules and much higher mechanical strength. What is more, POSS-Lys with a cubic topological core has a rather strong recovery ability, while PER-Lys cannot form a gel in any of the solvents tested. The key effect of such an obvious difference is in the self-assembly mechanisms which are influenced by the topological structure of the gelators.
Co-reporter:Si Chen, Guodong Tang, Bozhen Wu, Meng Ma and Xu Wang
RSC Advances 2015 vol. 5(Issue 44) pp:35282-35290
Publication Date(Web):26 Mar 2015
DOI:10.1039/C4RA17339B
The key effect of the self-assembly mechanism of dendritic gelators is researched by a comprehensive investigation of the gelation behavior of L-lysine dendritic gelators with different structures of three generations in 20 different solvents. The solvents investigation, 1H NMR, tube inversion method, DSC, rheology, FTIR and rheological measurements show that the reported dendritic gelators self-assemble through the main driving force of hydrogen bonds and the second driving force of π–π stackings. So the key effect of the self-assembling mechanism is that these factors can influence the driving force of the self-assembly process. This is the reason that L-lysine dendritic gelators tend to gelate in solvents with low α and β parameter values, which have less influence on the formation of hydrogen bonds between the gelators. Higher generations provide a much greater hydrogen bond density in the gelators, which makes them have a higher gelation ability. The benzyl terminal groups provide the second driving force of π–π stacking, making the Bzl-Gly-Lys gelators have much stronger gelation ability. This research reports a comprehensive insight into the precise ways in which the solubility parameters of the solvents, the gelator generation and the terminal group effects can influence the self-assembly and gelation of dendritic gelators. Gaining this type of fundamental understanding is essential if the key effect of this important class of self-assembling soft materials is to be truly understood.
Co-reporter:Jianshe Bao;Si Chen;Bozhen Wu;Meng Ma;Yanqin Shi
Journal of Applied Polymer Science 2015 Volume 132( Issue 3) pp:
Publication Date(Web):
DOI:10.1002/app.41298
ABSTRACT
A system composed of surfactant and foam stabilizer is used in preparing porous superabsorbent resins (SARs) of poly(sodium acrylic acid) (PAA-Na), which is obtained by free-radical solution polymerization of partially neutralized acrylic acid with mechanical agitation of eggbeater. Different types of surfactant, including anionic surfactant sodium n-dodecyl benzene sulfate (SDBS), cationic surfactant cetyltrimethyl ammonium bromide, and nonionic surfactant alkylphenols poly(oxyethylene) (OP-10), are used as blowing agent to produce pores by mechanical agitation, and triethanolamine (TEA) is used to act as foam stabilizer agent. The results show that a synergistic effect of SDBS with TEA is obtained and the packing density is decreased, which could be proved by the clearly porous morphology, and the water absorbing capacity of SARs is enhanced. As a result, such method can get PAA-Na SARs without any organic solvents, which provides an environmentally beneficial way to prepare SARs for hygiene and biomedical products. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41298.
Co-reporter:Feng Ye, Si Chen, GuoDong Tang, Meng Ma, Xu Wang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 480() pp: 1-10
Publication Date(Web):
DOI:10.1016/j.colsurfa.2015.03.025
Co-reporter:Xiaopeng Xu, Si Chen, Wei Tang, Yingjun Qu, Xu Wang
Polymer Degradation and Stability 2014 Volume 99() pp:211-218
Publication Date(Web):January 2014
DOI:10.1016/j.polymdegradstab.2013.11.003
Basic zinc cyanurate (Zn3(C3N3O3)2·ZnO, represented as Zn3Cy2) was synthesized via a precipitation method, and investigated as a thermal stabilizer for poly(vinyl chloride) (PVC) by thermogravimetric analysis (TGA), Congo red test and discoloration test. The thermal stability of PVC was significantly enhanced with the addition of Zn3Cy2. Compared with zinc stearate (ZnSt2), it is observed a significant improvement that Zn3Cy2 could delay the “zinc burning” of PVC. This is attributed to the strong ability of the cyanurate anions in Zn3Cy2 to absorb the hydrogen chloride released by the degradation of PVC. Moreover, mixing Zn3Cy2 with calcium stearate (CaSt2) in different mass ratios greatly promoted the thermal stability of PVC. Excellent synergistic effects could be observed when CaSt2/Zn3Cy2 combined with some commercial auxiliary stabilizers. Addition of dibenzoylmethane (DBM) brought a remarkable increase in initial color for PVC containing CaSt2/Zn3Cy2 while epoxidized soybean oil (ESBO) could improve both initial color and long-term stability.
Co-reporter:Si Chen, Xiaopeng Xu, Jiahuan Zhang, Wei Tang, Yingjun Qu, Xu Wang
Polymer Degradation and Stability 2014 Volume 105() pp:178-184
Publication Date(Web):July 2014
DOI:10.1016/j.polymdegradstab.2014.04.003
Co-reporter:Feng Ye, Si Chen, GuoDong Tang, Xu Wang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2014 Volume 452() pp:165-172
Publication Date(Web):20 June 2014
DOI:10.1016/j.colsurfa.2014.03.084
•Two-component gelator based on the interaction between dendritic branch and diaminododecane.•The exchange of morphology between a 3D gel network and globular structure.•Self-assembly mechanism of two-component gelator.A two-component gelator (B1⋯C12⋯B1) based on interaction between dendritic branch (Branch1 (COOH)) and diaminododecane is designed and synthesized, and its self-assembly behavior in methyl methacrylate (MMA) is firstly investigated. It is interesting to find that the gel formation depends on the concentration and sonication during cooling of the B1⋯C12⋯B1/MMA solution. Sonication plays as a switch simulator for exchanging morphology between a 3D gel network and globular structure in a certain concentration range. Thermal stability, rheological properties, morphology and self-assembly mechanism of the gels were investigated with tube inversion methodology, Dynamic oscillatory measurement, SEM and FTIR, respectively. The results indicated that Sonication-induced-gel (S-gel) exhibits much higher gel–sol temperature, storage modulus and lower critical gelator concentration compared with Temperature-induced-gel (T-gel), while sonication could partially destroy the hydrogen bond network and benefit the formation of the organogels.Schematic diagram of the ultrasonic effects on the gelation process.
Co-reporter:Guobo Huang, Shuqu Wang, Ping’an Song, Chenglin Wu, Suqing Chen, Xu Wang
Composites Part A: Applied Science and Manufacturing 2014 Volume 59() pp:18-25
Publication Date(Web):April 2014
DOI:10.1016/j.compositesa.2013.12.010
A novel polypropylene (PP) nanocomposite was fabricated by the incorporation of intumescent flame retardant (IFR), carbon nanotubes (CNTs) and graphene into the PP matrix. Results from TEM indicate that IFR, CNTs and exfoliated graphene nanosheets are dispersed finely in the PP matrix, which is supported by the XRD analysis results. Thermogravimetric (TGA) results show that the addition of IFR, CNTs and graphene improved the thermal stability and the char yields of PP. The PP/IFR/CNTs/RGO nanocomposites, filled with 18 wt% IFR, 1 wt% CNTs and 1 wt% graphene, achieve the limiting oxygen index value of 31.4% and UL-94 V0 grade. Cone calorimeter data reveal that combustion behavior, heat release rate peak (PHRR) and average specific extinction area (ASEA) of PP decrease substantially when combination effects of IFR, CNTs and graphene intervene. For the PP/IFR/CNTs/RGO nanocomposites, the PHRR exhibits an 83% reduction and the time of ignition is delayed 40 s compared with neat PP.
Co-reporter:Xiaopeng Xu, Si Chen, Wei Tang, Yingjun Qu, Xu Wang
Polymer Degradation and Stability 2013 Volume 98(Issue 2) pp:659-665
Publication Date(Web):February 2013
DOI:10.1016/j.polymdegradstab.2012.11.008
Novel uracil thermal stabilizers for rigid poly(vinyl chloride) (PVC), N, N-dimethyl-6-amino-uracil (DAU), N-monomethyl-6-amino-uracil (MAU) and N-monomethyl-6-amino-thiouracil (MATU) were synthesized successfully via a precipitation method, and characterized with 1H NMR spectra. Evaluation of these compounds as thermal stabilizer for rigid PVC was measured by discoloration test, and also using Haake torque rheometer and TGA. The results showed that, these novel uracil derivatives exhibited greater stabilizing efficiency compared with traditional Ca/Zn stabilizers (CZ) and diphenylthiourea (DTU) with the same concentration in PVC mixtures. This is attributed to the ability of these compounds to replace the labile chlorine atoms in PVC chains, and absorb of HCl released by the degradation of PVC, which was proved by the FTIR and 1H NMR spectral analysis. Furthermore, an excellent synergistic effect could be obtained when the model compound MATU combined with zinc stearate (ZnSt2) in different mass ratios, and the initial color and long-term stability of PVC products were remarkably improved.
Co-reporter:Li-Dan Fu;Si Chen;Yong-Jie Wang;Xiao-Dong Wang
Journal of Applied Polymer Science 2011 Volume 120( Issue 5) pp:2971-2978
Publication Date(Web):
DOI:10.1002/app.33344
Abstract
Polyamide 6 (PA6)/maleated ethylene–propylene–diene terpolymer rubber/nano calcium carbonate ternary composites were prepared. The effect of the compounding route on the morphology, toughness, and fracture behavior of the ternary composites were investigated by scanning electron microscopy, Charpy impact testing, and essential work of fracture (EWF) testing. The construction of sandbag microstructure particles in PA6 matrix was crucial to the toughness of the ternary composites. The Charpy impact strength and the specific essential work of fracture (we) of the ternary composites with a sandbag microstructure were 137.9 and 71.4% higher, respectively, than those of the ordinary ternary composites with a separated dispersion microstructure. The observation of the fracture surface after EWF testing indicated that the improvement of we was attributed to the sandbag microstructure particles; this structure was more effective for resisting the growth of cracks; meanwhile, the influence of the amount of fibrillation on the nonspecific essential work of fracture, including the nonspecific essential work of fracture before yielding and that in the necking–tearing stage, was insignificant. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Co-reporter:Xu Wang;Ke-Jie Xu;Xiang-Bin Xu;Soo-Jin Park;Seok Kim
Journal of Applied Polymer Science 2009 Volume 113( Issue 4) pp:2485-2491
Publication Date(Web):
DOI:10.1002/app.30078
Abstract
Ternary composite of nano-CaCO3/ethylene-propylene-diene terpolymer (EPDM)/polypropylene (PP) with high content of nano-CaCO3 was prepared by two step compounding route, in which EPDM and nano-CaCO3 were mixed first, and then melt compounding with PP matrix. The influence of mixing time during the second compounding on distribution of nano-CaCO3 particles and the impact strength of the ternary composite have been investigated. It was found that the Izod impact strength of composite decreased with increasing mixing time. The observation of transmission electron microscopy obviously showed that nano-CaCO3 particles transported from EPDM to PP matrix firstly and then from PP to the vicinity of EPDM dispersed phase with the increase of mixing time. This phenomenon can be well explained by the minimization of the dissipative energy and the Young's equation. The scanning electron microscope images show that lots of nano fibrils exist at the interface between nano-CaCO3 agglomerates and matrix, which can dissipate lots of energy. The toughening mechanism has been interpreted in terms of three-stage-mechanism: stress concentration, void and shear band formation, and induced shear yielding. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Co-reporter:Xu Wang;Jian Sun;Rui Huang
Journal of Applied Polymer Science 2006 Volume 99(Issue 5) pp:2268-2272
Publication Date(Web):9 DEC 2005
DOI:10.1002/app.22767
The influence of the compounding route of polypropylene (PP)/ethylene–propylene–diene terpolymer (EPDM)/nano-CaCO3 composites on their properties, including their mechanical properties, the dispersion degree of nano-CaCO3, and the morphology of EPDM, was studied. The results showed that the toughness of the composites and the morphology of the EPDM particles were markedly influenced by the compounding route, whereas the dispersion degree of nano-CaCO3 in the matrix was little influenced by the compounding route. The impact strength of composites prepared by one route was about 60 kJ/m2 with 20 wt % nano-CaCO3. The results indicated that a sandbag of nano-CaCO3 embedded in EPDM could effectively improve the toughness of the composites. A sandbag composed of EPDM and nano-CaCO3 eliminated the deterioration effect of the nano-CaCO3 agglomerate on the toughness of the composites, whereas the nano-CaCO3 agglomerate separately dispersed in PP decreased the toughness of the tercomponent composite © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006
Co-reporter:Guodong Tang, Si Chen, Feng Ye, Xiaopeng Xu, Jing Fang and Xu Wang
Chemical Communications 2014 - vol. 50(Issue 54) pp:NaN7183-7183
Publication Date(Web):2014/04/09
DOI:10.1039/C4CC01604A
We report a unique loofah-like gel network that is supported by the sectional type hexagonal columnar assembly of flexuous furcate fibers, which are constructed by plane-to-plane stacking of a novel 3D radially symmetrical gelator with POSS as the core and L-lysine as the arm.
Co-reporter:Si Chen, Xiao Luo, Huiwen He, Xiaoqian Tong, Bozhen Wu, Meng Ma and Xu Wang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 46) pp:NaN12031-12031
Publication Date(Web):2015/10/14
DOI:10.1039/C5TC02196K
A unique stretchable liquid crystal light scattering display is reported in this paper with clear images shown at a maximum strain of 145% of the original length, based on super strong liquid crystalline physical gels with special loofah-like 3D gel networks.
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