HongMei Zhang

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Name: 张红梅; HongMei Zhang

Organization: Shanghai Jiaotong University , China

Department: State Key Laboratory of Metal Matrix composites

Title: Lecturer(PhD)

TOPICS

Polymer

Chemicals
References

Preparation and properties of styrene-butadiene rubber nanocomposites blended with carbon black-graphene hybrid filler

Co-reporter:Hongmei Zhang;Chunwei Wang ;Yong Zhang

Journal of Applied Polymer Science 2015 Volume 132( Issue 3) pp:

Publication Date(Web):

DOI:10.1002/app.41309

ABSTRACT

Graphene has become an attractive reinforcing filler for rubber materials, but its dispersion in rubber is still a big challenge. In this work, a novel carbon black-reduced graphene (CB-RG) hybrid filler was fabricated and blended with styrene-butadiene rubber (SBR) via simple two-roll mill mixing. The prepared CB-RG hybrids had a microstructure with small CB agglomerates adsorbed onto graphene surfaces. CB acted as a barrier preventing the RG sheets from restacking even after drying. Homogeneous dispersion of graphene sheets in SBR matrix was observed by the mechanical mixing method based on the application of the CB-RG hybrid fillers. Dynamic mechanical analysis showed that Tg of the SBR/CB-RG blend was higher than that of the SBR/CB blend indicating strong interfacial interactions between RG and SBR due to the high surface area of graphene and the π-π interaction between SBR and graphene. The tensile properties of SBR/CB-RG composites improved significantly and the volume resistivity decreased compared with the SBR/CB blends. The thermal stability of SBR composites filled with CB and CB-RG showed slight difference. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41309.

Synergistic effects of rare earth oxides on intumescent flame retardancy of Nylon 1010/ethylene-vinyl-acetate rubber thermoplastic elastomers

Co-reporter:Hongmei Zhang;Xianbo Lu;Yong Zhang

Journal of Polymer Research 2015 Volume 22( Issue 2) pp:

Publication Date(Web):2015 February

DOI:10.1007/s10965-014-0652-8

Synergistic effects of two kinds of rare earth oxides (REOs), samarium oxide (Sm2O3) or lanthanum oxide (La2O3) on the intumescent flame retardancy of Nylon 1010/ethylene-vinyl-acetate rubber (EVM) thermoplastic elastomers (TPE) were studied systemically. The limiting oxygen index (LOI) of intumescence flame retardant (IFR)-TPE increased from 30.5 to 32.5 and 34 when 0.5 wt% of IFR was substituted by La2O3 and Sm2O3, respectively. Sm2O3 showed higher synergistic effectivity than La2O3. Cone calorimetry tests confirmed that REOs enhanced flame retardancy of IFR-TPE. Smoke and CO production rate slightly decreased after incorporation of REOs as compared to IFR-TPEs without REOs, indicating relatively reduced combustion hazard. By thermalgravimetric analyses (TGA), it was found that the presence of REOs promoted the esterification and carbonization process in low-temperature range while enhanced the thermal stability of IFR and IFR-TPEs in high-temperature range. X-ray diffraction (XRD) proved that the interaction of Sm2O3 with IFR resulted in the formation of samarium phosphate (SmPO4) with high-thermal stability. Rheological measurements showed that the complex viscosities of the IFR-TPEs increased with the addition of REOs, which might aid in suppressing melt dripping. For mechanical properties, incorporation of REOs led to higher modulus, similar tensile strength but lower elongation at break as compared to IFR-TPEs without REOs.