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Yang Z.,Nanjing University | Zhou C.,Nanjing University | Yang H.,Nanjing University | Cai T.,Nanjing University | And 6 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

The partially sulfonated polystyrene (SPS) is a very simple and easily prepared material. In this work, SPS was used for the first time as a macromolecular compatibilizer to improve the compatibilization of high-impact polystyrene (HIPS)/ magnesium hydroxide (MH) composites by self- compatibilization technology. The compatibilization effects of SPS were systematically studied by mechanical performance tests, limiting oxygen index (LOI) measurements, thermal stability analyses, and scanning electron microscopy (SEM) observation. On the basis of these experimental results, SPS was proven efficient to enhance the compatibilization of the HIPS/MH composites due to the coupling effects. The sulfonic groups of SPS could anchor onto the surface of MH particles through interaction with hydroxyl groups of MH. Meanwhile, the long alkyl chains of SPS readily entwisted with HIPS matrix. Besides, the effects of both the sulfonation degree and the content of SPS on the performance of HIPS/MH composites were investigated also. In order to obtain the best overall final performance, both of the aforementioned parameters should be controlled in a suitable range. The optimal condition in this study was 3-4.5 wt % of SPS with sulfonation degree of 24.8-35.5% in the composites. Furthermore, compared with styrene-butadiene-styrene block copolymer (SBS), a commercial compatibilizer widely used in HIPS materials, SPS exhibited better compatibilization effects but lower cost. Therefore, it could be concluded that SPS was applicable as a cost-effective compatibilizer in HIPS/MH composites. © 2012 American Chemical Society.

Yang Z.,Nanjing University | Zhou C.,Nanjing University | Zhou D.,Nanjing Dingfeng Plastic Ltd Company | Chen B.,Nanjing Dingfeng Plastic Ltd Company | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2010

Linear low density polyethylene (LLDPE)-Mg (OH) 2composites were prepared by a two-step method, in which a kind of commercial Mg(OH)2 was used as flame retardant and LLDPE as polymer matrix. Effects of five different silane coupling agents on properties of the composites were investigated according to molecular structures of the surface modifiers. The experimental results indicated that both particle sizes and their distribution of Mg(OH)2 increased after being modified with various silane coupling agents. However, composites modified by KH-560 (γ-(2,3-epoxypropoxy) propyl trimethoxysilane) coupling agent possessed the best mechanical properties and thermal stability, which was ascribed to that the epoxy groups on long hydrophobic chains in KH-560 coupling agent molecules efficiently enhanced the compatibility between the Mg(OH)2 and the polymer matrix. Furthermore, investigation of the composite morphology by means of SEM confirmed that the composites modified by KH-560 coupling agent showed the best compatibility and the best dispersibility of Mg(OH) 2 in LLDPE.

Yang Z.,Key Laboratory for Mesoscopic Chemistry of MOE | Cai J.,Key Laboratory for Mesoscopic Chemistry of MOE | Zhou C.,Key Laboratory for Mesoscopic Chemistry of MOE | Zhou D.,Nanjing Dingfeng Plastic Ltd Company | And 3 more authors.
Journal of Applied Polymer Science | Year: 2010

Based on traditional idea of molecular coupling effect, surface modifiers were helpful to improve the performances of inorganic/organic composites. However, it was also widely accepted that the content of surface modifier should be controlled in a suitable range, and more or less modifiers could not reach to optimal properties. The intrinsic reason for this phenomenon was not clear until now. In this article, the influences of the content of surface modifier: silane coupling agent KH-560, on the final performances of linear low-density polyethylene (LLDPE)/magnesium hydroxide (MH) composites, have been studied. The performance tests of LLDPE/MH composites, including mechanical properties measurements, thermal oxidative stability analysis, and surface morphology observation, all confirmed that there was an optimal content range of surface modifier. However, further morphology investigation of the modified MH by particle size and particle size distribution analyzer showed that, the particle size and particle size distribution of MH both increased as the content of KH-560 increased. ATR-FTIR analysis proved that silane grafting was achieved on the MH particle surface, which not only improved the compatibility between MH and LLDPE for molecular coupling effect, but also caused bigger particle size and wider particle size distribution, which were disadvantageous to improve the performances of the composites. The two opposite effects of the surface modifiers mentioned above affected the final performances of the composites. © 2010 Wiley Periodicals.

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