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大分子偶联剂的合成及其对SiO2/三元乙丙橡胶复合材料性能的影响

Synthesis of macromolecular coupling agent and its effects on properties of SiO2/ethylene-propylene-diene monomer composites

    摘要
  • 摘要: 为改善SiO2在三元乙丙橡胶(EPDM)复合材料中的分散性并获得良好界面性能, 通过传统自由基聚合法合成了一系列不同接枝率的大分子偶联剂, 即EPDM、甲基丙烯酸甲酯(MMA)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)的三元共聚物。采用不同接枝率的大分子偶联剂对SiO2/EPDM复合材料进行改性。通过FTIR、1H-NMR、TGA、DMA和SEM对三元共聚物的结构和SiO2/EPDM复合材料的性能进行研究。结果表明:添加了大分子偶联剂的SiO2/EPDM复合材料的相容性得到了显著改善, 拉伸强度和撕裂强度比未经偶联剂处理的SiO2/EPDM复合材料分别提高了109.4%和44.0%;SiO2表面改性后的SiO2/EPDM复合材料的储能模量和玻璃化转变温度有所升高。

     

    Abstract: To obtain good dispersion and interface properties of SiO2 in ethylene-propylene-diene monomer (EPDM) composites, a series of macromolecular coupling agents with different grafting ratios were synthesized by conventional free radical polymerization, that is EPDM, methyl methacrylate (MMA) and γ-methacryloxypropyltrimethoxy silane (KH-570) terpolymer. The macromolecular coupling agents with different grafting ratios were used to modify SiO2/EPDM composites. FTIR, 1H-NMR, TGA, DMA and SEM were used to characterize the structure of terpolymer and properties of SiO2/EPDM composites. The results show that the compatibility of SiO2/EPDM composites is improved significantly after SiO2 surface treated by macromolecular coupling agent. The tensile and tear strength of SiO2/EPDM composites is increased up to 109.4% and 44.0% respectively when comparing with the composites without coupling agent. The storage modulus and glass transition temperature of SiO2/EPDM composites have been increased after SiO2 surface treatment.

     

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