星形硅烷大分子偶联剂的合成及其对聚苯乙烯复合材料的影响

Synthesis of Star Macromolecular Coupling Agent and Its Impact on Polystyrene Composites

以季戊四醇和α-溴代异丁酰溴反应产物为星形引发剂,通过原子转移自由基聚合方法引发苯乙烯(St)、甲基丙烯酸丁酯(BMA)和3-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)反应,制备了星形大分子偶联剂。通过红外光谱、核磁共振和凝胶渗透色谱对大分子偶联剂的结构和组成进行了表征。对比研究了星形大分子偶联剂相对分子质量对聚苯乙烯/二氧化硅(PS/Si O2)复合材料性能的影响。结果表明,包含星形大分子偶联剂的复合材料的相容性及力学性能得到显著改善,随着星形大分子偶联剂相对分子质量的增加,PS/Si O2复合材料的玻璃化转变温度逐渐升高,冲击强度比未经偶联剂处理过的复合材料提高了近50%。

The star initiator was synthesized by the reaction between pentaerythritol and 2-bromoisobutyryl bromide.The serial star macromolecular coupling agents with well-defined structures were prepared successfully by atom transfer radical polymerization( ATRP) of styrene( St),butyl methacrylate( BMA) and 3-methoxyacryloyl-propyltrimethoxyl silicon( KH-570). The structures and compositions of macromolecular coupling agents were characterized by infrared spectrum( FT-IR),nuclear magnetic resonance spectroscopy(1H-NMR) and gel permeation chromatography( GPC).And their effects on the polystyrene / silica( PS / Si O2) composite were studied. The results show that the interface compatibility and mechanical properties of composite containing star macromolecule coupling agents are improved significantly. The impact strength is increased by 50% when comparing with composites which contain micromolecular coupling agents.