原位生成SiO_2杂化改性胶粉及在PP中的应用研究

In-situ SiO_2 Hybrid Modification of Rubber Powder and Its Application in PP

通过溶胶-凝胶法（Sol-Gel）在胶粉中原位生成纳米SiO2网络，利用傅立叶红外光谱（FF-IR）等证明了在胶粉硫化网络中存在-Si-O-Si-网络结构；将改性胶粉（SRP）应用于聚丙烯（PP）中，考察了反应前驱体用量对PP／SRP复合材料力学性能、热性能等的影响。研究发现，PP／SRP复合材料的抗冲击强度比PP、PP／RP的提高了1．5—2．5倍，结晶熔融温度比PP／RP、PP／URP的提高了2～3℃左右；并用扫描电子显微镜分析了以上体系的微观结构。

In-situ SiO2 modified robber powder （SRP） was prepared by sol-gel method and analyzed by means of FTIR. The results indicated there was -Si-O-Si- network generated in the internal transition zone of RP. The PP/SRP （100/100） composites were prepared by mixing method, and the effect of the content of precursor Na2SiO3 on the mechanical and thermal properties of PP/SRP were studied. The results showed the Izod Impact strength of PP/SRP composite was 1.5-2.5 times higher than those of PP and PP/tlP composite, and the crystalline melting temperature of the composite was 2 - 3 ℃ higher than those of PP/RP and PP/URP. Finally, the microstructures of PP/URP and PP/SRP were analyzed by means of SEM.