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将负载催化剂的SBA-15型介孔分子筛(方法1)、偶联剂表面改性的SBA-15(方法2)、偶联剂表面改性后负载催化剂的SBA-15(方法3),采用原位聚合法分别制备了SBA-15/聚双环戊二烯(PDCPD)复合材料。研究了不同制备方法对SBA-15/PDCPD力学性能的影响。结果表明,对于方法2,虽然偶联剂改性SBA-15可提高与PDCPD界面作用力,但由于分子筛孔道中的双环戊二烯(DCPD)单体难以发生聚合反应,导致复合材料的力学性能较PDCPD没有明显改善。采用方法1及方法3可使PDCPD分子链在SBA-15孔道中生成,改善了PDCPD基体与SBA-15的界面作用力,使复合材料的力学性能明显改善。采用方法1,SBA-15/PDCPD质量比为2∶100时,复合材料拉伸强度较PDCPD提高了24.5%,弯曲强度提高了24%。采用方法3制备的复合材料中偶联剂分子占据了SBA-15孔道空间,导致孔道中生成聚合物分子链数量较方法1少,使其力学性能提高幅度低于方法1,但优于方法2。
The SBA-15 mesoporous molecular sieve loaded with catalyst (method 1), the SBA-15 with surface-modified coupling agent (method 2), the SBA-15 with the catalyst surface-modified with coupling agent (method 3) SBA-15 / poly dicyclopentadiene (PDCPD) composites were prepared by in-situ polymerization. The effects of different preparation methods on the mechanical properties of SBA-15 / PDCPD were studied. The results showed that although the coupling agent modified SBA-15 can improve the interaction with PDCPD, the dicyclopentadiene (DCPD) monomer in the molecular sieve pores is difficult to polymerize, resulting in the mechanical properties of the composites No significant improvement over PDCPD. The PDCPD molecular chains were formed in the SBA-15 pores by the methods 1 and 3, which improved the interfacial forces between the PDCPD matrix and SBA-15 and improved the mechanical properties of the composites. When using SBA-15 / PDCPD with mass ratio of 2: 100, the tensile strength of the composites increased by 24.5% and the bending strength by 24% compared with that of the PDCPD. In the composite prepared by the method 3, the coupling agent molecules occupy the SBA-15 pore space, resulting in fewer polymer molecules in the pores than the method 1, and the improvement in the mechanical properties is less than that of the method 1, but is superior to the method 2 .