摘要:
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。
Abstract:
The mesoporous molecular sieve (SBA-15)/polydicyclopentadiene(PDCPD) composites were prepared by in-situ polymerization with SBA-15 supported catalyst (method 1), SBA-15 modified by coupling agent (method 2), modified SBA-15 supported catalyst (method 3), respectively. The effect of preparing methods on mechanical performances of SBA-15/PDCPD was investigated. The results show that for the SBA-15/PDCPD composites prepared by method 2, although modified SBA-15 can improve the interface interaction between SBA-15 and PDCPD matrix, the polymerization of dicyclopentadiene(DCPD) monomer is difficult to occur in the pores of SBA-15, causing the mechanical performances of composites improve weakly, compared with PDCPD. Method 1 and method 3 applied to prepare SBA-15/PDCPD composites are beneficial to the form of PDCPD molecular chains in the pores of SBA-15. The form of molecular chains in the pores can improve the interface interaction between SBA-15 and PDCPD matrix, enhancing the mechanical performances of composites greatly. Compared with PDCPD, the tensile strength and bending strength of SBA-15/PDCPD prepared by method 1 increase by 24.5% and 24% when the mass ratio of SBA-15/PDCPD is 2∶100, respectively. For the composites prepared by method 3, the quantity of PDCPD molecular chains formed in the pores of SBA-15 is smaller than that of method 1 due to the SBA-15 pores occupied by coupling agent molecule, resulting that the mechanical performances is lower than that of method 1, but higher than that of method 2.
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