Preparation And Characterization Of PDCPD/Nano-SiO₂ Composite

Polymer/Nano-SiO₂ was one of the most important brands of nano- composite in recent years. In this thesis, the complexes of W and phenol were supported on Nano- SiO₂ through the support of physics and chemical methods, and Polydicyclopentadiene (PDCPD)/Nano-SiO₂ composites were prepared through the supported catalyst. This thesis mainly works as follows:1. Two kinds of coupling agents of theγ-aminopropyl-ethyl-2-ethoxy silane(WD-57) and the vinyl trimethoxysilane(DB-171) were adopted to modify the surface of Nano-SiO₂ and analyzed by the infrared spectra. The difference between Nano- SiO₂ and modified Nano-SiO₂ was shown through it. Through ampule test, the effects of different coupling agents on the polymerization were compared, and investigated the parameters of catalyst amount, reaction temperature and Gel-time. The results showed that the catalyst activities of Nano-SiO₂ modified by WD-57 was better than DB-171, the monomer (DCPD)/W mole rate was 1200:1, the Et2AlCl/W mole rate was 20:1, the molding temperature was 80 Celsius degree.2. Two chemical supported methods were used: (1)The special phenol was bonded to Nano-SiO₂ through chemical method, and the macromolecular ligands were synthesized, which reacted with WCl6 to generate a new supported catalyst W and phenol complexes. (2)In the presence of the catalyst, the supported catalyst that was bonded tungsten atoms with Si-O bond was synthesized by reacting of Nano-SiO₂ and the complexes of W and phenol. The products were characterized by IR, SEM and TGA, et al. The results showed that two new supported catalyst was successfully prepared through chemical method.3. Further enlarged polymer tests of DCPD were made through self-made RIM simulating device and the preparation parameters of nanocomposites were studied according to the result of the former small amount ampule test. Then the PDCPD/ Nano-SiO₂ composites were prepared through the supported catalysts and the alkyl aluminum cocatalyst. The products were characterized by SEM and TGA et al. Mechanical property was also measured by Electronic Universal Material Testing Machine and impact tester. The results showed that the PDCPD/Nano-SiO₂ composites were successfully synthesized by the support of physical and chemical methods. Tensile strength of composites raised from 32.63MPa to 48.16MPa, and the impact property descended. The thermal stability of the PDCPD/Nano-SiO₂ composites were better than pure PDCPD.