The polydicyclopentadiene(PDCPD)/mesoporous molecular sieve SBA-15 composites were prepared by the methods of in situ polymerization and SBA-15 supported catalyst

in-situ polymerization.The mechanical performances of PDCPD/SBA-15 composites were studied.The reinforcing mechanism of mesoporous molecular sieve was investigated by XRD

TEM

TG

SEM

etc.The results showed that when the method of in situ polymerization was employed to prepare PDCPD/SBA-15 composites

the polymerization of dicyclopentadiene monomers was difficult to occur in the pores of SBA-15

causing that few molecular chains of PDCPD can form in the pores.The mechanical performances of composites improved weakly

compared with PDCPD

due to the weak interface compatibility between SBA-15 and PDCPD

and the conglomeration phenomenon of SBA-15 in PDCPD.The method of SBA-15 supported catalyst in situ polymerization is 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 surface and PDCPD molecular chains

prevent the conglomeration of SBA-15 particles in PDCPD

and enhance the tensile strength and heat-stability of composites greatly.Compared with PDCPD

the tensile strength of PDCPD/SBA-15 improves by 24.5% with 2% SBA-15 content.