Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-07-04

Journal: DESIGNED MONOMERS AND POLYMERS

Included Journals: Scopus、EI、SCIE

Volume: 18

Issue: 5

Page Number: 479-485

ISSN: 1385-772X

Key Words: 1,1-diphenylethylene derivatives; thermal properties; ceramic precursor; functionalized polycarbosilane oligomers; hydrosilylation polymerization

Abstract: Polycarbosilanes were prepared via hydrosilylation polymerization of functional 1,1-diphenylethylene (DPE) derivatives (dimethyl-[4-(1-phenylvinyl)phenyl]silane (DPE-SiH) and 1-(4-methyloxyphenyl)-1 '-(4-dimethylsilanephenyl) ethylene (DPE-SiH/OMe)). Both DPE-SiH and DPE-SiH/OMe were synthesized as monomers and then utilized to prepare corresponding oligomers with Si-C bonds and phenyl rings in their backbones. The DPs were calculated to be 5.9 and 6.3, respectively, while the beta-additions were 88.8 and 88.0%. The Td(5) of DPE-SiH and DPE-SiH/OMe oligomers were 270 and 345 degrees C, respectively, and their weight residue was approximately 20% even heated at a temperature near 1200 degrees C in nitrogen. The compact tiny pores distributed on cross section of the resultant SiC ceramics were observed with the scanning electron microscopy. The thermal analyses verified that the oligomers of DPE-SiH and DPE-SiH/OMe possessed favorable thermal stabilities and could be taken as the proper PCSs precursor for preparation of SiC ceramic materials.