Citation: Ling-ling Zhang, Fei Gao, Can-feng Wang, Jian Zhang, Fa-rong Huang, Lei Du. SYNTHESIS AND CHARACTERIZATION OF POLY[(METHYLSILYLENE ETHYNYLENEPHENYLENEETHYNYLENE)-CO-(DIMETHYLSILYLENE ETHYNYLENEPHENYLENEETHYNYLENE)]S[J]. Chinese Journal of Polymer Science, ;2010, 28(2): 199-207. shu

SYNTHESIS AND CHARACTERIZATION OF POLY[(METHYLSILYLENE ETHYNYLENEPHENYLENEETHYNYLENE)-CO-(DIMETHYLSILYLENE ETHYNYLENEPHENYLENEETHYNYLENE)]S

Received Date: 5 January 2009
Revised Date: 4 March 2009

A series of poly[(methylsilylene ethynylenephenyleneethynylene)-co-(dimethylsilylene ethynylenephenylenee-thynylene)]s were synthesized by the incorporation of various ratios of methylsilylene to dimethylsilylene units into the polymer chain backbone. The resultant copolymers were soluble in a variety of common organic solvents at room temperature. The copolymers were characterized by FT-IR, 1H-NMR, GPC, rheological analysis, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results showed that the copolymers exhibited good processability and cured at low temperatures like 200°C. The curing reactions involved in hydrosilylation of Si―H and alkyne groups and the polymerization of alkynes. Td5 (5% weight loss) of the cured copolymers ranged from 629°C to 686°C, and the decomposition residues of cured copolymers at 1000°C ranged from 88.1% to 90.9% under nitrogen. Thermal stability of the copolymers increased with the introduction of methylsilylene units into polymer chains. The cured copolymers were sintered at 1450°C, and the results of X-ray diffraction analysis showed that β-SiC was formed in the sintered products.
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