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Pd-catalyzed hydrosilylation polymerization of a dihydrosilane with diyne/triyne mixed systems affording crosslinked silylene–divinylene polymers and their properties
Treatment of a dihydrosilane (methylphenylsilane, 1) with mixtures of a diyne ( p- or m-diethynylbenzene, 2a or 2b) and a triyne (1,3,5-triethynylbenzene, 3a or B, B′, B″-triethynyl- N, N′, N″-trimethylborazine, 3b; 1: 2: 3=100:95:5, 100:90:10, 100:80:20) in the presence of Pd–PCy 3 (Cy=cyclohexyl)...
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Published in: | Polymer (Guilford) 2005-11, Vol.46 (23), p.9736-9741 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Treatment of a dihydrosilane (methylphenylsilane,
1) with mixtures of a diyne (
p- or
m-diethynylbenzene,
2a or
2b) and a triyne (1,3,5-triethynylbenzene,
3a or
B,
B′,
B″-triethynyl-
N,
N′,
N″-trimethylborazine,
3b;
1:
2:
3=100:95:5, 100:90:10, 100:80:20) in the presence of Pd–PCy
3 (Cy=cyclohexyl) catalyst gave new crosslinked silylenedivinylene polycarbosilanes. In TGA the resulting crosslinked polymers tended to show higher Td
5 values and higher char yields than the corresponding linear polymers. On the other hand, UV/vis absorption spectra of the crosslinked polymers obtained in the reactions of
2a or
2b with
3a exhibited increased broad peaks around 390
nm for
2a or 360
nm for
2b. Coincidently, their fluorescence spectra showed significant increase of the emission peaks in 400–550
nm. The crosslinked polymer derived from
2a and
3b, however, showed decrease of the absorption peak around 390
nm and profound depression of fluorescence peaks in 400–550
nm. |
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ISSN: | 0032-3861 1873-2291 |
DOI: | 10.1016/j.polymer.2005.08.052 |