ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Free-radical polymerizations of five 2-silyl-substituted 1,3-butadienes, 2-trimethoxysilyl-1,3-butadiene (1), 2-triisopropoxysilyl-1,3-butadiene (2a), 2-[diisopropoxy(methyl)silyl]-1,3-buta-diene (2b), 2-[isopropoxy(dimethyl)silyl]-1,3-butadiene (2c), and 2-trimethylsilyl-1,3-butadiene (3), were carried out in bulk. Considerable amounts of Diels-Alder dimers as well as polymers were obtained at 80°C with AIBN as an initiator. Formation of the dimer was suppressed completely at 15°C with a redox type initiator, a combination of benzoyl peroxide and N,N-dimethylaniline. In these cases, the polymerization rates were extremely low, resulting in low polymer yield, at most 50%. The microstructures of the resulting polymers were predominantly E-1,4, regardless of the polymerization conditions and the substituents at the silicon atom. The results of copolymerizations of silyl-butadienes (M1) and styrene (M2) show that the former monomers have higher reactivity than the latter (r1 = 4,1 - 2,2;r2 = 0,4 - 0,5). The r1 values decrease with an increase in the number of methyl groups at the silicon atom.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1992.021930814
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