ISSN:
1572-8870
Keywords:
1,2-Bis(chlorodimethylsilyl(ethane
;
1,1,2,2-tetramethyl-1,2-disilacyclobutane
;
styrene
;
alkali metal vapors dehalogenation
;
ring-opening polymerization
;
polysilahydrocarbons
;
polycarbosilanes
;
heterochain polysilanes
;
polyethylenetetramethyldisilene
;
copolymerization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract l,l,2,2-Tetramethyl-l,2-disilacyclobutane (TMDSCB), obtained by alkali metal vapor dehalogenation of l,2-bis(chlorodimethylsilyl(ethane, undergoes room-temperature spontaneous ring-opening Copolymerization with styrene (St) and results in a rubbery copolymer (M w = 1.6 × 105, M w/M n = 4.4). In contrast to a thermoplastic homopolymer of TMDSCB (m.p. 110°C) that is obtained by the same procedure in the absence of styrene, the copolymer exhibits two-phase behavior (Tg = − 37°C, m.p. 106°C), with the heat of melting being considerably lower in the case of the copolymer (cf. 49.0 and 4.8 J g−1). Spectral and analytical data are consistent with a copolymer structure, [(Me2SiCH2CH2SiMe2) k (CH2CHPh)l] n , where k = 3, l = 1 (36%), and k = 6, l = 2 (64%).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022435822699
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