Reference

Cationic polymerization of alkenylchlorosilanes

Cationic polymerization of alkenylchlorosilanes. Bieshev, Ya. Kh.; Farkhieva, I. T.; Monakov, Yu. B. 40934-74-5 and 53724-15-5 are also occured in this study.; Rafikov, S. R. (Inst. Khim., Ufa, USSR). Dokl. Akad. Nauk SSSR, 273(1), 119-22 [Phys. Chem.] (Russian) 1983. CODEN: DANKAS. ISSN: 0002-3264. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The cationic polymn. of alkenylchlorosilanes, e.g., cis-2-butenylmethyldichlorosilane (I) [53724-15-5], 3-methyl-2-butenylmethyldichlorosilane (II) [40934-74-5], 2-butenyltrichlorosilane (III) [18147-55-2], or vinyltrichlorosilane (IV) [75-94-5] at 298 K in the presence of a Gustavson complex proceeded very rapidly and was completed within 5 min after catalyst addn. The polymn. rate of the alkenylchlorosilanes decreased in the order: I x III > II > IV. Polymn. of alkenylchlorosilanes was characterized by high chain termination. Oligomeric alkenylchlorosilanes were viscous liqs. or powders sol. in CH2Cl2, but insol. in C7H16. A temporary polymn. mechanism was proposed. .

Molding compositions

Molding compositions. (Sumitomo Durez Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58176047 A2 15 Oct 1983 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: B22C001-02; B22C001-22; C08L061-06; C09J003-16. APPLICATION: JP 82-58039 9 Apr 1982. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Section cross-reference(s): 38, 55 Phenolic resin, polyisocyanate solns, and substances which give off HCl on hydrolysis are mixed to give the mold binders with amines as catalysts. The binders are esp. useful for alkali-contg. silica sand. Thus, regenerated sand (pH 10.7) 3000, PhOH-formaldehyde resin 45, and diphenylmethane diisocyanate [101-68-8] contg. vinyltrichlorosilane [75-94-5] 45 parts were mixed, shaped, and hardened with Et3N. The specimen compressive strength was 52.2 kg/cm2.