Detail of "5505-72-6"

Reference

Crosslinking of hydrogen silicone elastomers with unsaturated organosilicon compounds by hydrosilylation

Crosslinking of hydrogen silicone elastomers with unsaturated organosilicon compounds by hydrosilylation. Gorshkov, A. V.; Kopylov, V. M.; Dontsov, A. A.; Khazen, L. Z. (USSR). Kauch. Rezina, (9), 5-7 (Russian) 1986. CODEN: KCRZAE. ISSN: 0022-9466. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Di-Me, Me hydrogen and di-Me, Me hydrogen, Me vinyl silicone rubbers (GSE-1 and -2, resp.) were vulcanized with or without vinyl group-contg. cyclosiloxanes, 1,3,5-trimethyl-1,3,5-trivinylcyclotrisilazane [5505-72-6], or linear siloxanes as vulcanizing agents in the presence of Pt bis(benzyltrioctylammonium) tetranitrite (I) [96109-38-5] at elevated temps. in air or under pressure. The crosslink d. increased with increasing concn. of I, cure temp., and time with or without vulcanizing agents; was higher in air than under pressure; and depended on Si substituents of vulcanizing agents, decreasing in the order: di-Me, Me vinyl siloxane > Me Ph, Me vinyl siloxane > di-Ph, Me vinyl siloxane. The crosslink d. of GSE-2 was substantially higher than that of GSE-1 under the same conditions. The highest rate of crosslinking was achieved with cyclosiloxane vulcanizing agents, such as 1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane [3901-77-7]. The degree of vulcanization in air increased on filling with colloidal SiO2 (Aerosil A-300) and was optimum with respect to physicomech. properties of vulcanizates when carried out at 200° for 60 and 120 min for GSE-1 and GSE-2, resp. The vulcanization in air proceeded via both hydrosilylation and oxidn. of HSi groups, followed by dehydrocondensation of SiOH groups.

Polymer derived Si-C-B-N ceramics via hydroboration from borazine derivatives and trivinylcyclotrisilazane

Polymer derived Si-C-B-N ceramics via hydroboration from borazine derivatives and trivinylcyclotrisilazane. Nghiem, Quoc Dat; Jeon, Jong-Kyu; Hong, Lan-Young; Kim, Dong-Pyo (Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Daejon 305-764, S. Korea). Journal of Organometallic Chemistry, 688(1-2), 27-35 (English) 2003 Elsevier Science B.V. CODEN: JORCAI. ISSN: 0022-328X. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 38 2,4,6-Trimethyl-2,4,6-trivinylcyclotrisilazane (VSZ) and borazine (B3N3H6) were used as starting materials to synthesize a preceramic polymer for a Si-C-B-N ceramic. The product was obtained as a sol. gel polymer by hydroboration between vinyl and B-H groups at 0°C to room temp. for 30 h by the std. Schenk technique. The polymer-to-ceramic conversion at a ceramic yield of 70-75% was investigated by simultaneous TG/DTA, 13C and 29Si MAS-NMR, IR, XRD, TEM and XPS. 5505-72-6 and 6569-51-3 are cas registry numbers of chemicals which are used as reagents here. The polymer-derived SiCBN ceramic remained as an amorphous solid up to 1400°C, and crystd. slightly at 1800°C to show mixed XRD patterns for Si3N4, SiC and BN. The ceramic product obtained at 1000-1400°C exhibited excellent oxidn. resistance in air. In addn., it was demonstrated that dense and smooth ceramic films were readily prepd. by spin-coating the liq. polymer. .