ChemInform Abstract: HYDROSILYLATION. RECENT ACHIEVEMENTS

Lukevics, É.; Belyakova, Z. V.; Pomerantseva, M. G.; Воронков, М. Г.

doi:10.1002/chin.197809351

Cited by 7 publications

(8 citation statements)

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“…Although reaction with MeSiC1 2 H gave a mixture of several products including the normal addition product, addition of trialkoxysilane proceeded normally. 7 An allyl alkylene-type olefin 4a does not have an electronegative group that can migrate to the platinum to cause propylene formation via the similar pathway to eq 6 or eq 7.…”

Section: (2) Measurement Of the Gas Evolved And Discussion On The Mecmentioning

confidence: 99%

Analysis of Effervescence during Hydrosilylation Curing

Iwahara

Kusakabe

Chiba

et al. 1993

Polym J

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ABSTRACT:In the novel hydrosilylation curing system, derived from an a,w-bis(2,4,6,8-tetramethylcyclotetrasiloxan-2-yl) carbon chain crosslinker 1 and allyl-group-end-blocked oligomer 2, effervescence phenomena during curing were examined. We found that the main component of the gas formed was propylene when 1 and 2 were heated in the presence of H 2 PtC16 for cure and that the amount of the gas was largely dependent on the structure of allyl functionality; in the system with allyl carbonate or allyl ester gas genaration was very distinctive and propylene formation was dominant well over the normal hydrosilylation.KEY WORDS Effervescence I Hydrosilylation Curing I Pt-Catalyst I a,w-bis(2,4,6,8-tetramethylcyclotetrasiloxan-2-yl) Carbon Chain Crosslinker I Allyl-Group-End-Blocked Oligomer I Propylene Formation IWe successfully applied the hydrosilylation reaction to the new organic-oligomer-based curing system as shown in Scheme 1. 1 -3 But effervescence still took place in some cases during curing in spite of the good miscibility of the two components, 1 and 2. The cured substances looked like foam with mechanicallyweakened strength. This paper describes the unexpected effervescence phenomenon from the polyhydrosiloxane-based hydrosilylation curing system and refers to the mechanism of gas formation. EXPERIMENTAL ReagentsCyclohydrotetrasiloxanes

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Section: (2) Measurement Of the Gas Evolved And Discussion On The Mecmentioning

confidence: 99%

Analysis of Effervescence during Hydrosilylation Curing

Iwahara

Kusakabe

Chiba

et al. 1993

Polym J

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“…The formation of ␣,␤ isomers in hydrosilylation. 27,28 POLY(PHOSPHONOSILOXANE) AND CYCLIC MONOMER SYNTHESIS the presence of Me 2 SO. Speier 21 suggested that the electron-donating ligands form a complex with the platinum moiety, thus displacing the -bonded olefin from the Pt complex.…”

Section: Synthesismentioning

confidence: 98%

“…[27][28][29][30] Thus, the hydrosilylation in the presence of chloroplatinic acid is reported to result in the ␤ isomer predominating (␣ : ␤ ϭ 35 : 65). When (Ph 3 P) 2 NiCl 2 is used as the catalyst, the ␣ isomer was reported 31 as the main product (ca.…”

Section: 28mentioning

confidence: 99%

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Synthesis of poly(phosphonosiloxane) and its cyclic monomer via hydrosilylation and phosphonylation of vinylbenzyl chloride

Song¹,

Cabasso²

1999

J. Polym. Sci. A Polym. Chem.

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“…alkylene and consequently the hydrosilylation reaction seems to proceed under controlled conditions. 6 …”

Section: Effects Of Allyl-substituent Structures Of 2 On the Shs Reacmentioning

confidence: 99%

Synthesis of New Organic Crosslinking Reagents Containing SiH Bonds and Curing System Thereof

Iwahara

Kusakabe

Chiba

et al. 1993

Polym J

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ABSTRACT:New organic crosslinking reagents 1 containing SiH bonds have been synthesized by platinum-catalyzed "Selective Hydrosilylation"(SHS) reaction of either 1,9-decadiene 2a or diallyl ether of bisphenol A 2b with 2,4,6,8-tetramethylcyclotetrasiloxane [CHiH)Si0]4 (3) (hereafter called hydrocyclotetrasiloxane) (eq I). Identification of the new crosslinking reagents 1 was well performed by 1 H NMR. The cyclic structure of the starting hydrocyclotetrasiloxane 3 was retained in the product 1 after the SHS reaction, as evidenced by 13 C NMR analysis. The storage stability of 1 was significantly influenced by the amount of Pt catalyst still remaining in it. It could get much better when a decreased amount of Pt catalyst was used for SHS reaction and benzothiazole was added. Curing system composed of la and allyloxy end-blocked poly(propylene oxide) 4a was examined. Curing ability of the system was found to be dependent on temperature, amount of the Pt catalyst employed, and the number of the SiH bond per molecule of la. Rubbery materials could be obtained in a short period of time.KEY WORDS Selective Hydrosilylation (SHS) / Pt-Catalyzed / HydroCylotetrasiloxane / NMR Analysis/ C-0 Bond Cleavage/ Storage Stability/ Curing System / Gel Time / Modulus / Gel Content Hydrosilylation reaction has been widely employed for curing ( crosslinking) of so-called addition-type polysiloxanes. Although this type of polysiloxanes has several excellent properties such as high curing rate at high temperature, good dimensional stability etc., application of this addition-type-curing technology to organic polymers or oligomers has been eventually limited (Scheme 1 ). One of the significant reasons is probably the poor compatibility of hydrogenpolysiloxanes with organic molecules, which leads to the serious problems. 1 We have thus considered to prepare various Curing system composed of a hydrogenpolysiloxane and C-C unsaturated-bond-containing oligomer.

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ChemInform Abstract: HYDROSILYLATION. RECENT ACHIEVEMENTS

Cited by 7 publications

References 0 publications

Analysis of Effervescence during Hydrosilylation Curing

Analysis of Effervescence during Hydrosilylation Curing

Synthesis of poly(phosphonosiloxane) and its cyclic monomer via hydrosilylation and phosphonylation of vinylbenzyl chloride

Synthesis of New Organic Crosslinking Reagents Containing SiH Bonds and Curing System Thereof

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