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A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

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Abstract

A new method was developed for the metal-free cross-linking of silicone rubbers. This process uses azobisisobutyronitrile (AIBN) to selectively react with Si–H and vinyl groups as a free-radical initiator for the thermal curing of polymethylhydrosiloxane (PMHS) and polymethylvinylsiloxane (PMVS). The AIBN-initiated curing reaction between the Si–H groups of PMHS generated Si–O–Si and Si–Si cross-links. In contrast, PMVS was cured via the formation of C–C bonds through “methyl–vinyl” and “vinyl–vinyl” mechanisms. Curing reactions were performed at 80–120 °C in air and confirmed by 13C and 29Si solid state NMR analyses and swelling trials.

Graphical abstract: A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

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Article information


Submitted
20 Mar 2020
Accepted
18 Jun 2020
First published
19 Jun 2020

Dalton Trans., 2020, Advance Article
Article type
Communication

A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

K. V. Deriabin, M. V. Dobrynin and R. M. Islamova, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01061H

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