Effects of some phenylethynylsilicon compounds on heat‐curable silicone rubber. I. 1,3‐bis(methylphenylethynylvinyl)disiloxane

Abstract

Abstract We have investigated the effects of 1,3‐bis (methylphenylethynylvinyl) disiloxane (BMPVDS) as crosslinker on heat‐curable silicone rubber and measured sol fractions and crosslink density of vulcanizates by benzene‐extract and toluene‐swelling methods, respectively. The experimental results show that, adding suitable amounts of BMPVDS, the vulcanizates exhibited rather fine mechanical properties. The tear strength of some vulcanizates could reach as high as 60.31 kN/m, the tensile strength 13.46 MPa, and the modulus at 100% extension 2.45 MPa, and the permanent deformation is rather low. BMPVDS is also a good curing retarder of hydrosilation curing silicone rubber. When adding 0.08 part of BMPVDS or more, the stocks can store at 20 ± 1°C more than 50 days without curing.