Photochemistry of polymeric systems—VIII. Photo-crosslinking of polysiloxanes including cinnamic, furacrylic or α-cyano β-styrylacrylic ester groups: A comparative study☆

Add time:09/05/2019    Source:sciencedirect.com

Polysiloxane copolymers containing 2–25 mol% of methylhydrosiloxane units were functionalized by platinum catalyzed hydrosilylation of vinylsilyl terminated cinnamic, β-(2-furyl) acrylic acid α-cyano β-styryl acrylic esters. The modification affords liquid photo-crosslinkable polymers with practical sensitivity strongly dependent on the nature of the dimerizable ester, the starting polymer chain length and the functionalization rate. Besides the influence of these three basic parameters, branching side-reactions during the hydrosilylation interestingly enhanced the photosensitivity of the obtained polymers but had to be controlled in order to preserve sufficient flow-properties for solvent-free coating applications.

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