SYNTHESIS AND APPLICATIONS OF PHOTOLINKABLE POLY(DIMETHYLSILOXANES) .2. SYNTHESIS OF POLYSILOXANE WITH URETHANE ACRYLATE GROUPS

We carried out the synthesis of poly(dimethylsiloxane) (PDMS) bearing acrylic groups linked to the chain by urethane moieties. Two methods were used. In the first we used silanes: (C2H5O)3Si-C3H6-NHCO2-C2H4-O2C-CH=CH2 with an acrylic group and three ethoxy groups which were able to react with alpha-omega-dihydroxy poly(dimethyl-siloxane): HO-[Si(CH3)2O-]n-H. In the second method we used PDMS on which hydroxyl groups were introduced in order to graft an acrylate compound with an isocyanate group: OC=N-empty set (CH3)-NH-CO2-C2H4-OCO-CH=CH2 In the last part of the work, we compare the release properties of our products spread on paper with two commercial products. We showed that, when the product contained less than 5% of curing group in the chain and a high molecular weight, the properties were the best.