SYNTHESIS AND PROPERTIES OF PHOTOCURABLE POLYSILOXANES .4. POLYSILOXANES WITH PERFLUORO AND VINYLURETHANE GRAFTS

The copolycondensation of commercially available disilanols (PDMS), ha ving various molecular weights, with a fluorinated grafted triethoxysi lane and a vinyl grafted triethoxysilane led to the synthesis of a ser ies of polysiloxanes. These polysiloxanes were thus bearing fluorinate d grafts being linked to the silicone backbone through urethane groups . The structure of the final products was determined by IR, C-13 and H -1-NMR spectroscopies. The properties of these polymers at high and lo w temperatures are compared to those of PDMS and poly(methyltrifluorop ropyl)siloxane. These products exhibit very good release properties an d better properties the longer the silicone chain. (C) 1996 Elsevier S cience Ltd