SYNTHESIS, CHARACTERIZATION AND THIOL-ENE POLYMERIZATION OF HYDROLYZED CONDENSED NORBORNENYL SILIC ACID ESTER/

Bicyclo[2.2.1]hept-2-ene-5-yl (norborn-2-ene-5-yl) derivatives of sili c acid were synthesized by the Diels-Alder reaction of the correspondi ng (meth)acryloxypropyl silanes with cyclopentadiene monomer. The norb ornenyl silanes were characterized by elemental analyses, IR, H-1 NMR, C-13 NMR and Si-29 NMR spectroscopy. The hydrolysis and condensation of norbornene-funktionalized silic acid esters yield polysiloxanes whi ch can be crosslinked by the photoinitiated reaction with multifunctio nal thiols. The shrinking behaviour of the bulk materials which are ob tained by this combination of the sol-gel process with the thiol-ene p olymerization were investigated.