CROSS-LINKING COPOLYMERIZATION OF CYCLIC KETENACETALS

The crosslinking copolymerization of two 9-substituted 4-methylene-3,5 ,8,10-tetraoxabicyclo[5.3.0]decanes (1 and 2) with 9-dimethylene-2,4,8 ,10-tetraoxa-spiro[5.5]undecane (3) or ethylene glycol dimethacrylate (4) was investigated. Dependent on the amount of bifunctional agent ad ded, the material properties can be controlled and change from highly viscous to mechanically hard, as the extent of crosslinking increases. Combined with bicyclic monomers, the influence of the crosslinkers on the polymerization shrinkage is low.