Effect of monomer structures and preparation methods on the morphology and properties of UV cured organic-inorganic hybrid films

摘要

The effects of preparation methods and monomer chemical structures on the microstructure, morphology, and properties of the hybrid films were studied. 7DBPA-3S was synthesized by the sol-gel reaction of precondensed. silica particles with alkoxysilane-modified polymers DBPA. DBP-POBG3T3 was prepared by the radiation curing of comb-like UV curable alkoxysilanes POBG3T3 with UV curable polymer DBP, followed by the sol-gel reaction of alkoxysilanes. The DBP-POBG3T3 film consisted of polymer matrix and large tethered aggregates with tiny silica connected by organic chains. On the contrary, silica nanoparticles were well-dispersed in the 7DBPA-3S hybrid film. The TEM, energy dispersive X-ray Si-mapping and P-mapping images are good experimental approaches to characterize the texture of the tethered aggregates. The 7DBPA-3S hybrid composite with well-dispersed silica nanoparticles exhibited smoother surface, higher transparency, and better thermal stability than the DBP-POBG3T3 composite did. (c) 2007 Wiley Periodicals, Inc.