Abstract
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. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1152–1165, 2007
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