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Reaction kinetics and network characterization of UV-curing polyester acrylate inorganic/organic hybrids

2007; Elsevier BV; Volume: 43; Issue: 8 Linguagem: Inglês

10.1016/j.eurpolymj.2007.05.035

1873-1945

Ahmet Nebioglu, Mark D. Soucek,

Advanced Polymer Synthesis and Characterization

Polyester acrylate inorganic/organic hybrids were prepared using a sol–gel precursor, coupling agent, and reactive diluent. The hybrids were cured via a UV-free radical initiator. Design of experiments (DOE) was utilized to investigate reaction kinetics and complex variable interactions. The effects of the silicate groups on the free radical photo-curing reaction kinetics were investigated utilizing a time-resolved Fourier transform infrared (FT–IR) spectroscopy and a differential scanning calorimeter equipped with a photocalorimetric accessory (photo-DSC). Microgel and inorganic network formation during the UV-initiated free radical crosslinking reactions was suggested to describe the complex gel-point behavior. It was proposed that the formation of the inorganic silicate groups retarded the organic crosslinking reactions. The UV-cured inorganic/organic hybrid films exhibited more homogeneous film morphology compared to the organic counterparts. In the hybrid films, a core–shell like inorganic/organic particle morphology was observed. The UV-crosslinked organic phase forms the core, whereas, the inorganic silicate forms the surrounding shell.