Reaction kinetics and network characterization of UV-curing polyester acrylate inorganic/organic hybrids
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...
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Veröffentlicht in: | European polymer journal 2007-08, Vol.43 (8), p.3325-3336 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0014-3057 1873-1945 |
DOI: | 10.1016/j.eurpolymj.2007.05.035 |