Effects of molar substitution of AA pendant on poly(MMA-co-GMA) under UV curing |
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Authors: | Sungchul Hong Moon-Sun Kim Byung-Woo Kim |
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Affiliation: | (1) Department of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746, Republic of Korea;(2) Bio/Nano-Fusion Material Research Center, Sungkyunkwan University, Suwon, 440-746, Republic of Korea |
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Abstract: | The molar substitution of an acrylic acid (AA) pendant group on a glycidyl methacrylate–methyl methacrylate copolymer was
investigated to evaluate its affects on mechanical properties and thermal stability under UV curing. Structural analysis was
conducted by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy (1H-NMR) to study the synthetic route of the acrylate copolymer. The mechanical behaviors of AA substituted copolymers were
interpreted in terms of both their loss tangent and elongation at the break point, because AA increases the cross-linking
density, which is directly proportional to the degree of homopolymerization; this relationship was monitored by 1H-NMR with various molar substitutions. In addition, the optical and mechanical properties of the copolymers were also characterized
by the extent of AA molar substitution. The optimal behavior was obtained at a molar substitution of 94.3% (equivalent to
an AA/GMA molar ratio of 1.4) and satisfied both the transparency (>89.3%) and elongation (>7.4%) requirements for the complex-shaped
coatings. |
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