Improvement of the physical properties of poly(methyl methacrylate) by copolymerization with N-pentafluorophenyl maleimide; zero-orientational and photoelastic birefringence polymers with high glass transition temperatures |
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Authors: | Tagaya Akihiro Lou LiPing Ide Yoko Koike Yasuhiro Okamoto Yoshiyuki |
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Institution: | TAGAYA Akihiro1,2*, LOU LiPing3, IDE Yoko1, KOIKE Yasuhiro1,2 & OKAMOTO Yoshiyuki1,3* 1Keio Photonics Research Institute, Keio University, E-building, Shin-Kawasaki Town Campus, 7-1 Shin-Kawasaki, Saiwai-ku, Kawasaki 212-0032, Japan 2Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan 3Polymer Research Institute, Polytechnic Institute of NYU, 6 MetroTech Center, Brooklyn, New York 11201, USA |
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Abstract: | Copolymers of N-pentafluorophenyl maleimide (PFPMI) with methyl methacrylate (MMA) were synthesized by a free radical initiator, such as AIBN. The refractive indexes of the copolymers remained nearly constant (1.4970 at 532 nm) regardless of the polymer composition. These copolymers also showed high thermal stability. The orientational and photoelastic birefringence of the copolymers obtained were measured. Since both of the orientational and photoelastic birefringences of PMMA are negative whereas poly(PFPMI) exhibits positive, thus we have obtained nearly zero orientational and photoelastic birefringence polymers when the ratios of MMA/PFPMI were 91.8/8.2 and 97.0/3.0 mol%, respectively. Based on the experimental data, the ratios of MMA/PFPMI for zero birefringence were determined to be 88.9/11.1 and 93.8/6.2 mol% for orientational and photoelastic birefringence, respectively. The Tgs of corresponding copolymers were estimated to be 128 and 122 ℃. |
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Keywords: | N-pentafluorophenyl maleimide copolymers orientational birefringence photoelastic birefringence |
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