| Project/Area Number |
03044090
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
KIYOTSUKURI Tsuyoshi Kyoto Institute of Technology, Professor, 繊維学部, 教授 (60027860)
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| Co-Investigator(Kenkyū-buntansha) |
MICHAEL A. Schen National Institute of standards & Technology, USA, 国立標準局・高分子部門, 研究員
AIME S. Dereggi National Institute of standards & Technology, USA, 国立標準局・高分子部門, 研究員
G.THOMAS Dayis National Institute of standards & Technology, USA Group Leader, 国立標準局・高分子部門, グループリーダー
NAGATA Minoru Kyoto Prefectural University. Professor, 短期大学部, 教授 (40046511)
TSUTSUMI Naoto Kyoto Institute of Technology, Associate Professor, 繊維学部, 助教授 (50172036)
MICHAEL A.Sc 国立標準局, 高分子部門(米国), 研究員
AIME S.DeReg 国立標準局, 高分子部門(米国), 研究員
G.THOMAS Dav 国立標準局, 高分子部門(米国), グループリーダー
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1992: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1991: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Ferroelectric polymer / Crystallite dipoles / Inrernal electric field / Noncentrosymmetricity / Nonlinear optical effect / Nonlinear optical dye / Second harmonic generation / Curie transition temperature / PVDF / PMMAブレンド / βー結晶双極子 / 分極分布 / 非中心対称性 / 空間電荷 / 非線形光学 |
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| Research Abstract |
We have studied the internal electric field E_i created by the preferentially oriented beta-crystallite dipoles in the blend of 80 Wt% poly(vinylidene fluoride) (PVDF) and 20 Wt% poly(methyl methacrylate) (PMMA) and the blends of vinylidene fluoride-trifluoroethylene copolymer P(VDF-TrFE) and PMMA, and the second harmonic generation (SHG) from the noncentrosymmetrically oriented beta-crysrallite dipoles and nonlinear optical (NLO) dyes aligned by the internal electric field. We preparedmethyl methacrylate (MMA) copolymer having a NLO pendant group such as Disperse Red 1 (P(MMA-co-MMA-DR1)) as a SHG active polymer.
For both blends. E_i is 2 - 4 MV/cm which is three or four times larger the poling field. E_i for PVDF/PMMA blend is stabilized by the space charge. P(VDF-TrFE)/PMMA and P(VDF-TrFE)/P(MMA-co-MMA-DR1) have the clear Curie transition at the temperature around 105ﾟC. SHG coefficient d_<33> are 3.3 X 10^<-9> and 2.3 X 10^<-9> esu for P(VDF-TrFE) and (90/10) P(VDF-TrFE)/PMMA, respectively. For P(VDF-TrFE)/PMMA, E_i and d_<33> are thermally stable at the temperature above the glass transition temperature (T_g) and the abrupt decrease of them occurs when one approaches to the Curie temperature. Profile of d_<33> - temperature for P(VDF-TrFE)/P(MMA-co-MMA-DR1) is almost the same as that for P(VDF-TrFE)/PMMA. However, d_<33> for P(MMA-co-MMA-DR1) decreases at the temperature above 40ﾟC corresponding to the beta-relaxation of PMMAcomponenent and the large decrease starts at the temperature above 90ﾟC which is lower than T_g. It is particularly important to note that d_<33> for P(VDF-TrFE)/P(MMA-co-MMA-DR1) blend is thermally stable above T_g because the main contribution to SHG activity is due to noncentrosymmetric alignment of beta-crystallite dipoles NLO dye oriented by E_i.
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