| 手性丙烯酸酯侧链液晶共聚物的正电子湮没寿命谱研究 |
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| 引用本文： | 何流,张树范,漆宗能,王佛松,魏龙,王文华.手性丙烯酸酯侧链液晶共聚物的正电子湮没寿命谱研究[J].高分子材料科学与工程,1998(2). |
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| 作者姓名： | 何流 张树范 漆宗能 王佛松 魏龙 王文华 |
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| 作者单位： | 中国科学院化学研究所，中国科学院高能物理研究所核技术开放实验室 |
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| 摘 要： | 用正电子湮没寿命谱研究了手性丙烯酸酯侧链液晶共聚物分子主链与介晶基元侧链的运动行为及相互作用。结果表明，侧链液晶基元的取向随磁场强度增加而增加，当磁场强度达到一定值后则趋于恒定。侧链介晶基元受磁场的诱导取向对分子主链运动的影响为非线性效应。
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| 关 键 词： | 正电子湮没寿命，侧链液晶共聚物，液晶基元，运动行为 |
STUDY OF POSITRON ANNIHILATION LIFETIME SPECTRSCOPY OF CHIRAL SIDE CHAIN LIQUID CRYSTALLINE COPOLYACRYLATE |
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| Abstract: | Motional behaviour and interaction between main chain and side chain of mesogenic moiety of liquid crystalline copolymer were studied by positron annihilation lifetime spectroscopy. The results indicate that positron annihilation lifetime and intensity of chacterization orientation order of side chain mesogenic moiety of the copolyacrylate increases with increasing magnetic density and then levels off after magnetic density is above 6000 guases. The lifetime, and intensity, I-3, of ortho-positronium (o-ps) annihilation fluctuates with increasing magnetic density. The magnetic field induced orientation of side chain has a nonlinear effect on the motion of main chain. |
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| Keywords: | side chain crystalline copolyacrylate positron annihilation lifetime mesogenic moiety motional behaviour |
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