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 년도별 목차보기 |
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| 발행년도/권호 |
1996 년 / 권호: V.8,no.2,Apr |
| 논문제목1(원어) |
Thermotropic Polyurethanes의 合成과 機能性에 관한 硏究 |
| 논문제목2(타언어) |
A Study on the Synthesis and Functional Properties of the Thermotropic Polyurethanes |
| 저자(원어) |
Lee, Jong Back (Institute of Industrial Science, Univ. of Tokyo, Roppongi, Minato-ku, Tokyo, Japan) Song, Jin Cherl (Dept. of Textile Eng., College of Eng. Pusan National Univ., Pusan, Korea) Choi, Dae Woong (Dept. of Chemical Eng., College of Eng. Donge |
| 저자(타언어) |
Lee, Jong Back (Institute of Industrial Science, Univ. of Tokyo, Roppongi, Minato-ku, Tokyo, Japan) Song, Jin Cherl (Dept. of Textile Eng., College of Eng. Pusan National Univ., Pusan, Korea) Choi, Dae Woong (Dept. of Chemical Eng., College of Eng. Donge |
| 소속(원어) |
Lee, Jong Back (Institute of Industrial Science, Univ. of Tokyo, Roppongi, Minato-ku, Tokyo, Japan) |
| 소속(타언어) |
Lee, Jong Back (Institute of Industrial Science, Univ. of Tokyo, Roppongi, Minato-ku, Tokyo, Japan) |
| 시작/끝
페이지 |
1 ~ 7 총페이지 : 7 |
| 언어(원어) |
Korean |
| 초록 |
Thermotropic liquid-crystalline polyurethanes were synthesized by the polyaddition reaction of such para-substiuted diisocyanate monomer as 1,4-phenylene diisocyanate(1,4-PDI) and 2,5-tolylene diisocyanate(2,5-TDI), with 4,4\\\'-bis(-hydroxyalkoxy)biphenyls(BPm: ; m is the carbon number of the hydroxyalkoxy group). These polyurethanes have mesogenic biphenyl units in the main chain. Properties of polymers were studied by differential scanning calorimetry, wide-angle X-ray scattering, thermogravimetic analysis, polarizing microscopy, and infraed spectroscopy. DSC thermograms for these polymers exhibited two endothermic peaks corresponding to phase transitions of melting and isotropization. Mesomorphic behavior of the polyurethanes were also observed under the polarizing microscope. For example, polyurethane 2,5-YDI/BP5 with []=0.44 prepared from 2,5-TDI and BP5 exhibited a liquid crystalline phase from 194 to 205. Infrared spectrum study indicated that the hydrogen bonding between urethane linkages affected the mesomorphism. The thermostabilities of polyurethanes 2,5-TDI/BP5 and 1,4-PDI/BP5 were measured at a heating rate of 1/min in air. The temperatures of 5% weight loss for 2,5-TDI/BP5 and 1,4-PDI/BP5 were 297 and 334, respectively. |
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