1988 Fiscal Year Final Research Report Summary
Synthesis and Structure Analysis of High-strength High-modulus Polymeric Materials by Molecular Design
| Project/Area Number |
62470101
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | University of Tokyo |
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Principal Investigator |
URYU Toshiyiki Institute of Industrial Science, 生産技術研究所, 教授 (80011005)
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| Co-Investigator(Kenkyū-buntansha) |
HATANAKA Kenichi Institute of Industrial Science, 生産技術研究所, 助手 (70167584)
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| Project Period (FY) |
1987 – 1988
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| Keywords | High-strength high-modulus polymer / aromatic polyester / aromatic poly(ester amide) / long alkylene spacer / thermotropic liquid crystallinity |
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| Research Abstract |
In this study, high-strength high-modulus aromatic polyesters containing long lalkylene spacers were synthesized. Aromatic polyesters are processed making use of liquid crystallinity. First, we found that naphthalene-based aromatic polyesters containing long alkylene spacers have a regular conformation, in which the alkylene has a zigzag conformation, and are of thermotropic liquid crystallinity with a wide transition range. Secondly, thermotropic poly(ester amides) having long alkylene (=decamethylene) spacers in the polymer backbone were synthesized. When 4,4'-diamino-3,3'-dimethoxybiphenol and p-aminophenol in combination were used as amide components, poly(ester amides) containing up to 60 mol% of amide groups showed thermotropic liquid crystallinity.
Thirdly, it was revealed that high-strength high-modulus polymeric materials were obtained by molding thermotropic aromatic polyesters containing long alkylene spacers. High temperature melt polycondensation afforded high-molecular-weight aromatic polyesters which are necessary for obtaining high strength materials. Changing the p-phenylene group in poly(p-arylene) 4,4'-dioxyhexamethyl-enedibenzoate), various polyesters were prepared, and injected into a dumbbell-type test piece. Tensile strength of the test piece was measured with a tensile strength tester. Methylphenylene, phenylphenylene, and 2,6-naphthalene as a p-arylene group gave high-strength molded materials.
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Research Products
(6 results)
