| Budget Amount *help |
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1988: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1987: ¥2,700,000 (Direct Cost: ¥2,700,000)
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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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