1994 Fiscal Year Final Research Report Summary
High Pressure Synthesis and Ordered Structure Formation of Condensation Polymers
| Project/Area Number |
05453142
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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 | TOKYO Institute of Technoloqy |
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Principal Investigator |
IMAI Yoshio Tokyo Institute Technology, Faculty of Engineering, Professor, 工学部, 教授 (50016557)
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| Co-Investigator(Kenkyū-buntansha) |
OKUI Norimasa Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (20111651)
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| Project Period (FY) |
1993 – 1994
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| Keywords | High Pressure Polycondensation / Salt Monomer Method / Polyimide Synthesis / Highly Crystalline Polyimides / Thermotropic Liquid Crystalline Polyimides |
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| Research Abstract |
By using a piston-cylinder type hot-pressing apparatus, we synthesized three series of aliphatic polyimides of high molecular weights by the high pressure polycondensation of the salt monomers composed of the aliphatic diamines having 6-12 methylene units and the aromatic tetracarboxylic acids such as pyromellitic acid, biphenyltetracarboxylic acid and terphenyltetracarboxylic acid at 250-320ﾟC under 220 MPa. The aliphatic polypyromellitimides and the polyimides derived from biphenyltetracarboxylic acid had high crystallinity, and their melting points exhibited an odd-even effect against the number of methylene units. The terphenyltetracarboxylic acid-based polyimides were found for the first time to have thermotropic liquid crystallinity.
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