High Pressure Synthesis and Ordered Structure Formation of Condensation Polymers

缩聚物的高压合成和有序结构形成

• 批准号: 05453142
• 负责人: IMAI Yoshio
• 金额: $ 4.67万
• 依托单位: TOKYO Institute of Technoloqy
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05453142/
• 关键词: High Pressure Polycondensation; Salt Monomer Method; Polyimide Synthesis; Highly Crystalline Polyimides; Thermotropic Liquid Crystalline Polyimides; ポリベンゾオキサゾール合成

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.

采用活塞缸式热压装置，以6-12个亚甲基单位的脂肪族二胺与芳香族四羧酸、联苯四羧酸、三苯基四羧酸组成的盐单体为原料，在250 ~ 320℃的温度下，在220 MPa下进行高压缩聚，合成了3个系列的高分子量脂肪族聚酰亚胺。脂肪族聚酰亚胺和由联苯四羧酸衍生的聚酰亚胺具有较高的结晶度，熔点对亚甲基单位数呈奇偶效应。首次发现了三苯基四羧酸基聚酰亚胺具有热致液晶性。