4-Aminophenylalanine (4APhe), an exotic amino acid which is obtained as a microorganism metabolite of glucose, is polycondensed with various tetracarboxylic dianhydrides as a diamine monomer to obtain poly(amic acid)s. Subsequent thermal imidization of poly(amic acid)s is made at 220 °C with stepwise heating from 100 °C. Some of the obtained polyimides (PIs) exhibited good solubility in organic solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, and more. The progress of imidization was observed by proton nuclear magnetic resonance and infrared spectroscopy to confirm that the imidization ratio was up to 98%. Carboxylate group of the side-chains of PIs affected their solubilities despite the high imidization ratio, and the solubility was lost for any organic solvents by decarboxylation at 280 °C, confirmed from mass-loss of thermogravimetric analysis. Thus, a new series of PIs were obtained with abilities of solvent-molding in PI state and thermal resistivity enhancement by further heating after molding.

4-氨基苯丙氨酸（4APhe）是一种异源氨基酸，它是葡萄糖的微生物代谢产物，它与各种四羧酸二酐作为二胺单体缩聚，得到聚酰胺酸。随后在220°C进行热酰亚胺化，然后从100°C逐步加热。某些获得的聚酰亚胺（PI）在有机溶剂（如N，N-二甲基甲酰胺，N，N-二甲基乙酰胺等。通过质子核磁共振和红外光谱观察酰亚胺化的进展，证实酰亚胺化率高达98％。热重分析的质量损失证实，尽管酰亚胺化率高，但PI侧链的羧酸根基团仍会影响其溶解度，并且任何有机溶剂的溶解度都会在280°C下通过脱羧作用而丧失。因此，获得了一系列新的PI，其具有在PI状态下溶剂成型和通过在成型后进一步加热而提高热阻性的能力。