Dwivedi Sumant, Kaneko Tatsuo
Graduate School of Advanced Science and Technology, Energy and Environment Area, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
Japan Science and Technology, ALCA, Tokyo 102-0076, Japan.
Polymers (Basel). 2018 Mar 26;10(4):368. doi: 10.3390/polym10040368.
New soluble biopolyimides were prepared from a diamine derived from an exotic amino acid (4-aminocinnamic acid) with several kinds of tetracarboxylic dianhydride. The biopolyimide molecular structural flexibility was tailored by modifying the tetracarboxylic dianhydride moiety. The obtained polyimides were soluble in various solvents such as -methyl-2-pyrrolidone, ,-dimethylacetamide, ,-dimethylformamide, dimethyl sulfoxide, and even tetrahydrofuran. It was observed that the biopolyimide solubility was greatly dependent upon the structural flexibility (torsion energy). Flexible structure facilitated greater solubility. The synthesized biopolyimides were largely amorphous and had number-average molecular weight () in the range (5⁻8) × 10⁵. The glass transition temperatures () of the polymers ranged from 259⁻294 °C. These polymers exhibited good thermal stability without significant weight loss up to 410 °C. The temperatures at 10% weight loss () for synthesized biopolyimide ranged from 375⁻397 °C.
新型可溶性生物聚酰亚胺由一种源自稀有氨基酸（4-氨基肉桂酸）的二胺与几种四羧酸二酐制备而成。通过修饰四羧酸二酐部分来调整生物聚酰亚胺分子的结构柔韧性。所制得的聚酰亚胺可溶于多种溶剂，如N-甲基-2-吡咯烷酮、N,N-二甲基乙酰胺、N,N-二甲基甲酰胺、二甲基亚砜，甚至四氢呋喃。据观察，生物聚酰亚胺的溶解性很大程度上取决于结构柔韧性（扭转能）。柔性结构有助于提高溶解性。合成的生物聚酰亚胺大多为非晶态，数均分子量（Mn）在(5⁻8) × 10⁵范围内。聚合物的玻璃化转变温度（Tg）在259⁻294 °C之间。这些聚合物表现出良好的热稳定性，在高达410 °C时无明显失重。合成生物聚酰亚胺的10%失重温度（T10%）在375⁻397 °C之间。
