Soluble Poly(amide-imide)s from Diamide-Diamine Monomer with Trifluoromethyl Groups.

ABSTRACT: A series of soluble aromatic poly(amide-imide)s (PAIs) was prepared from a new diamide-diamine monomer having biphenyl units with two CF3 groups. The diamide-diamine monomer was polymerized with 2,2'-bis(trifluoromethyl)benzidine and pyromelltic dianhydride through an imidization reaction to prepare PAIs with a controlled imide/amide bond ratio in the main chains. While the PAIs with the highest imide bond content showed a limited solubility, other PAIs were soluble in polar organic solvents and can be solution-cast into flexible freestanding films. All PAIs exhibited high thermal stability with 5% weight loss temperature (Td5) from 464 to 497 °C in air, and no appearance of glass transition up to 400 °C. Notably, the linear coefficient of thermal expansion (CTE) value of the PAI films was

SUBMITTER: Byun T 

PROVIDER: S-EPMC8840246 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature