Synthesis and Properties of Copolyterephthalamides Containing Biphenyl-2,2'-diyl Structure

Three series of copolyterephthalamides having biphenyl-2,2'-diyl structure in the main chain, were synthesized from p-phenylene-containing diamines such as p-phenylene diamine, 4,4'-oxydianiline or 1,4-bis(4-aminophenoxy)benzene, with mixed diacids of terephthalic acid and 2,2'-bibenzoic acid by the direct polycondensation method. The resulting copolymers had inherent viscosities ranging from 0.46 to 0.93dL/g, and most of them could be readily dissolved in polar aprotic solvents including N,N-dimethyl acetamide and N-methyl-2-pyrrolidone. These copolymers had glass transition temperatures between 239 and $326^{\circ}C$, and their 10% weight loss temperatures were recorded in the range of $410{\sim}485^{\circ}C$ in nitrogen atmosphere.

Biphenyl-2,2'-diyl 구조를 함유하는 Copolyterephthalamides의 합성과 성질

디아민으로서 p-phenylene diamine, 4,4'-oxydianiline, 1,4-bis(4-aminophenoxy)benzene에 대해 이염기산으로서 terephthalic acid와 2,2'-bibenzoic acid를 혼합 사용하여, 주쇄에 Biphenyl-2,2'-diyl 구조를 갖는 copolyterephthalamide를 직접중축합법에 의해 합성하였다. 얻어진 공중합체는 $0.46{\sim}0.93dL/g$의 본성점도를 나타내었으며, 이들 대부분은 N,N-dimethylacetamide와 N-methyl-2-pyrrolidone과 같은 범용 유기용매에 용해하였고, 유리전이온도는 $239^{\circ}C$와 $326^{\circ}C$ 사이의 값을 나타냈으며, 질소기류하 10% 열분해 온도는 $410{\sim}485^{\circ}C$였다.