Choi Moon Young, Lee Seon Ju, Kwac Lee Ku, Kim Hong Gun, Chang Jin-Hae
Graduate School of Carbon Convergence Engineering, Jeonju University Jeonju 55069 Korea.
Institute of Carbon Technology, Jeonju University Jeonju 55069 Korea
RSC Adv. 2021 Sep 13;11(48):30479-30486. doi: 10.1039/d1ra03999g. eCollection 2021 Sep 6.
To fully understand the structure-property relationship of aromatic copoly(amide-imide)s (Co-PAIs) and determine which factors lead to chain rigidity, we prepared two series of Co-PAIs. They were synthesized from two types of amine monomers containing - and -isomers and different ratios of 4,4'-(hexafluoroiso-propylidene)diphthalic anhydride (6FDA) and 4,4'-biphthalic anhydride (BPA). -Substituted and -substituted ,'-[2,2'-bis(trifluoromethyl)-4,4'-biphenylene]bis(aminobenzamide) (MPAB) diamine isomers were synthesized from 3- and 4-nitrobenzoyl chloride and 2,2'-bis(trifluoromethyl) benzidine (TFB), respectively. The Co-PAI films were synthesized from poly(amic acid) (PAA), solution-casting, followed by thermal imidizations. The thermal- and mechanical-properties and optical transparency of the Co-PAI films with different BPA monomer contents were investigated. We also investigated the effects of the different MPAB isomers on the Co-PAI structures. Compared with the -substituted MPAB Co-PAI films, the -substituted MPAB Co-PAI films have superior thermo-mechanical properties at the same monomer content. However, the optical transparencies of the -MPAB Co-PAIs are slightly better than those of the -MPAB Co-PAIs.
为了全面理解芳香族共聚（酰胺 - 酰亚胺）（Co - PAIs）的结构 - 性能关系，并确定哪些因素导致链刚性，我们制备了两个系列的Co - PAIs。它们由两种含有 - 和 - 异构体的胺单体以及不同比例的4,4'-（六氟异亚丙基）二邻苯二甲酸酐（6FDA）和4,4'-联苯二甲酸酐（BPA）合成。 - 取代和 - 取代的，'-[2,2'-双（三氟甲基）-4,4'-联苯撑]双（氨基苯甲酰胺）（MPAB）二胺异构体分别由3 - 和4 - 硝基苯甲酰氯与2,2'-双（三氟甲基）联苯胺（TFB）合成。Co - PAI薄膜由聚（酰胺酸）（PAA）通过溶液浇铸法合成，随后进行热亚胺化。研究了不同BPA单体含量的Co - PAI薄膜的热性能、机械性能和光学透明度。我们还研究了不同MPAB异构体对Co - PAI结构的影响。与 - 取代的MPAB Co - PAI薄膜相比，在相同单体含量下， - 取代的MPAB Co - PAI薄膜具有更优异的热机械性能。然而， - MPAB Co - PAIs的光学透明度略优于 - MPAB Co - PAIs。
