Kwac Lee Ku, Kim Byung-Joo, 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. 2025 Aug 15;15(35):29013-29022. doi: 10.1039/d5ra05012j. eCollection 2025 Aug 11.
Dianhydrides 4,4'-(4,4'-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) and dicyclo-hexyl-3,4,3',4'-tetracarboxylic dianhydride (HBPDA) were reacted with four different diamines to synthesize eight polyimide (PI) films through various heat treatment processes. BPADA contains aromatic benzene, whereas HBPDA contains alicyclic cyclohexane. The four diamine monomers contained either a linear benzene, highly electronegative trifluoromethyl (-CF) group, bulky sulfone (-SO-) group, or methyl (-CH) group between the benzene rings. The PIs obtained using the four different diamines and BPADA dianhydride were designated as series (I), while the PIs synthesized using HBPDA dianhydride were designated as series (II). To improve the physical properties of the synthesized PI films, all diamine structures contained hydroxy (-OH) groups capable of forming hydrogen bonds. The thermomechanical properties, optical transparencies, and solubilities of eight PI films synthesized from various monomer structures were investigated. Structure-property relationships were established through comparative analysis and film properties is also explained, and the results are compared. Overall, series (I), which contained aromatic dianhydride monomers, exhibited better thermomechanical properties than series (II) films, which contained cycloaliphatic dianhydride monomers. However, the optical transparency and solubility of the series (II) PIs were superior to those of the series (I) PI films.
二酐4,4'-(4,4'-异丙叉二苯氧基)双(邻苯二甲酸酐)(BPADA)和二环己基-3,4,3',4'-四羧酸二酐(HBPDA)与四种不同的二胺反应，通过各种热处理工艺合成了八种聚酰亚胺(PI)薄膜。BPADA含有芳香苯，而HBPDA含有脂环族环己烷。四种二胺单体在苯环之间含有直链苯、高电负性三氟甲基(-CF)基团、大体积砜基(-SO-)或甲基(-CH)基团。使用四种不同二胺和BPADA二酐得到的聚酰亚胺被指定为系列(I)，而使用HBPDA二酐合成的聚酰亚胺被指定为系列(II)。为了改善合成的PI薄膜的物理性能，所有二胺结构都含有能够形成氢键的羟基(-OH)基团。研究了由各种单体结构合成的八种PI薄膜的热机械性能、光学透明度和溶解性。通过对比分析建立了结构-性能关系，并对薄膜性能进行了解释，同时对结果进行了比较。总体而言，含有芳香族二酐单体的系列(I)比含有脂环族二酐单体的系列(II)薄膜表现出更好的热机械性能。然而，系列(II)聚酰亚胺的光学透明度和溶解性优于系列(I)聚酰亚胺薄膜。
