Synthesis and characterization of tough colorless poly(amide-imide)s containing cyclohexanedicarbonyl chloride with different trans:cis ratios

IF 2.9 4区 化学 Q2 POLYMER SCIENCE
Jinglei Xing, Lei Yang, Tianci Ma, Guofei Chen
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Abstract

With the rapid development of flexible optoelectronic devices, colorless polyimide films with excellent comprehensive performance have received widespread attention. In this work, a series of poly(amide-imide)s (PAIs) were synthesized by copolymerization of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride, 1,4-cyclohexanedicarbonyl chloride (CHDC) and 2,2′-bis(trifluoromethyl)benzidine. The thermal dimensional stability and mechanical properties of the PAI films were improved due to the introduction of rigid rod-like amide bonds in the polymer chain. In addition, the PAIs with more trans-CHDC content showed higher glass transition temperature (Tg) and lower coefficient of thermal expansion (CTE). At the same time, the cooperative conformational transitions of cyclohexane rings in trans-CHDC promoted molecular chain slip and improved the film toughness. Moreover, with the introduction of the cyclohexane moiety, these PAIs had excellent optical transparency and solubility. In particular, PAI-6 exhibited high Tg of 364 °C, low CTE of 29.8 ppm K−1, high transmittance of 87% at 400 nm, tensile modulus of 3.6 GPa and elongation at break of 9.7%. Therefore, the incorporation of cyclohexane structures and amide bonds into the main chain through copolymerization with CHDC provided a simple method for the synthesis of tough colorless PAIs with excellent comprehensive properties. © 2025 Society of Chemical Industry.

Abstract Image

含不同反顺比环己二羰基氯坚韧无色聚酰胺-亚胺的合成与表征
随着柔性光电器件的快速发展,综合性能优异的无色聚酰亚胺薄膜受到了广泛的关注。以4,4′-(六氟异丙基)二苯二酸酐、1,4-环己二羰基氯(CHDC)和2,2′-双(三氟甲基)联苯胺为原料,共聚合成了一系列聚酰胺-亚胺(PAIs)。由于在聚合物链中引入了刚性的棒状酰胺键,PAI薄膜的热尺寸稳定性和机械性能得到了改善。此外,反式chdc含量高的PAIs具有较高的玻璃化转变温度(Tg)和较低的热膨胀系数(CTE)。同时,环己烷环在反式chdc中的协同构象转变促进了分子链的滑移,提高了薄膜的韧性。此外,随着环己烷部分的引入,这些PAIs具有优异的光学透明度和溶解性。特别是PAI-6具有364℃的高Tg、29.8 ppm K−1的低CTE、高达87%的400 nm透光率、3.6 GPa的拉伸模量和9.7%的断裂伸长率。因此,通过与CHDC共聚,将环己烷结构和酰胺键引入主链,为合成综合性能优异的坚硬无色PAIs提供了一种简便的方法。©2025化学工业协会。
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来源期刊
Polymer International
Polymer International 化学-高分子科学
CiteScore
7.10
自引率
3.10%
发文量
135
审稿时长
4.3 months
期刊介绍: Polymer International (PI) publishes the most significant advances in macromolecular science and technology. PI especially welcomes research papers that address applications that fall within the broad headings Energy and Electronics, Biomedical Studies, and Water, Environment and Sustainability. The Journal’s editors have identified these as the major challenges facing polymer scientists worldwide. The Journal also publishes invited Review, Mini-review and Perspective papers that address these challenges and others that may be of growing or future relevance to polymer scientists and engineers.
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