The Influences of Sulfoxide Electron Traps in Transparent Polyimides with Low Retardation, Yellow Index, and CTE,Macromolecular Materials and Engineering

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The Influences of Sulfoxide Electron Traps in Transparent Polyimides with Low Retardation, Yellow Index, and CTE
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-01-15 , DOI: 10.1002/mame.202000606
Pengfei Jiang ₁ , Jiulin Shen ₁ , Yao Wang ₁ , Jibin Zhang ₁ , Xiangfu Liu ₁ , Guoli Tu ₁

Affiliation

Due to the development of dynamic flexible organic light‐emitting diode displays, colorless polyimides (CPI) as the supporting or protecting optical films, are facing significant challenges due to the requirements of optical, mechanical, thermal, and chemical properties. Typical CPIs are derived from TFDB (2,2‐bis(trifluoro‐methyl)‐4,4′‐diaminobiphenyl)/6FDA (4,4′‐(hexafluoroisopropylidene)diphthalic anhydride), which still need to be improved in both dimensional stability and optical performance. In this communication, a strong electron acceptor group, the sulfoxide bond, is first introduced into the TFDB block of CPI chains. Based on this introduction, the distribution of the electron cloud in the polymer chain is reconstructed under the strongly pulling electron effect, and the spatial conformation of the polymer chain is also affected by the rigid and twisted sulfoxide group. The influences on CPI's optical properties, especially the refractive index and the retardation, are studied and discussed in detail by experimental results and theoretical calculations. It is shown that the CPI with the sulfoxide group exhibits higher optical transparency, lower yellow index, phase retardation and coefficient of thermal expansion, which is an ideal material for CPI optical films.

中文翻译：

低延迟，黄色指数和CTE的透明聚酰亚胺中亚砜电子陷阱的影响

由于动态柔性有机发光二极管显示器的发展，由于对光学，机械，热和化学性质的要求，作为支撑或保护光学膜的无色聚酰亚胺（CPI）面临着巨大的挑战。典型的CPI源自TFDB（2,2-双（三氟甲基）-4,4'-二氨基联苯）/ 6FDA（4,4'-（六氟异亚丙基）二邻苯二甲酸酐），在尺寸稳定性方面仍需改进和光学性能。通过这种通信，首先将一个强电子受体基团亚砜键引入CPI链的TFDB嵌段中。基于此介绍，在强拉电子效应下，聚合物链中电子云的分布得以重建，聚合物链的空间构象也受刚性和扭曲亚砜基团的影响。通过实验结果和理论计算，详细研究和讨论了对CPI光学性能的影响，特别是对折射率和延迟的影响。结果表明，具有亚砜基的CPI具有较高的光学透明性，较低的黄指数，相位延迟和热膨胀系数，是CPI光学膜的理想材料。

更新日期：2021-03-18

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