Crosslinked Colorless Polyimide Films via Oxazole Groups as Crosslinking Agent:Preparation and Properties  

作　　者：He Wang Zhen-Chao Liu Xue Shang Li-Dong Feng Xin-Chao Bian Xue-Si Chen 

机构地区：[1]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei230026,China [2]Key Laboratory of Polymer Ecomaterials,Changchun Institute of APPlied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

出　　处：《Chinese Journal of Polymer Science》2024年第12期1905-1914,I0007,共11页高分子科学（英文版）

摘　　要：A series of transparent crosslinked colorless polyimide(CPI)films are prepared from 3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA),2,2'-bis(trifluoro-methyl)benzidine(TFMB),and 4,4'-oxydianiline(ODA)by thermal imidization,incorporating varying contents of 2,2'-(1,3-phenylene)bis(2-oxazoline)(1,3-PBO)as the crosslinking agent.Following the incorporation of the crosslinking structure,the CPI films show good optical transparency(approximately 85%winthin visible light range),enhanced glass transition temperature(from 325℃to 341℃),and improved thermal stability,and tensile strength.Notably,compared with the pristine uncrosslinked CPI,these crosslinked CPI films significantly increase in elongation at break(from 5.4%to 44.2%).Furthermore,the new approach ensures that crosslinked CPIs improve heat resistance and mechanical properties,while avoiding the embrittlement of materials.This study also offeres straightforward preparation methods for optically transparent crosslinked polyimides without additional processing steps.All these results make this approach can effectively improve the competitive performance of the CPI films for potential applications in microelectronic and optoelectronic fields.

关 键 词：POLYIMIDE Colorless transparent film Crossking structure Optical property Thermal property Mechanical property 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]