同质纳米纤维增强制备透明低膨胀系数聚酰亚胺  

Polyimide nanofiber self-reinforced film with high transparency and low thermal expansion coefficient

作　　者：赵依纯 刘飞燕[1] 孙志腾 尤庆亮[1] 刘学清[1] 刘继延[1] Yichun ZHAO;Feiyan LIU;Zhiteng SUN;Qingliang YOU;Xueqing LIU;Jiyan LIU(Key Laboratory of Photoelectrochemical Materials and Devices Ministry of Education,Hubei Flexible Display and Technology Collaborative Innovation Center,Jianghan University,Wuhan 430056,China)

机构地区：[1]江汉大学光电化学材料与器件教育部重点实验室,湖北省柔性显示与技术协同创新中心,武汉430056

出　　处：《复合材料学报》2021年第12期4023-4030,共8页Acta Materiae Compositae Sinica

基　　金：国家重点研发项目(子项目:2016YFB0401505);湖北省教育厅团队创新项目(T201935);武汉市科技攻关项(2018010401011279)。

摘　　要：应用于柔性显示的聚酰亚胺(Polyimide,PI)膜要求高透明性和低热膨胀系数C_(TE),而目前高透明聚酰亚胺的C_(TE)普遍高于40×10^(−6)/℃。本研究采用同质增强法,将高强度的纳米PI纤维与无色透明热塑性含氟聚酰亚胺(PI-F)复合,得到的纳米PI纤维增强PI-F基复合薄膜不仅保持PI-F的高透明,同时具有更低的C_(TE)和优异的拉伸性能。研究结果表明:纳米尺寸的纤维可减少光透过时发生的散射,使复合薄膜维持了较高的透明性。当纳米PI纤维质量分数为10%时,在可见光区其透光率达到80.5%,与纯PI-F薄膜相比,复合薄膜的C_(TE)值降低了40.3%,为28.3×10^(−6)/℃。其拉伸强度提高了132.9%,达到107.6 MPa,拉伸模量增大了89.5%,达到1152.2 MPa。The colorless polyimide(PI)used for the flexible display field is required to have high transparency and low thermal expansion coefficient C_(TE).However,the C_(TE) value of commercial colorless PI film is above 40×10^(−6)/℃.In the study,nanofiber self-filled PI film was prepared by embedding the PI nanofiber-net in thermoplastic fluorinated polyimide solution(PI-F).The nanofiber-net self-filled PI film demonstrates high transparency retention,much C_(TE) and excellent tensile property.The results show that the fiber of nanosize avoids light scattering,therefore the high transparency of the film is retained.When the PI fiber mass fraction is 10%,the transparency of the film is 80.5%.In comparison to the pure PI-F film,the CTE of composite film is reduced by 40.3%and reaches 28.3×10^(−6)/℃;The tensile strength and the tensile modulus of the composite film are increased by 132.9%and 89.5%,respectively and are 107.6 MPa and 1152.2 MPa correspondingly.

关 键 词：聚酰亚胺 纳米纤维 微结构 同质增强 热膨胀系数 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]