Liu Feiyan, Liu Zhihong, Gao Shuyu, You Qingliang, Zou Liyong, Chen Jia, Liu Jiyan, Liu Xueqing
Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education China
Flexible Display Materials and Technology Co-innovation Center of Hubei Province, School of Chemistry and Environmental Engineering, Jianghan University Wuhan China.
RSC Adv. 2018 May 23;8(34):19034-19040. doi: 10.1039/c8ra02479k. eCollection 2018 May 22.
A facile approach to synthesize a polyimide (PI) film with enhanced dimensional stability, a high mechanical property and optical transparency is presented by embedding the partial imidized PI/SiC nanofiber-net in a poly(amic acid) (PAA) solution, followed by removing the solvent and imidization of the PAA. The nanofiber-network self-filled PI film demonstrates a much lower thermal expansion coefficient (CTE), an excellent mechanical property and high transparency retention in comparison to the film fabricated by solution cast. When the SiC content is 6 wt% in PI/SiC nanofibers, the CTE values for the PI film containing 25 wt% PI/SiC nanofibers are 2.80 times lower than the solution cast PI/SiC film. The tensile strength and modulus for the PI/SiC fiber filled film are also improved by 159% and 91% respectively in comparison to the solution cast SiC/PI film. In addition, the PI/SiC nanofiber-network filled PI film exhibits a high optic transparency. The significant improvement in aforementioned properties is contributed to by the long and continuous nanonetwork which acts as a frame to maintain the stable dimension and endow the film with high mechanical properties. Moreover, the nanosized SiC particles were constricted within the nano-fiber to avoid light scattering, so the high transparency of the film was retained.
通过将部分亚胺化的聚酰亚胺/碳化硅（PI/SiC）纳米纤维网嵌入聚酰胺酸（PAA）溶液中，随后去除溶剂并使PAA亚胺化，提出了一种简便的方法来合成具有增强尺寸稳定性、高机械性能和光学透明度的聚酰亚胺（PI）薄膜。与通过溶液浇铸制备的薄膜相比，纳米纤维网络自填充PI薄膜表现出低得多的热膨胀系数（CTE）、优异的机械性能和高透明度保持率。当PI/SiC纳米纤维中SiC含量为6 wt%时，含有25 wt% PI/SiC纳米纤维的PI薄膜的CTE值比溶液浇铸的PI/SiC薄膜低2.80倍。与溶液浇铸的SiC/PI薄膜相比，PI/SiC纤维填充薄膜的拉伸强度和模量也分别提高了159%和91%。此外，PI/SiC纳米纤维网络填充的PI薄膜表现出高光学透明度。上述性能的显著改善归因于长而连续的纳米网络，其作为框架来维持稳定尺寸并赋予薄膜高机械性能。此外，纳米尺寸的SiC颗粒被限制在纳米纤维内以避免光散射，因此薄膜保持了高透明度。
