Preparation and characterization of low expansion transparent copolyimide films
ZHANG Ming-yan1,2, GAO Sheng1, WU Zi-jian1,2, CUI Hong-yu1, GAO Yan1
1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2. Engineering Dielectrics and Its Application Key Laboratory(Ministry of Education), Harbin University of Science and Technology, Harbin 150080, China
Abstract：Five transparent polyimide thin films with different proportions of 1,2,4,5-,pyromellitic dianhydride (PMDA) were made by copolymerization of 4,4'-(six fluoro isopropenyl) two phthalic anhydride (6FDA), 4,4'-two amino -2,2'-double three trifluoromethyl biphenyl (TFMB) and PMDA, and their properties were characterized. The results show that thermal stability and heat resistance are increased after the introduction of rigid monomers; the dielectric constant of the films is increased with the increase of PMDA content; homopolymer film has higher light transmission rate than copolymer films in visible light; tensile test shows that adding a small amount of PMDA, the tensile strength and elastic modulus of the film are increased, but when the content of PMDA is higher than 40%, the mechanical properties are decreased; the coefficient of thermal expansion of the films are decreased obviously while PMDA content is increased.
[1] MATIVENGA M,GENG D,KIM B,et al.Fully transparent and rollable electronics[J].ACS Applied Materials&Interfaces,2015,7(3):1578-1585.
[2] CHEN J L,LIU C T.Technology advances in flexible displays and substrates[J].IEEE Access,2013,1:150-158.
[3] YOO H G,PARK K I,KOO M,et al.Flexible GaN LED on a polyimide substrate for display applications[J].Proceedings of SPIE,2012,8268:82681Y.
[4] GHOSH D S,CHEN T L,MKHITARYAN V,et al.Ultrathin transparent conductive polyimide foil embedding silver nanowires[J].ACS Applied Materials & Interfaces,2014,6(23):20943-20498.
[5] MEADOR M A,MALOW E J,SILVER R,et al.Mechanically strong,flexible polyimide aerogels cross-linked with aromatic triamine[J].ACS Applied Materials & Interfaces,2012,4(2):536-544.
[6] QIU X M,WANG H Q,ZHOU C Y,et al.Polyimide/kaolinite composite films:synthesis and characterization of mechanical,thermal and waterproof properties[J].Journal of the Taiwan Institute of Chemical Engineers,2014,45(4):2021-2028.
[7] DAMACEANU M D,SAVAI I,CONSTANTIN C P.The chromic and electrochemical response of CoCl2-filled polyimide materials for sensing applications[J].Sensors & Actuators:B Chemical,2016, 234:549-561.
[8] 刘含洋,赵伟栋,潘玲英,等.结构、耐热、透波功能一体化石英/聚酰亚胺研究[J].航空材料学报,2015,35(4):34-38. LIU H Y,ZHAO W D,PAN L Y,et al.Study on structure,heat resistence property and electromagnetic property of quartz fiber rein-forced polyimide composite[J].Journal of Aeronautical Materials,2015,35(4):34-38.
[9] 房光强,沈登雄,栗付平,等.聚酰亚胺/SiO2纳米复合抗原子氧气凝胶的合成与性能[J].材料工程,2015,43(12):17-21. FANG G Q,SHEN D X,LI F P,et al.Synthesis and properties of atomic-oxygen resistant polyimide-SiO2 nanocomposite aerogels[J].Journal of Material and Engineering,2015,43(12):17-21.
[10] BESSONOV M I,ZUBKOV V A.Polyamic acids and poly-imides:synthesis,transformations,and structure[J].Rusi Journal, 1993, 159(6):28-32.
[11] CHOIA H,SOHN B,CHANG J H.Synthesis and characteriza-tion of transparent copolyimide films containing CF3groups:comparison with copolyimide nanocomposites[J].Aplied Clay Science,2010,48(1):117-126.
[12] 吕静,党智敏.低热膨胀系数纳米碳化硅/聚酰亚胺复合薄膜的制备与性能[J].复合材料学报,2011,28(5):41-45. LV J,DANG Z M.Preparation and properties of nano-SiC/polyimide composite films with low thermal expansion char-acteristic[J].Acta Materiae Compositae Sinica,2011,28(5):41-45.
[13] 徐庆玉,范和平,王洛礼.低热膨胀聚酰亚胺研究进展[J].高分子材料科学与工程,2002,18(6):29-31. XU Q Y,FAN H P,WANG L L.Synthesis and characterization of macromoleclue with crosslinked structure[J].Polymer Mater-ials Science and Engineering,2002,18(6):29-31.
[14] NUMATA S,OOHARA S,IMAIZUMI J,et al.Thermal expan-sion behavior of various aromatic polyimide[J].Journal of Applied Polymer Science,2010,31(1):101-110.
[15] SHANG Y M, FAN L,YANG S Y,et al.Synthesis and charac-terization of novel fluorinated polyimides derived from 4-phenyl-2,6-bis[4-(4'-amino-2'-trifluoromethyl-phenoxy)phenyl] pyr-idine and dianhydrides[J].Europe Polymer,2006,42(5):981-989.
[16] 俞娟,蒋远媛,阔正波,等.高模量、低热膨胀系数聚酞亚胺杂化薄膜的制备[J].材料导报,2009,23(14):58-60. YUE J,JIANG Y Y,KUO Z B,et al.Preparation of polyimide hybrid films with high modulus,low thermal expansion coeffi-cient[J].Materials Review,2009,23(14):58-60.
2019, Vol. 47 
