一类含甲基结构高透明聚酰亚胺的合成与性能  

Synthesis and properties of a class of high transparent polyimides containing methyl structure

作　　者：余彬 张晓静 王俊儒 汪称意 蒋彩荣 赵晓燕 李坚 任强 Yu Bin;Zhang Xiaojing;Wang Junru;Wang Chenyi;Jiang Cairong;Zhao Xiaoyan;Li Jian;Ren Qiang(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《精细化工》2020年第2期278-283,共6页Fine Chemicals

基　　金：国家自然科学基金(21404016);江苏省重点研发计划(BE2017645);江苏省研究生实践创新计划(SJCX18-0954).

摘　　要：以2,6-二氨基甲苯、3,3′,4,4′-联苯四甲酸二酐、3,3′,4,4′-二苯醚四甲酸二酐为原料,间甲酚作为溶剂,经一步法高温共缩聚,制备一系列可溶性共聚型聚酰亚胺(MPI)。利用FTIR、1HNMR、DSC、TGA和UV等对MPI进行了结构确认与性能表征。结果表明:该系列MPI可溶于N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)、二甲基亚砜(DMSO)等有机溶剂,具有良好的溶解性和成膜性,并随着联苯酐含量的增加溶解性降低;同时,该系列MPI制得的薄膜具有良好的光学透过性能,在紫外光波长450nm时的透过率均在74%以上,截止波长在350 nm左右;该系列MPI的起始分解温度均超过457℃,800℃氮气氛围中的焦炭产率在63%以上,玻璃化转变温度在260~285℃之间,表现出优异的热学性能。此外,该系列MPI薄膜还具有良好的机械性能,其弹性模量在1.7~2.1 GPa之间,拉伸强度在89.7~120.6 MPa之间,断裂伸长率在19.7%~28.4%之间。A series of soluble methyl-containing polyimides(MPI)were prepared by a one-step hightemperature copolymerization using 2,6-diaminotoluene(TDA),3,3′,4,4′-biphenyltetracarboxylic dianhydride(BPDA)and 3,3′,4,4′-tetracarboxydiphthalic ether dianhydride(ODPA)as monomers,m-cresol as solvent.Their structures and properties were characterized by FTIR,1 HNMR,DSC,TGA,UV,etc.The results showed that this series of MPIs had good solubility in N-methyl pyrrolidone(NMP),N,Ndimethylacetamide(DMAc),dimethyl sulfoxide(DMSO)and so on solvents,and their solubility decreased with the increase of the content of biphenyl anhydride.Furthermore,these MPIs had film formation.The obtained films showed good optical transmission properties.The transmittance at the ultraviolet light wavelength of 450 nm was above 74%,and the cutoff wavelengths were around 350 nm.These polyimides also exhibited good thermal properties.Their initial decomposition temperatures were more than 457℃,their coke yield in 800℃nitrogen atmosphere was above 63%,and their glass transition temperatures were in the range of 260~285℃.Meanwhile,the MPIs films displayed good mechanical properties with elastic modulus,tensile strength and elongation at break were in the range of 1.7~2.1 GPa,89.7~120.6 MPa and 19.7%~28.4%,respectively.

关 键 词：聚酰亚胺 溶解性 光学透明性 功能材料 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]