液晶与显示
液晶與顯示
액정여현시
Chinese Journal of Liquid Crystals and Displays
2015年
5期
757-762
,共6页
刘露露%刘明%龚世铭%汪映寒
劉露露%劉明%龔世銘%汪映寒
류로로%류명%공세명%왕영한
聚酰亚胺%主链结构%液晶取向膜%垂直取向%耐摩擦性能
聚酰亞胺%主鏈結構%液晶取嚮膜%垂直取嚮%耐摩抆性能
취선아알%주련결구%액정취향막%수직취향%내마찰성능
polyimide%backbone structure%LC alignment layer%vertical alignment%rubbing resistance
采用一步法,以 N,N-二(4-氨基苯基)-4-(十二烷氧基联苯基)-4’-氨基苯醚(C12-BAAPE)为控制预倾角的功能性二胺,2,2’-双三氟甲基-4,4’-联苯二胺(TFDB)或4,4’-二氨基二苯醚(ODA)为辅助二胺,分别与2,2’-双(3,4-二羧苯基)六氟丙烷四羧酸二酐(6FDA)和4,4’-联苯醚二酐(ODPA)聚合,得到三种主链结构不同的聚酰亚胺(PI-1、PI-2和PI-3)。利用 NMR、FT-IR、DSC、TGA、偏光显微镜和预倾角测试仪对聚合物的结构、热性能以及制备的液晶盒的取向性进行了表征,同时测试了3种 PI 的溶解性能。结果表明,PI-2液晶取向膜的耐摩擦性能明显优于 PI-1和 PI-3,且具有更高的玻璃化转变温度(T g )和分解温度(T d ),更好的溶解性能。分子模拟(MS)表明,由于 PI-2分子主链垂直构象的存在,增加了分子链的刚性,因而提高了取向膜的耐摩擦性能。
採用一步法,以 N,N-二(4-氨基苯基)-4-(十二烷氧基聯苯基)-4’-氨基苯醚(C12-BAAPE)為控製預傾角的功能性二胺,2,2’-雙三氟甲基-4,4’-聯苯二胺(TFDB)或4,4’-二氨基二苯醚(ODA)為輔助二胺,分彆與2,2’-雙(3,4-二羧苯基)六氟丙烷四羧痠二酐(6FDA)和4,4’-聯苯醚二酐(ODPA)聚閤,得到三種主鏈結構不同的聚酰亞胺(PI-1、PI-2和PI-3)。利用 NMR、FT-IR、DSC、TGA、偏光顯微鏡和預傾角測試儀對聚閤物的結構、熱性能以及製備的液晶盒的取嚮性進行瞭錶徵,同時測試瞭3種 PI 的溶解性能。結果錶明,PI-2液晶取嚮膜的耐摩抆性能明顯優于 PI-1和 PI-3,且具有更高的玻璃化轉變溫度(T g )和分解溫度(T d ),更好的溶解性能。分子模擬(MS)錶明,由于 PI-2分子主鏈垂直構象的存在,增加瞭分子鏈的剛性,因而提高瞭取嚮膜的耐摩抆性能。
채용일보법,이 N,N-이(4-안기분기)-4-(십이완양기련분기)-4’-안기분미(C12-BAAPE)위공제예경각적공능성이알,2,2’-쌍삼불갑기-4,4’-련분이알(TFDB)혹4,4’-이안기이분미(ODA)위보조이알,분별여2,2’-쌍(3,4-이최분기)륙불병완사최산이항(6FDA)화4,4’-련분미이항(ODPA)취합,득도삼충주련결구불동적취선아알(PI-1、PI-2화PI-3)。이용 NMR、FT-IR、DSC、TGA、편광현미경화예경각측시의대취합물적결구、열성능이급제비적액정합적취향성진행료표정,동시측시료3충 PI 적용해성능。결과표명,PI-2액정취향막적내마찰성능명현우우 PI-1화 PI-3,차구유경고적파리화전변온도(T g )화분해온도(T d ),경호적용해성능。분자모의(MS)표명,유우 PI-2분자주련수직구상적존재,증가료분자련적강성,인이제고료취향막적내마찰성능。
A series polyimides (PIs)were prepared by one-step method.These PIs were comprised of a functional diamine N,N-bis (4-aminophenyl )-4-(dodecylo-xy-biphenyl )-4′-amino-phenylether (C1 2 -BAAPE),one of two commercially available diamines 2,2′-Bis(trifluoromethy-l)-4,4′-diaminobiphe-nyl (TFDB),4,4′-Oxydianiline (ODA)and one of two dianhydride 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA)and 4,4′-Oxydiphthalic anhydride (ODPA)in order to get different backbone structures.The structures and thermo properties of these PIs were characterized by NMR, FT-IR,DSC and TGA.Pretilt angles and alignment abilities were carried out by pretilt angle tester and polarization microscope.Solubility of PIs was tested by dissolving PIs in various organic solvents. DSC and TGA curves showed that PI-2 had higher glass transition temperature (T g )and decomposi-tion temperature (T d )than PI-1 and PI-3.Three PI films presented vertical alignment before mechan-ical rubbing and only PI-2 maintained it after rubbing process.Conformations of these PIs were simu-lated by Material Studio (MS).The vertical conformation existed in PI-2 ’s backbones improved rubbing resistance and showed vertical alignment ability after rubbing.
