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1、物理化學(xué)學(xué)報(bào)(WuliHuaxueXuebao)1056ActaPhys.鄄Chim.Sin.,2006,22(9)：1056耀1060September[Article]www.whxb.pku.edu.cn含氟光敏單體的液晶光控取向研究1,21,21,21,2費(fèi)春紅張伶莉姚麗雙呂鳳珍311*敖志敏彭增輝宣麗(1中國(guó)科學(xué)院長(zhǎng)春光學(xué)精密機(jī)械與物理研究所,應(yīng)用光學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室,長(zhǎng)春130033；2中國(guó)科學(xué)院研究生院,北京100049；3吉林大學(xué)材料科學(xué)與工程學(xué)院,長(zhǎng)春130022)摘要制備了系列含氟光敏單體材料,六氟雙酚A雙肉桂酸酯(6F鄄BADE)與含二氟亞甲基結(jié)構(gòu)的肉桂酸酯(FDE
2、鄄n,n=2,3,4).材料在線性偏振紫外光輻照下均可發(fā)生定向光交聯(lián)反應(yīng),通過(guò)紅外光譜和凝膠滲透色譜跟蹤檢測(cè),表明光交聯(lián)類(lèi)型為[2+2]環(huán)加成.單體光聚后形成的取向膜對(duì)液晶分子排列效果不同,6F鄄BADE取向膜誘導(dǎo)液晶分子垂直排列,FDE鄄n取向膜誘導(dǎo)液晶分子平行排列.用原子力顯微鏡對(duì)取向膜表面進(jìn)行表征,均未觀察到明顯的各向異性分布現(xiàn)象.應(yīng)用量子力學(xué)半經(jīng)驗(yàn)方法AM1分析發(fā)現(xiàn)單體分子極性有較大差異,認(rèn)為分子極性的差異是誘導(dǎo)液晶取向不同的主要原因.關(guān)鍵詞：液晶,光敏單體,[2+2]環(huán)加成,光控取向,氟,半經(jīng)驗(yàn)方法中圖分類(lèi)號(hào)：O647AlignmentBehaviorofLiquidCrys
3、talsontheCrosslinkedFilmofMonomerswithFluorinatedGroups1,21,21,21,2FEI,Chun鄄HongZHANG,Ling鄄LiYAO,Li鄄ShuangL譈,Feng鄄Zhen311*AO,Zhi鄄MinPENG,Zeng鄄HuiXUAN,Li(1StateKeyLaboratoryofAppliedOptics,FineMechanicsandPhysics,ChangchunInstituteofOptics,ChineseAcademyofSciences,Changchun130033,P.R.China；2Gradu
4、ateSchooloftheChineseAcademyofSciences,Beijing100049,P.R.China；3CollegeofMaterialScienceandEngineering,JilinUniversity,Changchun130022,P.R.China)AbstractAseriesofphotosensitivemonomers,includinghexafluorobiphenolAdicinnamateester(6F鄄BADE)andfluorinateddicinnamateesters(FDE鄄n,n=2,3,4),weresynthes
5、ized.Thesemonomerscouldbecrosslinkedunderirradiationoflinearlypolarizedultravioletlight.FTIRspectraandGPCspectrawereusedtomeasuretheresultsinrealtime.Theresultsindicatedthatthecrosslinkingreactionwas[2+2]cycloaddition.Thephotoalignmentfilmsformedbymonomersundertheultravioletlightcouldinducediffe
6、renttypesofliquidcrystal(LC)alignments：6F鄄BADEandFDE鄄nfilmsresultedinverticalandparallelalignments,respectively.AFMimagesofthesurfacesofthealignmentshowednoobviousanisotropyonthesurfacesofthesefilms.Finally,itwasfoundthat,usingsemiempiricalmethodAM1ofquantummechanics,thedifferenceofthepolarities
7、amongdifferentmonomermoleculeswaslarge,whichwasconsideredtobethemaincauseresultingindifferentLCalignments.Keywords：Liquidcrystal,Photosensitivemonomers,[2+2]cycloaddition,Photoalignment，F(xiàn)luorine,Semiempiricalmethod[1鄄2]液晶顯示器
