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1、物理化学学报(WuliHuaxueXuebao)1056ActaPhys.鄄Chim.Sin.,2006,22(9)：1056耀1060September[Article]www.whxb.pku.edu.cn含氟光敏单体的液晶光控取向研究1,21,21,21,2费春红张伶莉姚丽双吕凤珍311*敖志敏彭增辉宣丽(1中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,长春130033；2中国科学院研究生院,北京100049；3吉林大学材料科学与工程学院,长春130022)摘要制备了系列含氟光敏单体材料,六氟双酚A双肉桂酸酯(6F鄄BADE)与含二氟亚甲基结构的肉桂酸酯(FDE
2、鄄n,n=2,3,4).材料在线性偏振紫外光辐照下均可发生定向光交联反应,通过红外光谱和凝胶渗透色谱跟踪检测,表明光交联类型为[2+2]环加成.单体光聚后形成的取向膜对液晶分子排列效果不同,6F鄄BADE取向膜诱导液晶分子垂直排列,FDE鄄n取向膜诱导液晶分子平行排列.用原子力显微镜对取向膜表面进行表征,均未观察到明显的各向异性分布现象.应用量子力学半经验方法AM1分析发现单体分子极性有较大差异,认为分子极性的差异是诱导液晶取向不同的主要原因.关键词：液晶,光敏单体,[2+2]环加成,光控取向,氟,半经验方法中图分类号：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，Fluorine,Semiempiricalmethod[1鄄2]液晶显示器
