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1、南開(kāi)大學(xué)博士學(xué)位論文新型光控取向液晶聚合物的合成與表征姓名：吳利平申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：高分子化學(xué)與物理指導(dǎo)教師：張保龍20050401與垂直于偏振紫外光的電場(chǎng)方向上的吸光度可知，所制備的取向薄膜具有良好的定向能力，該聚合物是一類具有潛在應(yīng)用價(jià)值的新型液晶光取向薄膜材料。同時(shí)，由于側(cè)鏈型液晶高分子具有分子可設(shè)計(jì)性和廣泛的應(yīng)用前景。本文以(甲基)丙烯酸酯類含有兩個(gè)手性中心的側(cè)鏈液晶高分子的合成為重點(diǎn)，通過(guò)改變側(cè)鏈中柔性間隔基的長(zhǎng)度，合成了一系列含有兩個(gè)手性中心的側(cè)鏈液晶(甲基)丙烯酸酯類聚合物。采用紅外、核磁和GPC表征了各中間體、單體及
2、聚合物的結(jié)構(gòu)和分子量。通過(guò)DSC和熱臺(tái)偏光顯微鏡系統(tǒng)地研究了單體和聚合物的液晶態(tài)織構(gòu)。結(jié)果表明，含有六個(gè)碳的柔性間隔基的丙烯酸酯類聚合物表現(xiàn)為近晶sA和手性近晶S’c液晶相。關(guān)鍵詞光取向，環(huán)加成，液晶織構(gòu)，相轉(zhuǎn)變，手性液晶高分子IIAbstractThecontrolofmolecularalignmentinliquid—crystalphaseatmacroscopicscaleshasbeeninvesfigatedextensiveIybecauseofitsimportanceinopticaloroptoelectrorgca
3、pplications．Itiswellestablishedthatliquidcrystalscanbealignedbymechanicalgroovingofsubstratesurface．Butconventionalrubbingtechniqueinpracticalapplicationhasseveralproblemssuch船dustandstaticchargeduetothemechanicalcontactofrubbingcloth，causingmechanicaldamageofactivedispla
4、ylayer．Moreover，thegeneralmethodtoachievehi學(xué)performanceforliquidcrystaldevicerequiressurfaceanchoringconditionsthatcannotbeinducedbyatraditionalmechanicalrubbingmethod．Therefore，thephoto-alignmenttechniqueforLCdisplayhasreceivedmuchattentioninrecentyearsbecauseofitscleana
5、ndphoto—paRernablesystemtowidentheviewingangle．ManykindsofphotoreactivepolymersthatCallundergoanisotropicisomerizationorphotocrosslinkingreactionshavebeenreportedforthephotoalignmentofLC．Nematicliquidcrystalcanbealignedhomogeneouslyonthephotoreactivepolymerfilmifexposedto
6、alinearlypolarizedlight．f15-1glAnisotropic[2+2】cycloadditionofthepolyvinylcinnamatefilmcallinduceirreversiblelowmolecularweightliquidcrystalalignment．119lHowever，mostpolymersinvestigatedrecentlyconminonlythecinnamoylgroupinthesidechainandthethermalstabilityispoor．Inthispa
7、per,wesynthesizedtwonoveloxetanemonomerscontainingbiphenyl，flexiblespacerandcirmamoylgroup．Themonomerswereinitiatedtopolymerizebyborontrifluorideetheraleandledtophotoreactivepolymers，whichishighlysensitivetothelinearlypolarizedlightphotochemically．Thethermalpropertiesandt
8、hemesophasestructureofthepolymerswereinvestigatedbydifferentialscanningcalorimetry(DSC)andtherma
