侧链“悬挂”偶氮苯小环的功能性聚合物的精密合成与其性能

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1、AbstractANovelPolymerwithCyclic-AzobenzenePendants：FineSynthesisandInvestigationonItsPropertiesresultsindicatedthatthecyclic-azobenzenehadhigherTmthanitslinearprecursorlinear-azobenzene.Besides,theglasstransitiontemperature(Tg)ofPcyclic-AzoMMAwasmeasuredbydifferentialscanningcalorimetry(DSC).Co

2、mparedwithlinearazobenzenesidechainsPlinear-AzoMMApossessedsimilarstructure,Pcyclic-AzoMMAshowedhigherTgthanPlinear-AzoMMA.(B)TheUV-visabsorptionchangesofphoto-inducedtrans-to-cisisomerizationofthelinear-azobenzene,cyclic-azobenzeneandPcyclic-AzoMMAinTHFwereinvestigatedbyirradiationwith365nmUVl

3、ight,andtheirthermally-drivencis-to-transrecoverywereocarriedoutthroughheatingirradiatedsamplesinthewater-bathat40C.Cyclic-azobenzenehadhighertrans-to-cisratesandslowercis-to-transratesthanitsprecursor.Besides,unlikethecyclic-azobenzene,thePcyclic-AzoMMAshowsmuchsmallercis-to-transrates.(C)Thef

4、luorescentemissionoflinear-azobenzeneandcyclic-azobenzeneinTHFsolutionswereinvestigatedbeforeandafterirradiationwith365nmUVlight.Thecyclic-azobenzenehasstrongerfluorescenceemissionthanitslinearprecursoratroomtemperature.AftertheUVlightirradiation,thefluorescenceintensitiesofthecyclic-andlinear-

5、azobenzenesolutionsincreasedwiththeirradiationtime.However,Pcyclic-AzoMMAinTHFsolutionshowednofluorescenceemissionbeforeorafterirradiationwith365nmUVlight.(D)TheSRGformationandopticalswitchingeffectsofthefilmofPcyclic-AzoMMAwerecarriedoutincomparisonwithPlinear-AzoMMAunderthesameconditions.Thea

6、veragemodulationdepth(M.D.)ofthePcyclic-AzoMMAwasthirtytimeslargerthanthatofthePlinear-AzoMMA.TheSRGandopticalswitchingofthePcyclic-AzoMMAandcyclic-AzoMMAweredeterminedunderidenticalconditions.TheM.D.ofthePcyclic-AzoMMAwaslargerthanthatofcyclic-AzoMMA.Keywords:cyclic-azobenzene•polymerwithpenda

7、ntsofthecyclic-azobenzene•photoisomerization•thermalandphotoresponsivepropertiesWrittenbyJiangyuLiSupervisedbyProf.NianchenZhouIV目录第一章文献综述............................................................................................