简介:Anon-linearoptical(NLO)materialwassynthesizedbymeansofasimplemethod.Thismaterialcanbeappliedinelectro-optical(EO)devices,suchasEOswitchesandmodulators.TheDisperseRed1(DR1)wasdopedinpolymethyl-methacrylate-co-glycidylmethacrylate(PMMA-co-GMA)astheNLOactivechromophore.Thesynthesisprocessandmaterialstructurewereexpressed.Thethermalproperties,surfacemorphologyandopticalcharacteristicsofthematerialwereinvestigatedbymeansofdifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),atomicforcemicroscopy(AFM),andm-linestechnique.Usingthereflectiontechnique,thevalueoftheelectro-opticalcoefficientγ33wasmeasuredas11pm/Vatawavelengthof1310nm.AnEOswitchwithnanosecondresponsebasedonthismaterialhasbeenfabricated.
简介:嵌段共聚物聚苯乙烯-b-聚氧化乙烯(PS-b-PEO)甲苯溶液在室温下陈化2个月可形成中间是PEO单晶上下表面为PS具有"三明治"结构的方形片层,并且既能形成单层方形片层,也能形成多层方形片层.采用透射电子显微镜手段观察了这种结构在不同水含量的水/甲苯混合溶剂蒸汽诱导后形成的结构形貌.结果证明在甲苯和水蒸汽中,方形片层结构均能稳定存在,不能进行结构重构;而随着混合蒸汽中水含量的增加,单晶溶解、消失,在甲苯和水的共同作用下,可通过结构重构形成新的垂直或平行于表面的柱状相结构.