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Construction of Dual Stimuli -responsive Microcapsules Their Controlled Encapsulation and Release Properties  
Construction of Dual Stimuli -responsive Microcapsules Their Controlled Encapsulation and Release Properties
资料类型: PDF文件
关键词: Microcapsules  Azobenzene  Photoresponsive  behavior  Controlled  release  
资料大小: 100K
所属学科: 分子表征
来源: 第六届亚欧研讨会上处理和性能增强聚合物会议文集(2013.6.2-6 武汉)
简介:
PAAmicrocapsuleswereobtainedthroughdistillationprecipitationpolymerizationandselectiveremovalofsilicatemplatesbyhydrofluoricacid(HF)etching.Theuniform,robust,monodispersemicrocapsules,confirmedbyTransmissionElectronMicroscopy(TEM)andScanningElectronMicroscope(SEM)investigation,hadreversiblephotoisomerizationwithtransformationbetweentransandcisisomersunderultraviolet(UV)andvisiblelights.UnderUVirradiation,azobenzenecrosslinkingsitestransformedfromtrans-tocis-isomer,whichwouldinducetheshrinkageofmicrocapsuleswithdensershellandinfluencetheirencapsulationandreleasebehaviors.AfterloadingwithRhodamineB,thereleasebehaviorswerecompletelydistinct.UndersingleUVirradiation,theshrinkageadjustedcapsulepermeability,providinganovelwaytoencapsulateRhBmolecules.Underalternatelightirradiation,maximalreleaseamountreachedduetocontinualmovementsofshellnetworksbycycle‘stransformationbetweentransandcisisomers.Also,microcapsuleshadabsolutepHresponsiveness.WithpHvalueincreasing,enhancedswellingeffectscausedbetterosmoticandafewmoreRhBmoleculesdiffusedoffmicrocapsules.Importantimplicationsofthisapproachareexpectedindevelopmentofphoto-controlledencapsulationandreleasesystemsaswellasinpH-sensitivematerialsandmembranes.
作者: X. T. Wang , X. T. Ye,Y. W. Hu, Z. H. Li,Z. F. Liu
上传时间: 2013-07-04 16:45:24
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