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Hierarchical Self-Assembly Structures of POSS-Containing Polypeptide Block Copolymers  
Hierarchical Self-Assembly Structures of POSS-Containing Polypeptide Block Copolymers
资料类型: PDF文件
关键词: POSS  Nanocomposites  Self-Assembly  Polypeptide  
资料大小: 72K
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:
Inthisstudy,weusedacombinationofatomtransferradicalpolymerization,ringopeningpolymerization,andclickchemistrytosynthesizeneworganic/inorganicmacromolecularself-assemblingbuildingblocksofpolystyrene-trpoly(y-propargyl-l-glutamate-g-polyhedraloligomericsilsesquioxane)[PS-/r(PPLG-g-POSS)].TheincorporationofthePSandPOSSunitsenhancedthea-helicalconformationinthesolidstate,asdeterminedusingFouriertransforminfrared(FTIR)spectroscopyandwide-angleX-raydiffraction(WAXD).Hierarchicalself-assemblyofthePS-/r(PPLG-g-POSS)diblockcopolymers,whichwecharacterizedusingWAXD,small-angleX-rayscattering,andtransmissionelectronmicroscopy,ledtotheformationofcylindricalstructuresasaresultofmicrophaseseparationofthediblockcopolymer;thehexagonalcylinderpackingnanostructurefeatureda-helicalconformationsofpolypeptidesegments,whichwereorientedperpendiculartothedirectionofthecylindercolumnfromdiblockcopolymers;aggregationofthePOSSmoietiesinducedthepackingintohexagonallatticestructures.TheattachmentofPOSSunitsontothesidechainsofPPLGstabilizedthea-helicalsecondarystructuresatelevatedtemperature,relativetothoseofpurePPLGandPS-trPPLG,asdeterminedthroughtemperature-dependentFTIRspectroscopicanalyses.
作者: Y. C. Lin, S. W. Kuo
上传时间: 2013-06-26 14:55:47
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