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Dołączył: 26 Paź 2010
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Temat postu: Tory Burch Shoes Styrene methyl methacrylate and |
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Styrene / methyl methacrylate and styrene / methyl acrylate (β-hydroxy ester) block copolymer on the surface moving
HESURFACE0F0CKC0PoLYMERPANJiayu,[link widoczny dla zalogowanych], LUYingxian,[link widoczny dla zalogowanych], DENGZhuo, QiuKunyuan (Departm ~ ztofPolymer & ... andEngineering.CCh ~ istryandMolecularEngin ~ ring.PekingUniversity.Beiiing100871) AbstractThereorientationofsegmentsonthecopolymersurfacewithchangeofimmersionmediumhavebeeninvestigatedbydynamiccob_tactangle (DCA) measurements. ThesamplesareamphiphiliccopolymerPS-b ・ rPMAAorPS-b ・ rPHPMApreparedbypolymerizedMAAorHPMAmonomerwithpolystyrenemacroinitiatforcontainingazogroup. Theresultsshowthatthereorientationofpolarsegments (PMAAorPHPMAsegments) onthesurfacecontributetothecontactanglehysteresis. TherecedingangleisverysensityvetopolarityandmobilityofthesegmentsoncopolymersurfacewhileadvancingangleremainsatanapproximatevalueforthesamplesonwhichsurfacePSsegmentenrichmenttookplace,[link widoczny dla zalogowanych], sotheAO, adifferencebetweenadvancingangleandrecedingangle, canbeusedasanindicationofreorientationabilityofsegmentsand / orgroupsonthecopolymersurfaceThevaluesofadvancingangleorofrecedinganglemeasuredinthesecondimmersioncyclearesameasthatinthefirst, respectively,[link widoczny dla zalogowanych], thisrevealsthatthereorientationofsegmentsand / orgroupsarereversiblewiththeenvironmentalchangeinthecaseofbothPS-b-PMAAandPS-b-PHPMA. Theresultsalsoshowthatthecontactanglehysteresisdependontemperatureofmedium, ie. , Thevaluesofboth0andAOdecreasewithincreasingoftemperature, andthatdynamicbehavioroftheamphiphiliccopolymerscanbeaffectbytherratioofsequencelength (MPS / MPMAAorMPs / MMA) inthemacromolecularchain. KeywordsAlnphiphiliccopolymer, Dynamiccontactangle, ReorientationofsegmentsoilSErface
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