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Electrosyntheses of freestanding and conducting poly
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2006-02-15 00:00 1347閱讀次數(shù)
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Electrosyntheses of freestanding and conducting poly
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Electrosyntheses of freestanding and conducting poly- Electrosyntheses of freestanding and conducting poly[詳細(xì)]
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2006-02-15 00:00
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- Amphiphilicdiblockcopolymersweresynthesizedbasedonpoly(2-ethyl-2-oxazoline)(PEtOz)asahydrophilicblockandaliphaticpolyesterssuchaspoly(L-lactide)(PLA)orpoly(-caprolactone)(PCL)asahydrophobicblock.Theirmicellarcharacteristicsinanaqueousphasewereinvestigatedbyusingdynamiclightscatteringandfluorescencetechniques.Theblockcopolymersformedmicellesintheaqueousphasewithcriticalmicelleconcentrations(cmcs)intherangeof1.0-8.1mg/L.Thecmcvaluesbecomeloweruponincreasingthelengthofthehydrophobicblock.Themeandiametersofthemicelleswereintherangeof108-192nm,withanarrowdistribution.Ingeneral,themicellesizeincreasedasthehydrophobicPLAorPCLblockbecamelarger.Thepartitionequilibriumconstants,Kv,ofpyreneinthemicellarsolutionsoftheblockcopolymerswerefrom1.79105to5.88105.ForeachblockcopolymersystemofPEtOz-PLAorPEtOz-PCL,theKvvalueincreasedasthelengthofthehydrophobicblockincreased.Thesteady-statefluorescenceanisotropyvalues(r)of1,6-diphenyl-1,3,5-hexatriene(DPH)were0.265-0.284inPEtOz-PLAsolutionand0.189-0.196inPEtOz-PCLsolution.TheanisotropyvaluesofPEtOz-PLAswerehigherthanthoseofPEtOz-PCLs.Theanisotropyvalueswereindependentofthelengthofthehydrophobicblockwhenthechemicalstructuresofthehydrophobicblockswereidentical.ThemicellesunderwenthydrogenbondingatpH<3.5withpoly(acrylicacid),whichproducedpolymercomplexprecipitatesthatcouldbereversiblydispersedasmicellesatpH>3.8.[詳細(xì)]
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2024-09-10 23:05
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- Investigation of the Hydration of Nonfou領(lǐng) Material Poly（ethylene glycol） by Low-Field Nuclear Mag
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2018-08-16 10:00
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- Injectable hydrogels with in situ-forming hydrophobic domains: oligo(D,L-lactide) modified poly(olig
- Injectable,insitu-gel領(lǐng)nanostructuredhydrogelshavebeenpreparedfromhydrazideandaldehydefunctionalizedpolymerprecursorsbasedonacopolymerofoligo(ethyleneglycol)methacrylate(OEGMA)andanoligo(lacticacid)macromonomer(OLA)withvaryinglacticacidchainlengths.Theresultinghydrogelscontainamixofchemical(hydrazonebondformationbetweenhydrazideandaldehydegroups)andphysical(hydrophobicinteractionsbetweenOLAchains)cross-linkswhichformcompetitivelyasafunctionoftheOLAchainlengthanddensity.AnincreaseintheOLAchainlengthanddensityresultsintheformationofmorephysicalcross-linksandfewerchemicalcross-links.Tuningtherelativeprevalenceofphysicalandchemicalcross-linkformationfacilitatedlargelyindependenttuningofgelmechanicsrelativetogelswel領(lǐng)anddegradation.Small-angleneutronscatteringoftheseOLA-containinghydrogelsrevealsamicrostructureconsistingofassociativehydrophobicdomains,basedonanincreasedscatteringintensityanddecreasedblobsizerelativetothatobservedforPOEGMAhydrogelspreparedwithouttheOLAco-monomer.ThepresenceofhydrophobicOLAdomainsincreasestheuptakeandslowsthereleaseofbovineserumalbumin,aproteinwell-knowntoassociatewithhydrophobicdomains.Coupledwiththeobservedcytocompatibilityofthereactiveprecursorpolymersusedtopreparethehydrogels,weanticipatesignificantpotentialapplicationsofthesehydrogelsfortheprolongedreleaseofhydrophobiccargoes.[詳細(xì)]
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2018-08-31 10:11
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