TOWARD AMPHIPHILIC DIBLOCK COPOLYMERS BY RAFT. KINETIC STUDY ON PH RESPONSIVE POLYMERS

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2018-08-31 10:11 629阅读次数

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• TOWARD AMPHIPHILIC DIBLOCK COPOLYMERS BY RAFT. KINETIC STUDY ON PH RESPONSIVE POLYMERS

  Reversibleadditionfragmentationtransfer(RAFT)belongstothegroupofthecontrolledradicalpolymerization(CPR)methods,intensivelyemployedinthesynthesisofpolymerswithcomplexarchitecturesandstructures.1,2pHresponsiveamphiphiliccopolymerssynthesizedbyRAFT,leadtomaterialswithversatileproperties.OptimizationofthereactionkineticsduringRAFTpolymerizationof2-(dimethylamino)ethylacrylate(DMAEA)inN,Ndimethylformamide(DMF)wasinvestigatedinthisstudy,followedbythesynthesisofDMAEA/styreneamphiphilicdiblockcopolymers,usingAutomaticContinuousOnlineMonitoringofPolymerizationreactions(ACOMP).Poly(DMAEA)isapHsensitivepolymerwithwideapplicationsinpharmaceuticalandwatertreatmentindustriesyetchallengingduetopossibleinteractionofitsaminogroupwithcatalysts.[详细]

  2018-08-31 10:11

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• Synthesis and Micellar Characterization of Amphiphilic Diblock Copolymers Based on Poly(2-ethyl-2-ox

  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.[详细]

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