简介：AtheoreticalinvestigationonthepH-inducedswitchingofmixedpolyelectrolytebrusheswasperformedbyusingamoleculartheory.TheresultsindicatethattheswitchingpropertiesofmixedpolyelectrolytebrushesaredependentonthepHvalues.AtlowpH,negativelychargedchainsadoptacompactconformationonthebottomofthebrushwhilepositivelychargedchainsarehighlystretchedawayfromthesurface.AthighpHvalues,theinversetransformationtakesplace.TheroleofpHdeterminingthepolymerchainsconformationandchargebehaviorofmixedpolyelectrolytebrusheswasanalyzed.Itisfoundthatthereexistsamechanismforreducingstrongelectrostaticrepulsions:stretchingofthechains.TheH+andOH-unitsplayamoreimportantroleascounterionsofthechargedpolymersdo.ThecollapseofthepolyelectrolytechainsfordifferentpHvaluescouldbeattributedtothescreeningoftheelectrostaticinteractionsandthecounterion-mediatedattractiveinteractionalongthechains.

简介：Thehydrophilicityofsiliconehydrogelsusedassoftcornealcontactlensplaysanimportantroleinwearingcomfort.Inordertoenhancehydrophilicityandproteinresistance,siliconehydrogelmembranesweremodifiedbyatmosphericpressureglowdischargeplasma(APGDP)inducedsurfacegraftpolymerizationofN-vinylpyrrolidone(NVP)andpoly(oligoethyleneglycolmethylethermethacrylate)(PEGMA)inthispaper.XPSanalysisdemonstratedthesuccessofgraftpolymerizationofNVPandPEGMAontothesurfaceofsiliconehydrogelmembranes.Thehydrophilicityofsiliconehydrogelswascharacterizedbythemeasurementofwatercontactangle(WCA).TheresultshowedthatNVPgraftedsiliconehydrogelhastheWCAofabout68°andPEGMAgraftedsiliconehydrogelhasthelowestWCAofabout62°,whilethepristinesiliconehydrogelishydrophobicwiththeWCAofabout103°.Proteinresistanceofsiliconehydrogelswasinvestigatedbythemethodofbicinchoninicacidassayusingbovineserumalbumin(BSA)asamodel.It'sfoundthatthegraftedsiliconehydrogelhasasignificantimprovementofproteinresistance,andPEGMAgraftingismoreefficientforthereductionofproteinadsorptionthanNVPgrafting.ThesiliconehydrogelmembranesgraftedwithNVPandPEGMAaregoodcandidatesofsoftcornealcontactlenses.

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简介：Acyano-substituteddiarylethlenederivativeaggregation-inducedemission(AIE)dyewithtwoaminoend-groupsand4,4'-(hexafluoroisopropylidene)diphthalicanhydridewerefacilelyincorporatedintoredfluorescentorganicnanoparticles(FONs)viaroomtemperatureanhydridering-openingpolymerizationunderanairatmosphere.TheseobtainedRO-HFDAFONswerecharacterizedbyaseriesoftechniquesincludinggelpermeationchromatography,Fouriertransforminfraredspectroscopy,sizedistributionandzetapotentialmeasurements,UV-Visabsorptionspectrum,fluorescentspectroscopyandtransmissionelectronmicroscopy.BiocompatibilityevaluationandcelluptakebehaviorofRO-HFDAFONswerefurtherinvestigatedtoexploretheirpotentialbiomedicalapplication.WedemonstratedthatsuchFONsshowedhighwaterdispersibility,stableuniformsphericalmorphology(150-200nm),broadexcitationband(350-605nm),intenseredfluorescence(627nm)andexcellentbiocompatibility,makingthempromisingforcellimagingapplications.

简介：Inthepresentwork,theblendofpoly(butylenesuccinate)(PBS)andbisphenolA(BPA)waspreparedbysolutionmixing,andtheintermolecularinteractionsbetweenthetwocomponentswerecharacterizedbyacombinationofnuclearmagneticresonance(NMR)andFouriertransforminfraredspectroscopy(FTIR).Theresultsshowedthatintermolecularhydrogen-bondingformsbetweenthecarbonylgroupofPBSandphenolhydroxylofBPA.WiththeincreaseofBPAcontent,morehydrogenbondswereformed.TheeffectofhydrogenbondingonthecrystallizationbehaviorofPBSwasinvestigatedbydifferentialscanningcalorimetry(DSC)andpolarizedopticalmicroscopy(POM).TheresultsshowedthattheoverallisothermalcrystallizationkineticsandthespherulitegrowthrateofPBSdecreasewiththeincreaseofBPAcontent,whilethePBSspherulitesizeincreaseswithBPAcontent.

简介：Basedonthepremisethattheadditionofglassbeads(GB)couldhardlyinfluencethelinearviscoelasticityinlowfrequency(ω)regionforhomogeneouspolymersystems,thedynamicrheologicalbehaviorsofunfilledandfilledpoly(methylmethyacrylate)(PMMA)/poly(styrene-co-acrylonitrile)(SAN)blendswerestudiedinordertoexploretheeffectofGBonthephase-separationofbinarypolymermatrix.ResultsshowthatGBhasaninducedeffectonthephase-separation,whichembodiesthatthephase-separationtemperature(T_s)ofPMMA/SANblendfilledwithGBislowerthanthatoftheunfilledsystem.ThehighercontentofGB,thehigheristhe“secondaryplateau”ofωintheterminalregionofstoragemodulus(G')versusωplot.The“secondaryplateau”appearingintheterminalregionisattributedtothephase-separationofPMMA/SANblendsanditbecomesmoreflatforfilledpolymerblendsunderthesameconditions.However,itissuggestedthatthiskindof“inducedeffect”isrelatedtotheGBcontent;thehighercontentofGBparticlesmightenhancetheinteractionbetweentheparticlesandpolymermatrix.Moreover,itisfoundthattheadditionofGBalsohasaninfluencemoreorlessonthemorphologyanddomainsizeofpolymermatrix.Itisbelievedthattheplotofdynamicviscosity(η')versusthelossviscosity(η')issensitivetoexaminetheeffectinducedbyGBonthephase-separationofbinarypolymermatrix.

简介：与gigapores和meso-macropores包含层次bimodal毛孔结构的多孔的聚合物祷告(PPB)被导致聚合的阶段分离(果仁)和乳剂模板技术在一只杯子里准备毛状的microfluidic设备(GCMD)。制造过程由使乳化包含了water-in-oil乳剂的准备水的答案进包含porogen的单体答案。乳剂被增加进GCMD制作(water-in-oil)-in-water两倍乳剂微滴。搬运人的流动率连续阶段强烈影响了形成机制和微滴的尺寸。从滴下到微滴的jetting和尺寸转变的形成机制随搬运人的流动率的增加从550m减少了到250m连续阶段。准备微滴为聚合被开始由联机对形式PPB紫外照耀。因为从乳剂模板获得的porogen和gigapores的存在，在这些祷告的meso-macropores被果仁产生。毛孔形态学和PPB的毛孔尺寸分发被扫描电子显微镜学和水银侵入porosimetry(MIP)广泛地调查。因为在乳剂和搬运人的水阶段之间的不同osmolarities，新毛孔形态学在与传统的理论不同的祷告的边被形成连续阶段。bimodal毛孔结构的形态学和比例能被改变porogen的类型和数量调节。

简介：Agreenapproachtothesynthesisandmorphologicalcontrolofhighperformancepolyimidesandtheirnanohybridshish-kebabsinglycerolthroughreaction-inducedcrystallizationofnylon-salt-typemonomerswasreported.Crystallinepolyimidenanoplatescanbeobservedbydirectpolycondensationofpyromelliticacidwithvariouskindsofaliphaticoraromaticdiamines.Withtheexistenceofcarbonnanotubes,thepolyimidescanbesuccessfullydecoratedonthesurfaceofCNTsthroughareaction-inducedhetero-epitaxialcrystallizationprocess,andresultedinnovelpolyimide/CNTnanohybridshish-kebabs(NHSKs)structures.ThemorphologiesoftheNHSKscanbefine-tunedthroughchangingtheconcentrationofmonomersorthereactiontemperature,especiallythroughtheintroductionofdynamiciminechemistry,theformationprocessofNHSKscanbeattributedtoasoftepitaxymechanism.ThusagreenapproachforthesynthesisofhighperformancepolyimidesandtheirCNTbasednanohybridstructureswasexplored,whichshouldbeofgreatvaluefortheirapplicationsinhighperformancereinforcednanocomposites.

简介：两个都与高chemoselectivity介绍芳香、脂肪族的主要的氨基的组的一个一步舞过程被开发。三位字节州的丙酮从聚合电影底层的C-H契约和是积木和氨基的组搬运人的酚的O-H契约提炼氢原子。作为结果，二种自由激进分子，聚合物底层的限制的以碳为中心的链激进分子和活动以氧为中心的含苯氧基的激进分子，被产生。然后，公司契约被在这些二种自由激进分子之间的联合反应形成。p-Tyramine和p-aminophenol被用作氨基的搬运人。氨基的组的成功的介绍被水合同角度(CA)的大小表明到LDPE，BOPP和宠物电影底层上，紫外系列(紫外)，X光检查光电子光谱学(XPS)并且荧光灯显微镜学。处理因素p-tyramine和p-aminophenol的集中，和丙酮/水的比率例如紫外光的紧张和照耀时间，被调查。优化进程参数如下：紫外轻紧张9500W/cm2；为BOPP和LDPE的照耀时间18min，为宠物的22min；丙酮/水=的比率1；并且p-tyramine和p-aminophenol的集中15%为BOPP和LDPE，1%为宠物。基于紫外吸收度，聚合底层上的氨基的组被估计在6.3浥汵楳湯瀠汯浹牥穩瑡潩獮眠瑩?慣楴湯捩?湡潩楮?档牡敧?湩的范围吗？