简介：Tappingmodeatomicforcemicroscopehasbeenappliedtoobservesingle-chainPMMAparticleswhichwerestoredforsixmonthsatroomtemperatureaftersprayedfromverydilutesolutionsingoodsolvents,good/poormixedsolvents,andathetasolvent.Monodis-persePMMAstandardsofmolecularweightsrangingfrom7.90×10~4to1.3×10~6wereusedtoinvestigatetheeffectofmolecularweightohthesizeofthesingle-chainPMMAparticles.Thesesingle-chainparticlesshowedclosetosphericalshapes.Themorphologyofsingle-chainPMMAparticlesofagivenmolecularweightwasfoundtobeidenticalinspiteofdifferentsolventsusedforsolutionspraying.Molecularweighdependenceoftheparticledimensionwasalsofound.Thediametersofsingle-chainPMMAparticlesaftercorrectionoftlp-geometryeffectwerecomparedtothevaluesestimatedfrommolecularweightanddensity.

简介：有100，200和300祷告的链长度的单个聚合物链的结构的转变被平行temperingMD模拟调查。我们的模拟结果能与减少的温度从随机的卷捕获结构的变化到orientationally订的结构。清楚的转变作为温度的功能在旋转和全球orientational顺序参数P的半径的曲线上被观察，它表明了单个聚合物链的结构的形成。在旋转Rgx的方形的半径的三个部件之间的线性关系2，Rgy2，Rgz2并且全球orientational顺序P能在在结构上transformational过程下面被获得。在x之间的线性关系的斜坡(或Y轴)部件Rgx2(或Rgy2)并且P是否定的，当时Rgz，2作为P的功能是积极的。斜坡的绝对值与链长度成正比。一旦单个聚合物链拿随机的卷或订的配置，线性关系是无效的。conformational变化也在显微镜的规模上被分析。聚合物链能被当作由灵活的环连接的僵硬的茎的构造。从茎长度分发的指数地减少的行为的偏差变得突出，显示一链使硬产生导致与减少的温度处于trans状态结束的越来越多的片断。茎长度Ntr是大约21张契约显示聚合物链与特定的褶层长度被订。那么，模拟结果，显示出液体水晶的聚合物链的原型，是有用的理解水晶的聚合物的结晶化过程。

简介：Inthisstudywastoinvestigate,byphase-transfercatalysis,theactivityofsingleandmixedammoniumandphosphoniumsaltsgraftedona"gel-type"styrene-7%divinylbenzenecopolymerintheoxidationofbenzylalcoholwithhydrogenperoxide.Awidevarietyofcatalystswithdifferentquaternarygroupsanddifferentquaternarychainlengthsubstituentswereexamined.Theactivityofsingle"onium"saltsincreasesasaconsequenceoftheassociationofammoniumandphosphoniumsaltsgraftedonthesamepolymericsupport.Theactivityofpolymer-supportedammoniumandphosphoniumsaltsincreaseswiththenumberofcarbonatomscontainedinthealkylradicalsofthe-oniumandofthefunctionalizationdegreewithphosphoniumgroups.

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简介：Asystematicstudyonthesynthesisandantibacterialactivityofthequaternary"onium"saltsgraftedonaninsoluble"gel-type"stryene-7%divinylbenzenecopolymerbypolymer-analogousreactionsisshowed.Antibacterialactivityofquaternaryammoniumand/orphosphoniumsaltsgraftedonpolymer-supportshasbeenstudiedagainststaphylococcusaureusandEscherichiacoli.Awidevarietyof"onium"saltsboundtomacromolecularsupportswithdifferentquaternarygroupsanddifferentquaternarychainlengthsubstituentswereexamined.Theantibacterialactivityofmixed"onium"saltsincreasesasaconsequenceoftheassociationofammoniumandphosphoniumsaltsgraftedonthesamepolymericsupport.

简介：一篇小说溶剂敏感荧光灯有可逆性的致动器从碳点(CD)被获得了反的蛋白石，经由渗入CD答案进胶体的水晶模板的空隙被准备，CD材料的热聚合并且移开胶体的模板。同样准备的CD反的蛋白石致动器显示出75畭s的一个弯曲角度

简介：Theeffectofsinteringdispersedandbulk,lowmolecularweight(Mn=50,000Da),nano-emulsionpolytetrafluoroethylene(PTFE)particlesneartheirmeltingpointisdescribed.Withthenascentparticlesconsistingofca.75nmdiameter,hexagonal,singlecrystals,sinteringat,e.g.,350℃,results,initially,inmergerofneighboringparticles,followedbyindividualmolecularmotiononthesubstrateandtheformationoffoldedchain,lamellarsinglecrystalsandspherulites,andon-edgeribbons.Itissuggestedthesestructuresdevelop,withtime,inthemesomorphic'melt'.Sinteringofthebulkresinyieldsextendedchain,bandstructures,aswellasfoldedchainlamellae;end-surfacetoend-surfacemerger,possiblybyend-to-endpolymerization,occurswithincreasingtime.