简介：阶段PVDF水晶结构和在先存在的阶段PVDF球粒以内的豌豆的结晶化上的豌豆的效果被光显微镜学OM，红外线的光谱学红外和扫描电子显微镜学SEM调查了。结果证明阶段PVDF球粒由展出高度弄弯的像滚动的形态学的lamellae组成并且在充满豌豆的混合优先地发展。与增加豌豆集中，滚动直径增加和滚动更好与对方被分开。豌豆在interspherulitic区域使第一结晶，transcrystalline层发展。随后，豌豆的transcrystalline层继续在阶段PVDF球粒以内成长，例如在在滚动之间的区域，直到在另外的豌豆transcrystalline层或球粒上侵犯。结晶化动力学结果显示在阶段PVDF的intraspherulitic区域的豌豆晶体的生长率与阶段PVDF的结晶化温度与豌豆，而是否定豌豆的内容显示出积极关联。

简介：PVDF的词法特征上的PBS的效果被光、原子的力量显微镜学在各种各样的条件下面调查了。整洁的PVDF在170戠?与非常地弱的birefringence形成大表格球粒，这被发现?M

简介：Ithasbeenwellknownthatfluorinatedpolyurethanesexhibituniquelylowsurfaceenergy,biocompatibilityandbiostability,thermalandoxidativestabilityandnonstickingbehavior.Consequently,thesepolymershaveattractedconsiderableinterest.However,themechanicalpropertiesoffluorinatedpolyurethanesusuallydeclinewithincreasingfluorinecontents.Theblendingoffluorinatedpolyurethaneswithnormalpolyurethanewascarriedouttoachievebalancedmechanicalandsurfaceproperties.Itwasfoundthatpolyurethanewithgoodmechanicalpropertiesandlowsurfaceenergycanbeobtainedbyaddingasmallamountoffluorinatedpolyurethane.Thefluorinatedsidechainscaneasilymigratetouppermostsurfacesoftheblendsuntillthefluorinelevelatthesurfacebecomesalmostsaturated.Ithasbeenshownfromcontactangle,XPSandAFMmeasurementsthatonlyaslittleas0.34wt%offluorinelevelisenoughtoproduceasurfacesaturatedwithfluorine,andthefluorinelevelattheuppermostsurfaceisonehundredtimeshigherthanthatintheblendbulk.Thefinaloutersurfacestructuresofthepolyurethaneblendwereindependentofthecontentofthefluorinatedpolyurethaneintheblendsduetothesurfacessaturatedbyfluorine.

简介：Anovelsmallband-gapconjugatedpolymer-poly[(3-acetylpyrrole-2,5-diyl)(4-dimethylaminobenzyliene)(3-aeetylpyrrolequinodimethane-2,5-diyl)](PAPDMABE)-anditsprecursorweresynthesizedbyasimplemethodandcharacterizedby1H-NMR,FT-IR,TGAandUV-VIS.ThepolymercanbedissolvedinstrongpolarsolventssuchasDMSO,DMForNMP.Theband-gapenergyofPAPDMABEwasfoundtobe0.95eV.Theconductivityofdopedproductswithiodinefallsintherangeofasemiconductor.``

简介：3-Ethynyl-4-（trimethylsilyl）thiophene（1a）and3-ethynyl-4-bromothiophene（1b）selectivelyundergoacetylenepolymerizationsinthepresenceoftheMoCl5-andWCl6-Ph3SiHcatalyststogivesoluble,high-molecular-weightpoly（thienylacetylenes）（2）（Mwupto602000）inhighyields（upto100%）.LighttransmissionspectraofTHFsolutionsof2continuouslyred-shiftwithincreasingconcentration.Theconcentratochromismshowsalogarithmicconcentrationdependence;thatis,theopticaltransitionsof2arepredictablytunablebysimplychangingtheirconcentrations.

简介：Poly(4-vinylpyridine)(P4-VP)nanofiberandfluoresentpoly(4-vinylpyridine)/porphyrin(P4-VP/TPPA)nanofiberwererespectivelypreparedbyelectrospinning.TheeffectoftheconcentrationofP4-VP/dimethylformamide(DMF)electrospinningsolutionsonthemorphologyofP4-VPnanofiberwasinvestigatedanditwasfoundthattheaveragediameterofthenanofiberofP4-VP/DMFincreasedwiththeincreaseoftheconcentrationofthespinningsolution.AftertheadditionofTPPAtotheP4-VP/DMFspinningsolution,thediameterofP4-VP/TPPAnanofiberbecameevenduetotheincreaseoftheconductivityoftheP4-VP/DMF-TPPAsolution.Thephotoluminescent(PL)spectralanalysisindicatesthattheemissionpeakpositionofP4-VP/TPPAnanofiberisalmostthesameasthatofpureTPPAatabout650nmwithoutpeakshift,andwhenitwasstoredfor20days,theemissionpeakofP4-VP/TPPAnanofiberisalsoat650nm,indicatingthatthefluorescentpropertyofP4-VP/TPPAnanofiberisstable.Fourier-transforminfrared(FTIR)spectrumconfirmsthechemicalcompositionoftheresultingP4-VP/TPPAcompositenanofiber.

简介：二氧化碳共聚物聚氨酯胺PUA与聚丙烯碳酸盐PPC被混合以便没有牺牲另外的机械性质，改进PPC的坚韧和灵活性。与纯PPC相比，有装载的5wt%PUA的PPC/PUA混合证明400%在裂缝在延伸增加，虽然相应让步力量象稍微显示出的33.5MPa和幼仔模量一样仍然保持高减少。在PPC/PUA的结合的相互作用混合的分子间的氢被FTIR，2D红外和XPS系列分析，和PUA的细微地驱散的微粒结构在PPC证实在SEM图象被观察，它为PPC的韧化的机制提供了好证据。

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简介：Bilayerhumidity-responsiveactuatorsaregenerallycomposedofactuatingandsupportinglayersofdifferentmaterialswithlargelydifferentwettability.Suchkindsofbilayeractuatorssufferfromlowadhesiveforcebetweenthetwolayersduringusage.Thisstudydemonstratesthepreparationofhumidity-responsivebilayeractuatorsthathavethesamematerialsintheactuatingandsupportinglayerstoavoidtheadhesiveissue.Thebilayeractuatorsconsistofaporouspoly(acrylicacid)σAA)/poly(allylaminehydrochloride)(PAH)layerandanonporousPAA/PAHlayerthatarefabricatedbyexponentiallylayer-by-layerassemblymethod.Atahigh/lowrelativehumidity(RH),thenonporousPAAIPAHlayercanefficientlyexpand/shrinkbyabsorbing/desorbingwaterwhilethevolumeexpansion/shrinkageoftheporousPAA/PAHlayerinanenvironmentwithchangedhumidityissignificantlysuppressedbythemicrometer-sizedpores.Thelargelydifferentexpansion/shrinkageofthenonporousandporousPAA/PAHlayerswhensubjectedtohumiditychangesenablesrapidandreversiblerolling/unrollingmotionsofthebilayeractuator.Thebilayeractuatorshowsafasterrollingspeedandalargerbendingcurvaturewhensubjectedtoalargerhumidityincrease.

简介：结晶化修正(vinylidene氟化物)(PVDF)poly为PVDF并且poly的混合电影(甲基methacrylate)(PMMA)被调查。集体crystallinity(c)并且进一步，阶段内容(PVDF的F())，与不同集体比率为asprepared混合电影被学习。另外，c和F的变化()一旦PMMA部件从相关混合系统被移开，系统地被探查。DSC，FTIR和XRD大小都显示了那1)c，F()并且甚至阶段的内容(F())与PMMA的增加减少了；2)与PMMA的抽取，c和F()当时，增加了F()减少。它是值得注意的c和F的增加()取决于提取PMMA(EPMMA)的相对数量，即，越多PMMA被移开，越多c和F()增加。这些结果从PMMA成分揭示阻碍者效果到PVDF的结晶化，并且因而，当PMMA被提取时，这限制将被释放。

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简介：明显的antiplasticizing效果与MOCA的小数量在PVC被观察了，3,3-dichloro-4,4-diamino-diphenylmethane。PVC/MOCA混合的PVC-MOCA相互作用和结晶化行为详细被调查包括直接存储器存取，FTIR，和DSC根据一系列技术解释antiplasticization的机制。有MOCA的5phr的PVC的张力的力量到达的机械性质测试表演的结果最大的价值，69.5Mpa，它比纯PVC的高是大约23%。在张力的力量的上升在由直接存储器存取大小证实了的PVC上被归因于MOCA的antiplasticizing效果。从FTIR的证据表明一个强壮的结合氢的相互作用在MOCA和PVC重复单位的methine质子发生在-NH2组的氮原子之间。DSC分析的结果显示MOCA的那结晶化行为完全被压制，PVC的crystallinity随MOCA数量的增加减少。

简介：在这篇论文，我们为极端夸张操作员的力量构造Almansi分解。构造将以一个建设性的方法被做。

简介：Lamellarcrystalsofdiblock,triblockandfour-armpoly(ethyleneglycol)-b-poly(ε-caprolactone)(PEG-b-PCL)crystalline-crystallinecopolymersweresuccessfullyobtainedfromtheirsolution.Morphologyandstructureoflamellarcrystalsofcrystalline-crystallinecopolymerswereinvestigatedusingtapping-modeatomicforcemicroscopy(AFM)andselectedareaelectrondiffraction(SAED).Allofthesesamplesshowedthetruncated-lozengemultilayerbasalshapeswithcentralscrewdislocationorcentralstack,whichwereallobtainedsimultaneouslyfromtheoilbath.ThediffractionpatternofPEGblocklamellarcrystalisattributedtothe(120)diffractingplanesandthepatternofPCLblocklamellarcrystalisattributedtothe(110)diffractingplanesand(200)diffractingplanesaccordingtotheSAEDresults.Four(110)crystalgrowthplanesandtwo(200)crystalgrowthplanesarediscoveredforthePCLblocks,butthe(120)crystalgrowthplanesofPEGblocksarehidedinthefigureofAFM.Thecrystallinestructureofthefour-armcopolymers(FA)ismoredisorderandconfusedthanthatofthediblock(DI)copolymerandthestriatedfoldsurfacestructuresoflamellarcrystalsoffour-armcopolymers(FA)aresmootherthantheseoflinearanalogues,owingtotheconfusedcrystallizationofblockscausedbythemutualrestrictionofblocksandthehindranceofthedendriticcores.Inaddition,theaspectratioofFAisgreaterthanthatoftheothers.Itishypothesizedthattherearetworeasonsforthechangeofaspectratios.First,the(200)diffractingplanesofPCLcrystalsgrewslowlycomparedtotheir(110)diffractingplanesbecauseofdifferenceintheenergybarrier.Secondly,edgedislocationsonthe(200)diffractingplanesarealsoresponsibleforthevariationoftheaspectratio.Consequently,thecrystallinedefectsareaugmentedbythecompetingblockscrystallizedsimultaneouslyandthehindranceofthedendriticcores.

简介：Inordertoimprovetheflexibilityofpoly(propylenecarbonate)(PPC),poly(1,2-propylenesuccinate)(PPSu)wasusedtoplasticizePPCinabatchmixer.TheeffectsofPPSuonthemiscibility,thermalstability,mechanicalandrheologicalpropertiesoftheblendswereinvestigated.PPCwaspartiallymisciblewithPPSu.ItwasdemonstratedthatPPSudecreasedtheglasstransitiontemperatureandmeltviscosityofPPC,asshownintheDSCandrheologicalcurves.WiththeincreaseinPPSucontent,thePPC/PPSublendsshoweddecreasedtensilestrength,however,theelongationatbreakwasincreasedto1100%forthe70/30PPC/PPSublend.TheintroductionofPPSuprovidedanefficientandnovelplasticizationmethodtoextendtheapplicationareaofPPC.

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简介：Poly（aryleneetherdiketone）swerepreparedbythearomaticnucleophilicdisplacementreactionof4,4’-difluorobenzilwithdifferentbisphenolsinthepresenceofan-hydrouspotassiumcarbonateindiphenylsulfoneatelevatedtemperature.Thepolymersobtainedhadinherentviscosityof0.51～0.63dL/g,andexhibitedglasstransitiontemper-aturerangingfrom136～217℃mainlydependingonthebisphenolsusedinthepolymersynthesis.Thermogravimetryofthesepolymersshowedexcellentthermalstability,indi-catingthat10%weightlossesofthepolymerswereobservedintherangeabove428℃and438℃inairandnitrogen,respectively.ThemechanicalpropertiesofthesepolymerswerealsodescribedandthepermeabilityoffivepolymersforH2,O2andN2wasdeterminedat30℃.

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