简介：PLAispresentlyconsideredasthemostattractivecompoundfortemporarytherapeuticapplicationinthebiomedicalfield.Inthispaperwegiveanoverviewofthepresentknowledgeonthedegradationbehavior,processingtechnologyofPLAanditsapplicationinthefixationofbonefracture.

简介：Threekindsofcommercialactivatedcarbons,suchasNoritRB1,MonolithandChemvironactivatedcarbons,wereusedasadsorbentsforadsorptionofdibenzofuran.Theaverageporesizeandspecificsurfaceareaoftheseactivatedcarbonsweremeasured.TemperatureProgrammedDesorption(TPD)experimentswereconductedtomeasuretheTPDcurvesofdibenzofuranontheactivatedcarbons,andthentheactivationenergyfordesorptionofdibenzofuranontheactivatedcarbonswasestimated.TheresultsshowedthattheChemvironandtheNoritRB1activatedcarbonmaintainedhigherspecificsurfaceareaandlargermicroporeporevolumeincomparisonwiththeMonolithactivatedcarbon,andtheactivationenergyforthedesorptionofdibenzofuranonthesetwoactivatedcarbonswashigherthanthatontheMonolithactivatedcarbon.Thesmallertheporeoftheactivatedcarbonwas,thehighertheactivatedenergyofdibenzofurandesorptionwas.

简介：AhighMwofPLLAwassynthesized,itintendedtobeusedinthemanufactureofbioabsorbablescrewappliedinbonefractureinternalfixation.Theopticalreactionconditionshavebeendiscussed.

简介：高密度聚乙烯(HDPE)的薄墙样品经由注射塑造，不同注射速度从100mm/s到1200mm/s被准备。在张力的力量和幼仔模量的重要减少与增加注射速度被观察。为了在这后面调查机制，减少，取向，分子的重量，分子的重量分发，融化流动率，crystallinity和水晶HDPE的形态学用二维的宽角度的X光检查衍射(2D-WAXD)被描绘，胶化浸透层析(GPC)，毛状的电流测定和微分扫描热量测定(DSC)分别地。这被表明取向，分子的重量，分子的重量分发，融化流动率和crystallinity没与增加有明显的变化注射速度。不过，扩大的链晶体的内容或大合拢的链晶体被发现与增加注射速度减少。因此，在张力的性质的减少被扩大的链晶体或大合拢的链晶体的减少的内容主要贡献，这被结束。这研究为高速度注射塑造的申请向工业提供珍贵信息。

简介：Inthispaper,sixkindsofactivatedcarbonssuchasAg^+-activatedcarbon,Cu^2+activatedcarbon,Fe^3+-activatedcarbon,activatedcarbon,Ba^2+-activatedcarbonandCa^2+activatedcarbonwereprepared.Themodelforestimatingactivatedenergyofdesorptionwasestablished.Temperature-programmeddesorption(TPD)experimentswereconductedtomeasuretheTPDcurvesofn-hexanolandthenestimatetheactivationenergyfordesorptionofn-hexanolontheactivatedcarbons.Resultsshowedthattheactivationenergyforthedesorptionofn-hexanolontheAg^+-activatedcarbon,theCu^2+-activatedcarbonandtheFe^3+-activatedcarbonwerehigherthanthoseofn-hexanolontheactivatedcarbon,theCa^2+-activatedcarbonandtheBa^2+-activatedcarbon.

简介：Newacetylenemonomers,6-{[(1-naphthylethynyl-4-phenyl)carbonyl]oxy}-l-phenyl-l-hexyne(1),2,5-diethynylthiophene(3),and4,4′-diethynylbiphenyl(6)weresynthesized.Homopolymerizationof1andcopolycyclotrimerizationsof3and6with1-heptyneandl-octynehavebeenachievedwithWCI6-andTaC15-Ph4Sncatalysts,respectively,givingsolublelineardisubstitutedpolyacetylene(2)andhyperbranchedpolyarylenes(5and8)withhighmolecularweights(upto1.2×105)inhighyields(upto98%).ThestructuresandpropertiesofthepolymersarecharacterizedandevaluatedbyIR,NMR,TGA,UV,photoluminescence(PL),andelectroluminescence(EL)analyses.Allthepolymerspossesshighthermalstabilityandemitstrongbluelightuponphotoexcitation.Theintensityoftheemittedlightisgreaterthanthatofpoly(1-phenyl-1-octyne),awell-knownhighlyluminescentdisubstitutedpolyacetylene.Littleaggregation-inducedredshiftinthePLwasobservedinthethinfilmsofthepolymers.Byconstructingamulti-layerELdevice,highELquantumyield(0.18%)hasbeenachievedin2,whicharethebestresultsforsubstitutedpolyacetylenesattainablesofar.

简介：Heat-resistantsiliconegelsweresynthesizedbyreplacingthesinglemainchainpolymethylhydrosiloxanewithreactiveladderlikepolyhydrosilsesquioxanecopolymers.Becauseoftheinteractionbetweenpolydimethylsiloxanechainsandtheladderlikepolysilsesquioxaneschains,thecyclizationofthepolydimethylsiloxanechainsishindered.Thehighthermalstabilityoftheladderlikepolymerscanimprovethethermalstabilityofthesiliconegelswithoutsacrificingtheirgoodcomprehensiveproperties.

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简介：Inthisarticle,AHPS(3-allyloxy-2-hydroxy-1-propanesulfonatesalt)wassynthesizedtouseinemulsifier-freeemulsionpolymerizationofBA/BMA/MMAsystemforhighsolidcontentlatexes.Storagestability,flowbehaviorofthelatexes,morphologyoftheobtainedlatexparticles,dynamicviscoelasticbehavior,tensilestrengthandwaterresistancepropertiesoftheresultedcopolymerswereinvestigated.TheexperimentalresultsshowthatwiththeadditionofAHPS,stabilityoftheemulsionisgreatlyimprovedthatthereappearsnoapparentprecipitationduringthepolymerizationandstorageatroomtemperaturefor6monthsandat-10℃forfourmonths.FlowofthelatexesfollowstheBinghambodylaws,diameterofthelatexparticlesisabout0.6μm,ofwhichislargerthanthatofbyconventionalemulsionpolymerization(0.12μm).Inaddition,notonlywaterresistanceofthecopolymersobtainedbyemulsifier-freeemulstionpolymerizationisgreatlyimproved,butalsotensilestrengthisobviouslyenhanced.

简介：Twoseriesofinterpenetratingsulfonicacidresins（ISAR）,10×nandn×10,werepreparedbymeansofthewetmethod,andthephysicochemical,thermodynamicandkineticpropertiesoftheISARweremeasured.Theresultsshow:10×nresinsexhibitbetterpropertiesthann×10ones,mainlyinhigherapparentdegreeofcrosslinkingandlargerconformationalentropyeffect,amongwhich,10×1resinexhibitsthebestthermodynamicandkineticproperties.IntheDTAgraphsofn×10resins,therearetwoTgandtwoTox,butinthoseof10×n,onlyoneTgandoneTox.Thisresultwellsupportstheconclusionthat10×nresinshavemuchbetterinterpenetratingstructuralaspects.

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简介：AnewtypeofSiO_2-MgO-CaO(SMC)whiskerwasusedtomodifyhighdensitypolyethylene(HDPE).Themeltingbehaviorandcrystallinitywereinvestigatedbydifferentialscanningcalorimetry(DSC).ThedispersionofwhiskersandinterfacialadhesioninthepreparedHDPE/SMCwhiskercompositeswereinvestigatedbyscanningelectronmicroscopy(SEM).Themechanicalpropertieswereevaluatedbymechanicaltestsanddynamicmechanicalanalysis(DMA).DSCdataindicatedthatthemeltingtemperatureandthecrystall...

简介：新奇的肼单体，pyridine-2，6二度((4-aminophenyl)thioureido)羰基(PATC)高效地被综合并且有各种各样的芳香的dianhydrides的polymerized。因而，(pyridinethiourea-imide)poly，有好热性质的s(PPTI)和火焰retardancy被制作。PATC和PPTI的结构被FTIR描绘，<啜class=“a-plus-plus”>1H-NMR，<啜class=“a-plus-plus”>13与元素的分析，crystallinity，organosolubility，固有的粘性和胶化浸透一起的C-NMR光谱学色析法的大小。包含C=S，CONH和元的PPTI在聚合物脊梁代替了pyridine一半显示出非结晶的自然并且在高度极的器官的溶剂并且甚至在象tetrahydrofuran(THF)那样的不太极的溶剂是容易地可溶的。聚合物在0.911.16dL/g的范围有固有的粘性，分子的重量在6800077000g/mol之间被发现。PPTI的电的性质以在频率的一个范围上经常的电介质被估计。他们的热稳定性被在范围发现的10%重量损失温度决定519563在组之中未改变。1/1-sGC子单元的蛋白质层次从中年的比较w相?盼?盼在RCC被减少吗？？

简介：Adetailedstudywasperformedonthecrystalstructuresofpan-milledhigh-densitypolyethylene(HDPE)usingdifferentialscanningcalorimetry(DSC)andX-raydiffraction.ThecrystallinityofHDPEfirstdecreasedslightly,followedbyagradualincreasewithincreasingmillingtimes.Monocliniccrystalsappearedafter4cyclesofmilling.Withincreasingtimesofmilling,theproportionofmonocliniccrystalsincreasedsignificantlywhiletheproportionoforthorhombiccrystalsdecreasedgradually.Withincreasingtimesofmilling,thecrystallitesizeoforthorhombicformdecreasedgreatly,whilethesizeofmonocliniccrystalliteskeptalmostconstantduringmilling.

简介：Polymernanoparticleswerepreparedinthemethylmethacrylate(MMA)/butylmethacrylate(BA)emulsioncopolymerizationprocessbyamodifiedmicroemulsioncopolymerizationmethod.2-Hydroxyethylmethacrylate(HEMA),acrylate(AA)andmethylacrylate(MAA)wereusedasreactivecosurfactants.Withthisprocesshighpolymer:surfactantweightratios(40:1orgreater),relativelyconcentrated(～30wt.%)latexesandsmall(～60nm)particlediameterswereobtained.PropertiesofthelatexeswerecharacterizedbyTEM,DSC,dynamiclightscattering,andIRspectroscopy.

简介：Carbazole-basedbi-functionalphotorefractivepolyacrylateswerepreparedviafreeradicalpolymerizationandpost-azo-couplingreaction.ThestructureofpolymerswascharacterizedbyFouriertransforminfraredspectroscopy(FTIR)andprotonnuclearmagneticresonance(1H-NMR)spectroscopy.Thedifferentialscanningcalorimetry(DSC)andthethermalgravimetricanalysis(TGA)wereusedtocharacterizethethermalpropertyofpolymers.Theresultsindicatethatthoughtheglasstransitiontemperature(Tg)ofpolymersincreaseswithincreasingtheratioofNLOgroups,thepolymerswithdifferentratiosofNLOgroupsstillallshowlowglasstransitiontemperaturesaround60°C,andgoodthermalstability,whicharefavorabletothepracticalapplicationofthesepolymers.Thegelpermeationchromatographic(GPC)resultindicatesthatthesepolymersallhavehigh-molecular-weightwhichisfavorabletothelongtermstabilityofthematerial.Further,thesepolymershavegoodsolubilityinchloroformsolvent,andthesolutionscaneasilybefabricatedintoopticallytransparentfilms.Gaincoefficientsof75cm-1,185cm-1and66cm-1canbeobservedatzeroexternalelectricfieldwithoutanyadditionagentorpre-polingforpolymersP-2,P-3andP-4respectively.ThedifferentcontentsofNLOgroupsresultinthedifferentpropertiesofpolymersP-2,P-3andP-4.

简介：Theisotropyoranisotropyinsomephysicalpropertiesoftheammorphouspoly(ethyleneterephthalate)filmsuniaxiallydrawnattemperaturesaboveitsT_gandthenquenchedtoroomtemperaturehavebeenstudied.Experimentalresultsherepresentedshowthatthisamorphousstateofhighglobalchainorientationbutnearlyrandomsegmentalorientation,theGOLRstate,isnearlyisotropicinrefractiveindicesandYoung’smodulusforsmalldeformation,whileitisveryprobablyanisotropicinthermalconductionandmicrowavedielectricproperties.

简介：Thestrategyofsequentiallyspin-coatingaperovskitefilmfromtheperovskiteprecursorandanelectrontransportinglayerof[6,6]-phenyl-C71-butyricacidmethylester(PC71BM)isdevelopedtosimplifythefabricationprocedureofperovskitesolarcells.X-raydiffractionandscanningelectronmicroscopyindicatethatPC71BMfilmonperovskitelayercanretardtheevaporationofdimethylsulfoxide（DMSO）efficiently,thusprolongingthetransformationofintermediatephasetoperovskitecrystals,leadingtoahighqualityperovskitethinfilm.Thesolarcellswiththestructureofindiumtinoxides（ITO）/poly（3,4-ethylenedioxythiophene）:poly（styrenesulfonate）（PEDOT:PSS）/CH3NH3PbI3/PC71BM/bathocuproine（BCP）/Agmadefromthissimplifiedmethodexhibitahigherefficiency（12.68%）thanthosefromtheconventionalone-stepmethod（9.49%）.

简介：有在粒子的核心的高carboxyl内容的没有肥皂的吸水恐水病的核心壳乳胶粒子经由播种乳剂被综合聚合使用甲基methacrylate(MMA)，丁基acrylate(BA)，甲基丙烯酸(MAA)，苯乙烯(圣)和乙烯乙二醇dimethacrylate(EGDMA)作为单体，并且在聚合，粒子尺寸和形态学上在核心准备使用的MMA内容的影响被传播电子显微镜学调查，动态轻散布结果证明播种乳剂聚合能用当在核心准备的MAA内容是时，喂过程的饥饿的单体顺利被执行平等者到或不到24wt%，并且有恐水病的PSt壳的吸水的P(MMA-BA-MAA-EGDMA)核心的包含的效率随MAA内容的增加减少了。当有中等极性的P(MMA-MAA-St)的夹层在P(MMA-BA-MAA-EGDMA)核心和PSt壳之间被插入时，井在核心准备与24wt%MAA内容设计了没有肥皂的吸水恐水病的核心壳乳胶粒子被获得。

简介：Usingsupportedmulti-componentzincdicarboxylatecatalyst,poly(1,2-propylenecarbonate-co-1,2-cyclohexylenecarbonate)(PPCHC)wassuccessfullysynthesizedfromcarbondioxide(CO_2)withpropyleneoxide(PO)andcyclohexeneoxide(CHO).Theconversionofepoxidesdramaticallyincreasedupto89.7%(yield:384.2gofpolymerpergofZn)withincreasingreactiontemperaturefrom60℃to80℃.Theoptimizedreactiontemperatureis80℃.Thechemicalstructure,themolecularweight,aswellasthermalandmechanicalpropertiesoftheresultingterpolymerswereinvestigatedextensively.WhenCHOfeedcontent(mol%)islowerthan10%,thePPCHCterpolymershavenumberaveragemolecularweight(M_n)rangingfrom102×10~3to202×10~3andmolecularweightdistribution(MWD)valuesrangingfrom2.8to3.5.Incontrasttopoly(propylenecarbonate)(PPC),theintroductionofsmallamountofCHOleadstoincreaseintheglasstransitiontemperaturefrom38.0℃to42.6℃.Similarly,themechanicalstrengthofthesynthesizedterpolymerisgreatlyenhancedduetotheincorporationofCHO.TheseimprovementsinmechanicalandthermalpropertiesareofimportanceforthepracticalapplicationofPPC.