简介：Forasystemofflexiblepolymermolecules,theconceptsoftwoconcentrations,namelythesegmentalandthemolecularconcentrations,havebeenproposedinthispaper.Theformerisequivalenttothevolumefraction.Thelattercanbedefinedasthenumberofthegravitycentersofmacromoleculesinaunitvolume.Thetwoconcentrationsshouldbecorrelatedwitheachotherbytheconformationalfunctionofthepolymerchainandshouldbediscussedindifferentthermodynamicequations.OnthebasisoftheseconceptsithasbeenprovedthattheFlory-Hugginsentropyofmixingshouldbetheresultofthemixing'idealgasesofthegravitycentersofmacromolecules'.Thegeneralcorrelationbetweenthefreeenergyofmixingandthescatteringfunction(structuralfactor)ofpolymerblendshasbeenstudiedbasedonthegeneralfluctuationtheory.WhentheFlory-Hugginsfreeenergyofmixingisadopted,thedeGennesscatteringfunctionofapolymerblendcanbederived.

简介：Thetechnologyofactivationbyaddingfewactivators(<1%)toincreasetheamountofblendsincementwasinvestigated.Theresultsshowthatouteractiva-tionhasaremarkableeffectonimprovingthephysicalpropertiesofslagcement,flyashcementandvolcaniccement.Forexample,thecompressivestrengthwasincreasedby5-10MPa.Morever,theapplicationofactivationisbeneficialtogrind-aiding,earlystrengthandwater-reducingetc.

简介：Starchmodifiedpolyurethane(St-PCL)wassynthesizedviachemicalmodificationofcornstarchwithhexamethylenediisocyanateterminatedpolycaprolactone.TheobtainedSt-PCLwithdifferentgraftingrateswasusedascompatibilizerofstarch/polycaprolactone(St/PCL)blend.ThestructureofSt-PCLwasconfirmedbyFTIR,andthegraftingratecouldreachashighas64%.Inaddition,alowerSt-PCLamountcaneffectivelyimprovethecompatibilityofSt/PCLblends.Andthethermal,mechanicalandhydrophobicpropertiesofSt/PCLblendscouldbetailoredbytheamountofSt-PCL.

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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

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简介：用树脂分的在结构上多样的bispropargyl醚，quinol，4,4-dihydroxy联本基，bisphenol--A，4,4-dihydroxydiphenyl酉同类，4,4-dihydroxydiphenylsulphone，trimethylindanebisphenol和tetramethylspirobiindanebisphenol被使用阶段转移准备催化剂。综合材料独立在鼹鼠比率(0.5:0.5)与4,4-bismaleimidodiphenyl甲烷(BMIM)被混合。材料热地被治好，结构的描述和这些cross-linked材料的热性质用Fourier变换被调查红外线(FTIR)分光光度计和thermogravimetric分析器(TGA)。在不同材料之中，调查polyMRPE，polyMBPEBPA和polyMSPE显示出300諟?牦的更高的发作降级温度吗？

简介：Thetransitionbehaviouroftheblendsofisotacticpolypropylene(i-PP)withethylene-propyleneterpolymer(EPDM)containing42wt%propylenewasinvestigatedbydynamicmechanicalanalysistechnique(DMA).Owingtoitshighpropylenecontent,EPDMiscompatiblewithi-PPtosomedegree.Theinteractionbetweenthetwocomponentswasstrengthened.Asexpected,forpartiallycompatiblesystemtheglasstransitiontemperatureofi-PPintheblendsshiftedtolowertemperature.Itwasfoundthatthereexistedtwotransitions,αEPDMandβEPDM,fortheEPDMusedinthiswork.TheformerwasconsideredtobetheglasstransitionoftherandomchainsegmentsofEPDM,whilethelatterthelocalmotionofthelongethylenesequencesinEPDM.TheunusualtransitionbehaviourofαEPDMintheblendswasexplainedintermsofthegreaterthermalexpansionofEPDMandthecompatibilityofthetwocomponents.Ontheotherhand,theβEPDMchangedwiththecompositionoftheblendsinaregularmanner.

简介：Lowcyclefatiguecrackpropagation(FCP)behavioroftwoPC/ABSblendswithaweightra-tioofPCtoABSbeing80/20and60/40,respectively,isinvestigated.Experimentsarecarriedoutbyusingstandardcompacttension(CT)specimens.Thefracturesurfacesareexaminedwithascanningelectronmi-croscope(SEM).ItisshownthattheFCPresistanceofPC/ABSblendwith20%ABSparticlesishigherthanthatofPC/ABSblendwith40%ABSparticles.ItisfoundthatproperABSparticlecontentcanresultinthetougheningofPC/ABSblendsthroughparticlecavitationandshearyieldinginmatrix.

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简介：TheeffectsofHDPEmatrixtoughnessonthebrittle-ductiletransitionofHDPE/CaCO3blendsareinvestigated.NotallHDPEcanbetoughenedbyCaCO3particles.TheabilityofthematrixtoyieldplaysafundamentalroleindetermingwhetherHDPEcanbetoughenedornot.Thereexistsacriticalmatrixtoughness(Isc≈45J/m)belowwhichHDPEcannotbetoughenedobservablybyCaCO3particleatgivenaveragesize,andabovewhichthecriticalmatrixligamentthickness（τ?）isproportionaltomatriximpactstrength.

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简介：Theconformationalanddynamicpropertiesofpolypropylene(PP)forbothpuremeltsandblendswithdifferentchaintacticitywereinvestigatedbyMonteCarlosimulationofisotactic(iPP),atactic(aPP)andsyndiotactic(sPP)polypropylenes.Thesimulationofcoarse-grainedPPmodelswasperformedonahighcoordinationlatticeincorporatingshort-andlong-rangeintramolecularinteractionsfromtherotationalisomericstate(RIS)modelandLennard-Jones(LJ)potentialfunctionofpropanepairs,respectively.ThedynamicsofchainsinbinaryPP/PPmixturewereinvestigatedwiththecompositionofC150H302withdifferentchaintaciticity.ThediffusionratesofPPwithdifferentstereochemistryaregenerallyintheorderas:iPP>aPP>>sPP.ForPP/PPblendswith50:50wt%binarymixtures,immiscibilitywasobservedwhensPPwasintroducedintothemixtures.ThediffusionrateofiPPandaPPbecamesloweraftermixing,whilesPPdiffusessignificantlyfasterinthebinarymixtures.ThemobilityofPPchainsdependsonbothintramolecular(molecularsizeandchainstiffness)andintermolecular(chainpacking)interactions.TheeffectofintramolecularcontributionisgreaterthanthatofintermolecularcontributionforiPPandaPPchainsinbinarymixtures.ForsPPchain,intermolecularinteractionhasgreaterinfluenceonthedynamicsthanintramolecularcontribution.

简介：Nano-SiO2或哞3被介绍给橡胶(EVA/NBR)混合包含镁氢氧化物(MH)和红磷(RP)进一步改进机械性质的乙烯乙烯基acetate/nitrile丁二烯，油抵抗，吸抑制和火焰retardancy。结果显示张力的力量和油抵抗被合并nano-SiO显著地改进<潜水艇class=“a-plus-plus”>2。为EVA/NBR混合样品的烟抑制测试两个都显示出那nano-SiO<潜水艇class=“a-plus-plus”>2和哞<潜水艇class=“a-plus-plus”>3能显著地减少烟版本数量。易燃的描述显示有33.0的LOI价值的混合样品能在UL-94测试完成V-0水平。锥热量测定测试数据证明山峰热版本率是67%比那低为纯EVA/NBR。热分析证明两nano-SiO的存在<潜水艇class=“a-plus-plus”>2和哞<潜水艇class=“a-plus-plus”>3对支持EVA/NBR混合的字符形成有益。字符剩余分析建议了那哞<潜水艇class=“a-plus-plus”>在燃烧期间在稳固的阶段聚集的3。

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

简介：Inthiswork,DSCandSEMstudiesindicatethation-ligandinteractioncanbeutilizedtoenhancetheinteractionofpoly(styrene-block-2-vinylpyridine)[P(S-b-2VP)]andpolyethylenebasedionomer(Surlyn).Thecompatibilityforthisblendingsystemcanbeimprovedbythisspecialinteractionand20/80wtistheoptimumblendingcompositionwithgoodcompatibility.FTIRresultsfurthercertifythatstronginteractionsexistintheblendingsystem.

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：Thispaperdescribestheresultsofaninvestigationintotheeffectofthevariationofcuringtemperaturesbetween0and60°Conthehydrationprocess,porestructurevariation,andcompressivestrengthdevelopmentofactivatedcoalgangue-cementblend(ACGC).HardenedACGCpastescuredforhydrationperiodsfrom1to360dwereexaminedusingthenon-evaporablewatermethod,thermalanalysis,mercuryintrusionporosimetry,andmechanicaltesting.Toevaluatethespecificeffectofactivatedcoalgangue(ACG)asasupplementarycementingmaterial(SCM),aflyash-cementblend(FAC)wasusedasacontrol.ResultsshowthatraisingthecuringtemperatureacceleratespozzolanicreactionsinvolvingtheSCMs,increasingthedegreeofhydrationofthecementblends,andhenceincreasingtherateofimprovementinstrength.TheeffectofcuringtemperatureonFACisgreaterthanthatonACGC.Theporestructureofthehardenedcementpasteisimprovedbyincreasingthecuringtemperatureupto40°C,butwhenthecuringtemperaturereaches60°C,thechangingnatureoftheporestructureleadstoadecreaseinstrength.Thecorrelationbetweencompressivestrengthandthedegreeofhydrationandporosityislinearinnature.