简介：调制温度的微分扫描calorimetric和动态机械分析和绝缘的光谱学被用来与潮湿吸收调查含水的小麦麦胶蛋白质粉末的玻璃转变从2.30db%到18.21db%。干燥小麦麦胶蛋白质的玻璃转变温度(Tg)根据Gordon-Taylor方程被估计。在水和的高度的结构的异质在绝缘的温度和频率系列被揭示。激活精力(E一)二松驰从Arrhenius被计算方程。

简介：Inthispaper,anartificialneuralnetworkmodelisadoptedtostudytheglasstransitiontemperatureofpolymers.Inourartificialneuralnetworks,theinputnodesarethecharacteristicratioC∞,theaveragemolecularweightM,betweenentanglementpointsandthemolecularweightMmonofrepeatingunit.TheoutputnodeistheglasstransitiontemperatureTg,andthenumberofthehiddenlayeris6.Wefoundthattheartificialneuralnetworksimulationsareaccurateinpredictingtheoutcomeforpolymersforwhichitisnottrained.Themaximumrelativeerrorforpredictingoftheglasstransitiontemperatureis3.47%,andtheoverallaverageerrorisonly2.27%.Artificialneuralnetworksmayprovidesomenewideastoinvestigateotherpropertiesofthepolymers.

简介：由控制厘米/苯乙烯和聚合时间的feed比率，一系列hyperbranchedcopolystyrenes(HBCPS)与可比较的平均重量的分子的重量被综合(Mw)但是通过原子转移基的分叉的不同的度(DB)有CuBr/2,2-bipyridyl的自我压缩的乙烯基copolymerization(ATR-SCVCP)作为催化剂。产生HBCPS样品被用来在他们的玻璃转变行为上调查分叉的建筑学的效果。与增加的DB，玻璃转变温度(T直接存储器存取和DSC测量的HBCPS样品的g)两个都减少了。他们的纺纱格子松驰时间(1质子的HT1r)与增加DB显示了一样的落之趋势。而且，在Tgs和DB被所有原子很好建立分子的动力学(MD)模拟。MD坚定的Tgs比相应的试验性的很少高。然而，TgDB上的s在对试验性的结果的好同意，即，Tg与增加DB在实验和模拟两个都减少。

简介：用ellipsometry，它被发现纺纱涂的polyacrylamide(PAL)的玻璃转变温度支持的硅(Si)上的薄电影有氧化物层的底层有减少的减少电影厚度。但是T<潜水艇class=“a-plus-plus”>g同样准备的薄电影的s比体积样品的高得多。如此的观察能被归因于在PAL之间的效果和增加的氢结合相互作用由于旋转coating/thin电影监禁锁住的表面的联合结果。

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：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.