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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：ThisPaperreportsenrichmentandsepqrationoftracePd(Ⅱ）withsilicagelbondedby(benzolyazo-arsenazoI)-aminopropyl(BAAI·SG).BAAI·SGisstableinsolutionbetween6mol/LHClandpH9.0.ThemaximumadsorptivecapacitiesofBAAI·SGandSGare52.7,23.5μmol/grespectively.AfterpreconcentrationthroughBAII·SGcolumn,Pd(Ⅱ）ofppblevelinartificialwatersamplescanbemeasuredbyspectrophotometry.

简介：Theadsorptionoflowconcentrationoffreeacidbyregenerablechitinisfollowedbyelectricconductancedetermination.Theeffectofacidconcentratioin,contentoffunctioinalaminogroups,andionicstrengthonadsorptionwasdiscussed.Experimentalresultsindicatethattheactivecentreofregenerablechitinisthefreeaminogroupsonistsurface,andthattherateofadsorptionoffreeacidwasfoundtobeaffectedbytwofactors:theinteractionbetweentheadsorbentandtheadsorbateinsolutionandthatbetweentheadsorbatemoleculesorionsinsolution.

简介：ItwasgenerallyconsideredthatcontaminationofthegeltypepolystyrenestrongbasicanionexchangeresinbyorganicmatterinnaturalwateristheresultofionexchangeandVanderwaal′sadsorptiononit.Onthebasisoflaboratoryandindustrialexperiments,thispaperconfirmedthattheinterreactionbetweenorganicmatterandresinpolymermatrixisprimarilycontroledbyaVanderwaal′sadsorption.