简介：X-rayphotoelectronspectroscopyandRamanspectroscopywereusedtodeterminethechemicalchangeofpolyphenylsilsesquioxane(PPSQ)duringpyrolysisinflowingnitrogen.TwotemperaturerangeswerefoundforpyrolysedPPSQbelowandabove600℃,respectively.TheformerisrelatedtotherearrangementofPPSQbackboneandthelatterreflectsthatmostofbackbonestructureofPPSQmightbebrokendownandunorganized.CarbonformedincarbonizationofPPSQsamplepyrolysedat900℃shouldbesp3bondedcarbonwithcrystallitesizeeffectsordefects.

简介：Thephotophysicalpropertiesofaseriesofsulfonatedmicromolecule(paratoluenesulfonicacid,HPTS)andmacromolecules(linearandcrosslinkedpolystyrene)havebeenstudiedbysteady-statefluorescencespectra.Theresultsindicatethatthegroundsulfonatedringassociationscanforminboththemicromoleculesandthemacromolecules.Thefluorescencespectraofthesulfonatedcrosslinkedcopolymersappearared-shiftwhenthecopolymerschangefromhydrogen-typetosodium-type,andsomenewemissionbandsappearinthelong-wavelengthregion.Theseresultsareexplainedintermsofsynergeticeffectofhydrogenbond,π-πinteractionandcrosslinkingeffect.

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简介：Withcelluloseascarrier,immobilizedthermolysinHEIandHEⅡwerepreparedbydiazocouplingorglutaraldehydecrosslinkingreaction.Usingcaseinasasubstrate,theactivityrecoveryofimmobilizedthermolysinHEIandHEⅡreach34.5%and29%,respectively.Somefactorswhichaffecttheactivityoftheimmobilizedthermolysinsuchastemperature,mediumpH,EDTAandcalciumacetatewerestudied.Atthesametime,thethermalstabilityandstoragestabilityoftheimmobilizedthermolysinwerealsoinvestigated.

简介：Stroma-freehemoglobin(SFHb)waspreparedfromfreshorout-datedwholebloodbylysingredcells.Atdifferenttemperatures,pyridoxal5-phosphate(PLP)wasaddedina4:1molar-ratiototheHbtetramerfollowedbyreductionwithNaBH4underN2for16hrssubsequentcrosslinkingbyglutaraldehydeinpresenceoflysinefor14-16hrs.Yieldedsolublepyridoxalatedpolyhemoglobin(PolyHb-P).5%-20%gradientSDS-PAGEshowedthechangeoftheHbmolecularweight(MW)aftercrosslinking.GelchromatographyshowedthatthepolyHb-Phadacontinuousdistributionofmolecularweightwiththerangefromabout65,000to600,000Dalton.ThepolyHb-Psolutionprovidedanornaloxygencarryingwith23.1ofP50atpH7.24or26.1ofP50atpH7.24.

简介：Severalkindsofnovelazobenzene-containingpolyelectrolyteswithspecialmoleculardesignhavebeendevelopedfromacryloylchlorideorepoxybasedprecursorpolymers.Theacryloylchloridebasedprecursorpolymer,poly(acryloylchloride),waspreparedbyfreeradicalpolymerizationofacryloylchloride.Theazopolyelectrolyteswerepreparedbyanesterificationreactionbetweentheprecursorpolymerandcorrespondingazochromophorescontainingareactivehydroxylgroup,followedbyhydrolysisoftheunreactedacylchloridegroups.Theepoxybasedprecursorpolymerwaspreparedbythereactionbetween1,4-cyclohexanedimethanoldiglycidyletherandaniline,andpostfunctionalizedbyazocouplingreactiontoformazopolymerscontainingchromophoreswithionizablegroups.Thepolyelectrolyteswerecharacterizedbyelementalanalysis,~1H-NMR,IRandUV-Visspectroscopy.Thephotodynamicandphotoresponsiveproperties,aswellasself-assemblyoftheseazopolyelectrolytesarereportedinthispaperp.

简介：Inthispaper,thecontinuouselectroregenerationofionexchangeresinisinvestegated.Themixedresinisinsertedbetweenacationexchangemembraneandananionexchangemembrane.Theeffluentwateroffreshwaterroommeetsthedemandforpowerplantonwatertreatment.TheB2thatisthecumulativeformationconstantofthemetalcomplexesofresinisverydifferentewithorwithoutelectricfield.Itindicatesthatthedissociationdegreeofmetalcomplexesofresinisgreaterwitelectricfieldthanthatwithoutelectricfield.

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简介：Theheatofhydrationofdrysulfonicacidresinindifferentcomcentrationsofsulfuricacidhasbeendetermined.TheheatofhydrationoftheresininH2Ois143.4J/g(resin).Thegreatertheconcentrationofsulfuricacid,thelesstheheatwillbereleased.Thehydrateformedfromthreesulfonicacidgroupsandonewatermoleculeisthemoststableoneofallthehydratesofsulfonicacidresinandwater.

简介：Thefeasibilityofrecoveringglutamicacidbyionexchangemethodwithmacroporousresinswasinvestigated.Theiradsorptionpropertiesinstatistateandtheeffectivefactors,suchaspH,concentrationofeeedandtheratioofammoniumiontoglutamicacid,weresystematicallyexplored.Thebestconditionofseparatingglutamicacidfrommotherliquidwereobtained.

简介：TheinteractionsbetweenmetalionssuchasZn2+,Pb2+,Mn2+,Hg2+,Cd2+,Ni2+andchitosanhavebeeninvestigatedusingthemodelclustermodelmethodanddensityfunctionalmethod.FulloptimizationandfrequencyanalysisofallclustermodelshavebeenperformedemployingB3LYPhybridmethodat3-21Gbasissetlevelexceptmetalionswhichwereinvokedtouseeffectivecorepotential(ECP)method.Theenergychanges,andthemainstructuralparametershavebeenobtainedduringthetheoreticalstudyoftheadsorptionofmetalionsonthechitosan.Thecalculationsshowedthatthecoordinationmodesofmetalionswithchitosanmodelsweredifferent,thegeometriesofMn2+,Zn2+,Cd2+,Hg2+,Pb2+ionscoordinatedwithtwonitrogenatomsandtwooxygenatomsweredistortedtetrahedral,whilethesquareplanarstructureofNi2+coordinatedtwonitrogenatomsandtwooxygenatomswasobserved.Theheatofreactionbetweensixmetalionsandchitosanmodelsshowedtheorder:Mn2+＞Ni2+＞Zn2+＞Pb2+＞Hg2+＞Cd2+,thissuggestedthatthecoordinationstrengthofMn2+＞Ni2+＞Zn2+＞Pb2+＞Hg2+＞Cd2+.

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简介：Thephotopolymerizationoftwokindsofprepolyesterscontainingconjugateddiacetylene(PDA-6andPDA-12)wasinvestigatedusingDSC.BymeasuringtheendothermicenthalpyoftheprepolymersafterdifferentUV-irradiationtimes,thepolymerizationswerefoundtofollowthefirst-orderratelawwhichagreedwiththeresultsofotherinvestigatorsusingadifferentmethod.TheendothermicenthalpymeasurementsofPDA-6andPDA-12beforeUV-irradiationprecludedthepossibilitythatthedecreaseofendothermicenthalpywascausedbythermalpolymerization.

简介：TheenzymatichydrolysisofmacromoleculargelatinwithAS1.398neutralprotease,bromelainandtheircombinationswasstudiedbyestimatingthemolecularweightsoftheirhydrolyticproducts.Itwasdiscoveredthattheproductshydrolyzedbyusingcombinationenzymeshadlowermolecularweightthanthoseobtainedbyusingsingleones,andthekindofenzymes,theircombinationmodeandadditionsequenceareeffectivewaystocontrolthemolecularweightsofgelatinhydrolyzates.

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