Thermodynamics of solutions of polypropylene2

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1、ViewOnline/JournalHomepage/TableofContentsforthisissueThermodynamicsofSolutionsofPolypropyleneOxideinChloroformandinCarbonTetrachlorideBYR.W.KERSHAW"ANDG.N.MALCOLMChemistryDept.,UniversityofOtago,Dunedin,NewZealandReceived28thMarch,1967Measurementsarereportedofthevapourpre

2、ssures,theheatsandvolumesofmixing,andthethermalpressurecoefficientsofsolutionsofpolypropyleneglycoldimethyletherinchloroformandincarbontetrachloride.Forthecalorimetry,anewandextremelysimpletypeofmixingvesselforanisothermalcalorimeterwasdesignedwhichenabledtwoliquidcomponen

3、tstobemixedatconstantpressurewithoutthepresenceofanyvapourspaceabovetheliquids.Themeasurementshavebeenusedtocalculatethethermodynamicmixingfunctionsformixingwithzerovolumechange,whicharecomparedwiththepredictionsofthegeneralizedlatticetheory.Thethermodynamicbehaviouroftheh

4、ydrogen-bondingchloroformsolutionsispredictedmorecloselybytheuseofthe"zerothapproximation"inthelatticetheorythanbytheuseofthe"first"or"quasi-chemical"approximation.ThebehaviourofthecarbontetrachloridesolutionsispredictedwithinexperimentalerrorbythesimpleFloryequations.This

5、paperreportsthefirstpartofasystematicstudyofthepropertiesofpolymersolutionsinwhichhydrogenbondsareformedbetweenthepolymerandthesolventmolecules.Theoreticaltreatmentsofmixturesofpolarsubstanceshavebeendevelopedtoastagewhereitisprofitabletotestthemwithdataofthehighestprecisi

6、on.Inthefieldofpolarpolymersolutionsrecentstudieswhichmighthavebeenusedforthispurposehaveprovedintractablebecausemanydifferentkindsofstrongmolecularinteractionshavebeenpresent.'Wechosetocommenceourworkwithcommerciallyavailablepolyethyleneandpolypropyleneglycols,andtoDownlo

7、adedbyChengduInstituteofBiology,CASon03March2012Publishedon01January1968onhttp://pubs.rsc.org

8、doi:10.1039/TF9686400323limitthenumberofstronginteractionsinthesolutionsbymethyfationoftheterminalhydroxylgroups.Wechosechloroformratherthanahydroxycompoundlasthesolventbecauseitw

9、ouldformstronghydrogenbondsonlywiththepolyetherandnotwithitself.Toobtaininformationaboutt