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页数:14页
时间:2019-07-16
《Thermodynamics of solutions of polypropylene2 》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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