{"title":"Thermodynamic Properties of Polyethylene Predicted from Paraffin Data.","authors":"Martin G Broadhurst","doi":"10.6028/jres.067A.023","DOIUrl":null,"url":null,"abstract":"<p><p>Thermodynamic data on the <i>n</i>-paraffins from <i>n</i>-C<sub>6</sub>H<sub>14</sub> through <i>n</i>-C<sub>18</sub>H<sub>38</sub> have been used to obtain values for the specific heat, entropy, enthalpy, and Gibbs free energy of a large, ideal CH<sub>2</sub>-chain crystal from 0 to 420 °K and of the liquid above 200 °K. Analytical expressions are given for the properties of the crystal and liquid above 200 °K. For the crystal, a modified Einstein function was used to adjust the melting temperature to 414.3 °K. Values between 975 and 1025 cal/mole for the heat of fusion were found to be the ones most consistent with the data. Comparison of the results with polyethylene data shows reasonable agreement.</p>","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":"67A 1","pages":"233-240"},"PeriodicalIF":0.0000,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319452/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.6028/jres.067A.023","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"1963/6/1 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Thermodynamic data on the n-paraffins from n-C6H14 through n-C18H38 have been used to obtain values for the specific heat, entropy, enthalpy, and Gibbs free energy of a large, ideal CH2-chain crystal from 0 to 420 °K and of the liquid above 200 °K. Analytical expressions are given for the properties of the crystal and liquid above 200 °K. For the crystal, a modified Einstein function was used to adjust the melting temperature to 414.3 °K. Values between 975 and 1025 cal/mole for the heat of fusion were found to be the ones most consistent with the data. Comparison of the results with polyethylene data shows reasonable agreement.
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