Relationships between Polymer Structure and Glass Temperature. I. Thenhyphen;Alkanes

摘要

The constants in the empirical equationloglpar;eegr;sol;drpar;equals;logAplus;Bsol;lpar;Tminus;T0rpar;were evaluated from published viscosities eegr; and densitiesdfor 23nhyphen;alkanes. All three adjustable parametersA, B,andT0were found to vary with chain length. The parameterT0is predicted with good precision by the Gibbsmdash;DiMarzio theory of the glass transition with a ``flex energy'' egr; of 490.8 cal/mole. This value is in agreement with determinations by other methods.