Abstract
The heat capacity of poly-4-methyl-pentene-1 (P4MP) has been measured from about 77° to 540°K, as a function of the thermal history imparted to the sample. In addition to the glass and the melting transitions (∼ 305° and 522°K, respectively), an intermediate transition was found at about 445°, and there is some evidence that this is related to the fusion (or solid-solid transformation) of a polymorph of P4MP. The calculated configurational entropy was shown to be unusually low at T g, and a simple explanation for this, based on differences in the properties of atactic and stereoregular P4MP, is proposed. This could account also for the reported anomaly in the configurational volume.
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