High pressure differential scanning calorimetry of poly(4-methyl-pentene-1)

G. W.H. Höhne, S. Rastogi, B. Wunderlich

Research output: Chapter in Book/Report/Conference proceedingConference contribution

26 Scopus citations

Abstract

The polymer poly(4-methyl pentene-1), P4MP1, displays an unusual pressure-temperature phase diagram. The previous exploration of this phase behavior through X-ray diffraction has been extended through high-pressure calorimetry. The resulting phase diagram displays a melt area, the common tetragonal crystal phase, and a high-pressure phase of hexagonal symmetry. Below the glass transition temperature of the amorphous fraction, the tetragonal phase can be disordered by application of pressure in what seems to be a frustrated transition that leads to a conformationally disordered glass. The transitions between the phases, previously postulated on structural evidence, are supported by calorimetry. Observed are the following: (1) isothermal crystal disordering by increasing of pressure; (2) isobaric crystal perfection on heating, and disordering on cooling; (3) sign inversion of the pressure coefficient of the melting temperature. Equilibrium and nonequilibrium features of the phase diagram are discussed.
Original languageEnglish (US)
Title of host publicationPolymer
PublisherElsevier Science LtdExeter
Pages8869-8878
Number of pages10
DOIs
StatePublished - Sep 8 2000
Externally publishedYes

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