Melting memory effect of the β-modification of polypropylene

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Abstract

The pure β-modification of polypropylene has been prepared. It has been found that the nature of the melting of the β-modification strongly depends on the thermal history of the sample (melting memory effect). The melting of samples cooled to room temperature after crystallization is a complex process consisting of three partially overlapping processes (β-melting → recrystallization in the α-modification (βα-recrystallization)→α-melting). If heating starts at the temperature of crystallization, the β-modification melts separately, without βα-recrystallization. Under melting conditions free from the interference caused by βα-recrystallization, the β-modification exhibits the melting characteristics of thermodynamically stable modifications. The thermodynamic equilibrium melting point of the β-modification has been determined to be Tm0(β)=456 K.

Original languageEnglish
Pages (from-to)165-172
Number of pages8
JournalJournal of Thermal Analysis
Volume31
Issue number1
DOIs
Publication statusPublished - Jan 1986

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Polypropylenes
polypropylene
Melting
melting
Data storage equipment
Crystallization
crystallization
thermodynamic equilibrium
melting points
Melting point
histories
Thermodynamics
interference
Heating
Temperature
heating
room temperature

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Engineering(all)

Cite this

Melting memory effect of the β-modification of polypropylene. / Varga, J.

In: Journal of Thermal Analysis, Vol. 31, No. 1, 01.1986, p. 165-172.

Research output: Contribution to journalArticle

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