Effect of fusion conditions of β-polypropylene on the new crystallization

J. Varga, F. Schulek-Tóth, A. Ille

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The new crystallization of β-modification of polypropylene (β-PP) was studied after melring as a function of the final temperature of fusion (TF). The new crystallization, thermal characteristics, polymorphic composition, and structure of recrystallized samples were highly influenced by the TF level. As a function of TF, three characteristic regions were outlined: Region I below the melting point of β-modification, region II between the melting points of β- and α-modifications, and region III above the melting point of α-modification. In the vicinity of the melting points of both modifications, two narrow transition regions are observed where the crystallization and structural characteristics changed abruptly with TF. At TF values in region I, recrystallization of β-modification proceeded without any change in the modification. If TF fell in region II, the sample crystallized newly into α-modification. The optically negative β-ring-spherulites were replaced by positive microclusters of α-modification and a marked structural memory effect was observed. In region III, the above characteristic became invariant with TF (region of blank melt). These observations may be interpreted by the role of self nuclei.

Original languageEnglish
Pages (from-to)655-664
Number of pages10
JournalColloid & Polymer Science
Volume269
Issue number7
DOIs
Publication statusPublished - Jul 1 1991

Keywords

  • New crystallization
  • self nuclei
  • spherulites
  • structural memory effect
  • trans crystallization
  • β-modification of poly-propylene
  • β→α-modification transition

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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