Crystalline structure and thermal property of polyethylene and isotactic polypropylene containing cyclopentane units in the main chain

Naofumi Naga, Michiyo Tsubooka, Shoji Suehiro, Yukio Imanishi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Polyethylene and isotactic polypropylene having 1,2- or 1,3-disubstituted cyclopentane structures were prepared by copolymerization of ethylene or propylene with cyclopentene (CPE) or 1,5-hexadiene (HD) using zirconocene catalysts. Effect of the cyclopentane structures on the melting point and crystalline structure of the copolymers was investigated. In the case of ethylene-based copolymers, polyethylene containing 1,3-disubstituted cyclopentane structure, poly(ethylene-co-HD), showed a lower degree of melting-point depression and decreasing crystallinity with increasing cyclopentane contents than polyethylene containing 1,2-disubstituted cyclopentane structure, poly(ethylene-co-CPE). Expansion of crystalline unit cell, especially along the a-axis, with increasing cyclopentane content was observed in the wide-angle X-ray diffraction patterns of the poly(ethylene-co-HD). The phenomenon indicated incorporation of 1,3-disubstituted cyclopentane structure in the crystalline phase of polyethylene. On the other hand, both poly(propylene-co-CPE) and poly(propylene-co-HD) showed similar profiles in the relationship between the comonomer content and the melting point or the crystallinity of the copolymers.

Original languageEnglish
Pages (from-to)3041-3047
Number of pages7
JournalMacromolecules
Volume35
Issue number8
DOIs
Publication statusPublished - 2002 Apr 9
Externally publishedYes

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Cyclopentanes
Polypropylenes
Polyethylene
Polyethylenes
Ethylene
Thermodynamic properties
Crystalline materials
Melting point
Copolymers
Copolymerization
Diffraction patterns
Propylene
X ray diffraction
Catalysts
ethylene

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Crystalline structure and thermal property of polyethylene and isotactic polypropylene containing cyclopentane units in the main chain. / Naga, Naofumi; Tsubooka, Michiyo; Suehiro, Shoji; Imanishi, Yukio.

In: Macromolecules, Vol. 35, No. 8, 09.04.2002, p. 3041-3047.

Research output: Contribution to journalArticle

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