Crystalline structure of polyethylene containing 1,2- or 1,3-disubstituted cyclopentane units in the main chain

Naofumi Naga, Michiyo Tsubooka, Masato Sone, Kohji Tashiro, Yukio Imanishi

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Polyethylene having 1,2- or 1,3-disubstituted cyclopentane structures was prepared by copolymerization of ethylene and cyclopentene (CPE) or 1,5-hexadiene (HD), and the crystalline structure was studied. Treatment with fuming nitric acid preferentially degraded the amorphous phase of the copolymers, and the structure of degraded samples indicated that 1,3-disubstituted cyclopentane units were taken in the crystalline phase of poly(ethylene-co-HD). Infrared spectra of the copolymers indicated the increase of hexagonal-phase character in poly(ethylene-co-HD) with increasing content of 1,3-disubstituted cyclopentane units. Wide-angle X-ray diffraction patterns of poly(ethylene-co-HD) showed a continuous transition from the orthorhombic phase to the hexagonal phase in the copolymer with HD content less than 15 mol %. On the other hand, 1,2-disubstituted cyclopentane structures were not taken in the crystalline phase, but in the amorphous phase.

Original languageEnglish
Pages (from-to)9999-10003
Number of pages5
JournalMacromolecules
Volume35
Issue number27
DOIs
Publication statusPublished - 2002 Dec 31
Externally publishedYes

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Cyclopentanes
Polyethylene
Polyethylenes
Ethylene
Crystalline materials
Copolymers
Nitric acid
Nitric Acid
Copolymerization
Diffraction patterns
Infrared radiation
X ray diffraction
1,5-hexadiene
ethylene

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Crystalline structure of polyethylene containing 1,2- or 1,3-disubstituted cyclopentane units in the main chain. / Naga, Naofumi; Tsubooka, Michiyo; Sone, Masato; Tashiro, Kohji; Imanishi, Yukio.

In: Macromolecules, Vol. 35, No. 27, 31.12.2002, p. 9999-10003.

Research output: Contribution to journalArticle

Naga, Naofumi ; Tsubooka, Michiyo ; Sone, Masato ; Tashiro, Kohji ; Imanishi, Yukio. / Crystalline structure of polyethylene containing 1,2- or 1,3-disubstituted cyclopentane units in the main chain. In: Macromolecules. 2002 ; Vol. 35, No. 27. pp. 9999-10003.
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AU - Naga, Naofumi

AU - Tsubooka, Michiyo

AU - Sone, Masato

AU - Tashiro, Kohji

AU - Imanishi, Yukio

PY - 2002/12/31

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N2 - Polyethylene having 1,2- or 1,3-disubstituted cyclopentane structures was prepared by copolymerization of ethylene and cyclopentene (CPE) or 1,5-hexadiene (HD), and the crystalline structure was studied. Treatment with fuming nitric acid preferentially degraded the amorphous phase of the copolymers, and the structure of degraded samples indicated that 1,3-disubstituted cyclopentane units were taken in the crystalline phase of poly(ethylene-co-HD). Infrared spectra of the copolymers indicated the increase of hexagonal-phase character in poly(ethylene-co-HD) with increasing content of 1,3-disubstituted cyclopentane units. Wide-angle X-ray diffraction patterns of poly(ethylene-co-HD) showed a continuous transition from the orthorhombic phase to the hexagonal phase in the copolymer with HD content less than 15 mol %. On the other hand, 1,2-disubstituted cyclopentane structures were not taken in the crystalline phase, but in the amorphous phase.

AB - Polyethylene having 1,2- or 1,3-disubstituted cyclopentane structures was prepared by copolymerization of ethylene and cyclopentene (CPE) or 1,5-hexadiene (HD), and the crystalline structure was studied. Treatment with fuming nitric acid preferentially degraded the amorphous phase of the copolymers, and the structure of degraded samples indicated that 1,3-disubstituted cyclopentane units were taken in the crystalline phase of poly(ethylene-co-HD). Infrared spectra of the copolymers indicated the increase of hexagonal-phase character in poly(ethylene-co-HD) with increasing content of 1,3-disubstituted cyclopentane units. Wide-angle X-ray diffraction patterns of poly(ethylene-co-HD) showed a continuous transition from the orthorhombic phase to the hexagonal phase in the copolymer with HD content less than 15 mol %. On the other hand, 1,2-disubstituted cyclopentane structures were not taken in the crystalline phase, but in the amorphous phase.

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