抄録
Copolymerization of ethylene and 1,5-hexadiene (HD) by zirconocene catalysts proceeded via cyclization-addition mechanism to form 1,3-didsubstituted cyclopentane structure in the polyethylene chain. The 1,3-cyclopentane structure was found to be taken in the crystalline structure of polyethylene (isomorphism) by partially chainging the trans zigzag chain into gauche conformation, thereby, inducing a transformation of orthorhombic crystal to pseudohexagonal crystal. Copolymerization of ethylene and cyclopentene (CPE) by zirconocene catalysts yielded copolymers having 1,2-disubstituted cyclopentane structure in the polyethylene chain. The 1,2-cyclopentane structure was not taken into the crystalline structure of polyethylene. The melting point (Tm) and the crystallinity (Xc) of polyethylene decreased by copolymerization of HD or CPE, and the Tm- and Xc-decreasing effect of CPE was stronger than HD. For copolymers of propylene and HD or CPE obtained with isospecific zirconocene catalyst, the isomorphism was not ovserved.
| 元の言語 | English |
|---|---|
| ページ（範囲） | 45-62 |
| ページ数 | 18 |
| ジャーナル | Macromolecular Symposia |
| 巻 | 195 |
| DOI | |
| 出版物ステータス | Published - 2003 6 |
| 外部発表 | Yes |
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ASJC Scopus subject areas
- Polymers and Plastics
- Materials Chemistry
これを引用
Synthesis of polyolefins with unique properties by using metallocene-type catalysts. / Imanishi, Yukio; Naga, Naofumi; Tsubooka, Michiyo.
：: Macromolecular Symposia, 巻 195, 06.2003, p. 45-62.研究成果: Article
}
TY - JOUR
T1 - Synthesis of polyolefins with unique properties by using metallocene-type catalysts
AU - Imanishi, Yukio
AU - Naga, Naofumi
AU - Tsubooka, Michiyo
PY - 2003/6
Y1 - 2003/6
N2 - Copolymerization of ethylene and 1,5-hexadiene (HD) by zirconocene catalysts proceeded via cyclization-addition mechanism to form 1,3-didsubstituted cyclopentane structure in the polyethylene chain. The 1,3-cyclopentane structure was found to be taken in the crystalline structure of polyethylene (isomorphism) by partially chainging the trans zigzag chain into gauche conformation, thereby, inducing a transformation of orthorhombic crystal to pseudohexagonal crystal. Copolymerization of ethylene and cyclopentene (CPE) by zirconocene catalysts yielded copolymers having 1,2-disubstituted cyclopentane structure in the polyethylene chain. The 1,2-cyclopentane structure was not taken into the crystalline structure of polyethylene. The melting point (Tm) and the crystallinity (Xc) of polyethylene decreased by copolymerization of HD or CPE, and the Tm- and Xc-decreasing effect of CPE was stronger than HD. For copolymers of propylene and HD or CPE obtained with isospecific zirconocene catalyst, the isomorphism was not ovserved.
AB - Copolymerization of ethylene and 1,5-hexadiene (HD) by zirconocene catalysts proceeded via cyclization-addition mechanism to form 1,3-didsubstituted cyclopentane structure in the polyethylene chain. The 1,3-cyclopentane structure was found to be taken in the crystalline structure of polyethylene (isomorphism) by partially chainging the trans zigzag chain into gauche conformation, thereby, inducing a transformation of orthorhombic crystal to pseudohexagonal crystal. Copolymerization of ethylene and cyclopentene (CPE) by zirconocene catalysts yielded copolymers having 1,2-disubstituted cyclopentane structure in the polyethylene chain. The 1,2-cyclopentane structure was not taken into the crystalline structure of polyethylene. The melting point (Tm) and the crystallinity (Xc) of polyethylene decreased by copolymerization of HD or CPE, and the Tm- and Xc-decreasing effect of CPE was stronger than HD. For copolymers of propylene and HD or CPE obtained with isospecific zirconocene catalyst, the isomorphism was not ovserved.
KW - 1,5-hexadiene
KW - Copolymerization
KW - Ethylene
KW - Isomorphism
KW - Zirconocene catalyst
UR - http://www.scopus.com/inward/record.url?scp=0042869688&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042869688&partnerID=8YFLogxK
U2 - 10.1002/masy.200390144
DO - 10.1002/masy.200390144
M3 - Article
AN - SCOPUS:0042869688
VL - 195
SP - 45
EP - 62
JO - Macromolecular Symposia
JF - Macromolecular Symposia
SN - 1022-1360
ER -