Crystallization of Copolymers of 3-Methyl-1-butene with Olefins Produced by Ziegler-Natta Catalysts

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概要

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• Copolymerizations of 3-methyl-1-butene with olefins such as butene-1, pentene-1, decene-1 and 4-methyl-1-pentene were carried out by using Ziegler-Natta catalytic systems.<BR>In oder to study the so-called isomorphism or cocrystallization phenomena between different comonomer units in the crystalline structures of the olefin copolymers crystallized from melt, the molecular and fine structures of the crystalline copolymers were investigated by the experimental information and discussion in relation to, 1) the chain conformations in crystalline structures of each olefin homopolymer, 2) dependence of the size of crystal lattice and physicochemical properties such as crystallinity and melting point on the composition in the copolymer, 3) statistical analysis of the distribution of the sequence length of each comonomer unit in the copolymeric chains from the data of monomer reactivity ratios and 4) the constitution of the copolymeric chains in the amorphous phase by the measurement of viscoelastic properties.<BR>All the copolymers cited here more or less indicated an evidence of the isomorphism or cocrystallization phenomena, in particular the copolymers with pentene-1 and 4-methyl-1-pentene showed strong tendency of it owing to the similarities of the molecular structure and the crystalline structure of each homopolymer, though in the copolymeric systems expect the copolymer with 4-methyl-1-pentene each comonomer unit was not always distributed at random but rather in blockwise. Furthermore, it was found that comonomer units of large size such as decene-1 having a steric hindrance due to the long side chain could not be incorporated into the crystal lattice as a crystallizable unit but only as a non crystallizable defect.

• 公益社団法人 高分子学会の論文

公益社団法人 高分子学会 | 論文

• 情報の入口--高分子センサ-とトランスデュ-サ- (情報化社会と高分子)
• 高分子科学最近の進歩--メルトレオロジ-(伸長粘度)
• 高分子系の相分離--特にポリマ-ブレンドについて
• 導電性高分子の磁気緩和--NMRT-1〓1の周波数依存性
• 多機能性高分子の合成 (化学修飾による多機能性高分子)

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