Free-radical copolymerization VII. reinterpretation of velocity-of-copolymerization data

Takeshi Fukuda, Yung Dae Ma, Keiji Kubo, Akihiko Takada

研究成果: Contribution to journalArticle査読

42 被引用数 (Scopus)

抄録

Velocity-of-copolymerization data available in the literature were reinterpreted on the basis of the current notions that the penultimate-unit effect with respect to absolute values of propagation rate constant (but not with respect to the monomer reactivity ratios) is a general rule, and that the termination step is diffusion-controlled, i.e., normal. By making a few simplifying approximations, a new velocity equation was derived, which was found to describe experimental data generally better than the classical equation based on the terminal propagation model with a single adjustable parameter φ, the cross-termination factor. The single adjustable parameter s included in the new equation, which measures the penultimate-unit effect, was found to have a strong correlation with the monomer reactivity ratios such that the smaller r1r2, the smaller is s, i.e., the more significant is the penulimate-unit effect. This result is in support of the relation r1r2=s1s2 suggested by the phenomenological theory [T. Fukuda et al., Makromol. Chem., Rapid Commun., 8, 495 (1987)].

本文言語英語
ページ(範囲)1003-1009
ページ数7
ジャーナルPolymer Journal
21
12
DOI
出版ステータス出版済み - 12 1989
外部発表はい

All Science Journal Classification (ASJC) codes

  • ポリマーおよびプラスチック
  • 材料化学

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