Light scattering of dilute solutions of poly(methyl methacrylate) below the theta temperature

Yasuyuki Maki, Toshiaki Dobashi

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

Dilute solutions of poly(methyl methacrylate) (PMMA) in a mixed solvent (r-butyl alcohol (TBA), containing 2.5 vol% water) were studied by static and dynamic light scattering at temperatures below the Θ-temperature. The temperature-dependence of the second virial coefficient A 2 with a minimum and a maximum below the Θ-temperature was compared with curves calculated based on different theoretical models. The collapse process of PMMA chains due to the coil-globule transition was measured by static and dynamic light scattering; after the temperature jump below the Θtemperature, both the mean-square radius of gyration and the hydrodynamic radius of PMMA chains continued to decrease for several days, and the ratio ρ of the radius of gyration to the hydrodynamic radius decreased from 1.4 to 0.87, indicating a conformational change from a random coil to a globular state. In order to measure the chain expansion process from globule to coil by static light scattering, dilute solutions of PMMA were quenched below the Θ-temperature and preserved at the temperature for a time period Θ, followed by a temperature jump to Θ. The radius of gyration of PMMA was measured as a function of time after the temperature rise and its value reached unity in several hours. Furthermore, the chain expansion was shown to become slower with increasing t w.

本文言語英語
ページ(範囲)373-381
ページ数9
ジャーナルKobunshi Ronbunshu
69
7
DOI
出版ステータス出版済み - 7 2012
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
  • 環境科学(全般)
  • 材料科学(その他)
  • 化学工学(その他)

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