Supercritical CO2-induced stereocomplex formation of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends: Effect of molecular weight on crystalline structure

Tomohiro Mizumoto; Norio Sugimura; Masahiko Moritani; Hajime Yasuda; Yoshiyuki Sato; Hirokatsu Masuoka

doi:10.1021/ma002213e

Supercritical CO₂-induced stereocomplex formation of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends: Effect of molecular weight on crystalline structure

Tomohiro Mizumoto, Norio Sugimura, Masahiko Moritani, Hajime Yasuda, Yoshiyuki Sato, Hirokatsu Masuoka

ENG - Research Center of Supercritical Fluid Terchnolody

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

Crystalline stereocomplexes of highly stereoregular isotactic poly(methyl methacrylate) (it-PMMA) and syndiotacitc poly(methyl methacrylate) (st-PMMA) blends formed by treatment with supercritical CO₂ were investigated by means of differential scanning calorimetry (DSC) measurements as a function of PMMA molecular weight. The rates of stereocomplex formation obtained with supercritical CO₂ treatment were faster than those obtained by thermal treatment. The higher rates of stereocomplex formation can be attributed to the plasticizing effect of CO₂ molecules in the PMMA. The heat of melting of the stereocomplex (ΔH) decreased with increasing PMMA molecular weight and was found to be independent of it-PMMA and st-PMMA mixing ratio. For the case of it-PMMA/st-PMMA of 1:1, the stereocomplexes obtained by thermal and CO₂ treatment had two endothermic peaks. The relative intensity of the second endothermic peak (ΔH₃/ΔH) decreased with increasing PMMA molecular weight and showed stronger dependence on it-PMMA molecular weight than on the st-PMMA molecular weight.

Original language	English
Pages (from-to)	5200-5204
Number of pages	5
Journal	Macromolecules
Volume	34
Issue number	15
DOIs	https://doi.org/10.1021/ma002213e
Publication status	Published - 2001 Jul 17

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma002213e

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Supercritical CO₂-induced stereocomplex formation of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends : Effect of molecular weight on crystalline structure. / Mizumoto, Tomohiro; Sugimura, Norio; Moritani, Masahiko; Yasuda, Hajime; Sato, Yoshiyuki; Masuoka, Hirokatsu.

In: Macromolecules, Vol. 34, No. 15, 17.07.2001, p. 5200-5204.

Research output: Contribution to journal › Article

Mizumoto, T, Sugimura, N, Moritani, M, Yasuda, H, Sato, Y & Masuoka, H 2001, 'Supercritical CO₂-induced stereocomplex formation of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends: Effect of molecular weight on crystalline structure', Macromolecules, vol. 34, no. 15, pp. 5200-5204. https://doi.org/10.1021/ma002213e

Mizumoto, Tomohiro ; Sugimura, Norio ; Moritani, Masahiko ; Yasuda, Hajime ; Sato, Yoshiyuki ; Masuoka, Hirokatsu. / Supercritical CO₂-induced stereocomplex formation of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends : Effect of molecular weight on crystalline structure. In: Macromolecules. 2001 ; Vol. 34, No. 15. pp. 5200-5204.

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abstract = "Crystalline stereocomplexes of highly stereoregular isotactic poly(methyl methacrylate) (it-PMMA) and syndiotacitc poly(methyl methacrylate) (st-PMMA) blends formed by treatment with supercritical CO2 were investigated by means of differential scanning calorimetry (DSC) measurements as a function of PMMA molecular weight. The rates of stereocomplex formation obtained with supercritical CO2 treatment were faster than those obtained by thermal treatment. The higher rates of stereocomplex formation can be attributed to the plasticizing effect of CO2 molecules in the PMMA. The heat of melting of the stereocomplex (ΔH) decreased with increasing PMMA molecular weight and was found to be independent of it-PMMA and st-PMMA mixing ratio. For the case of it-PMMA/st-PMMA of 1:1, the stereocomplexes obtained by thermal and CO2 treatment had two endothermic peaks. The relative intensity of the second endothermic peak (ΔH3/ΔH) decreased with increasing PMMA molecular weight and showed stronger dependence on it-PMMA molecular weight than on the st-PMMA molecular weight.",

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