CO2-induced stereocomplex formation of stereoregular poly(methyl methacrylate) and microcellular foams

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

doi:10.1021/ma000443n

CO₂-induced stereocomplex formation of stereoregular poly(methyl methacrylate) and microcellular foams

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

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

Crystalline stereocomplex formation of isotactic poly(methyl methacrylate) (it-PMMA) and syndiotactic poly(methyl methacrylate) (st-PMMA) induced by high-pressure CO₂ at pressures in the 5-35 MPa range and at temperatures in the 30-110 °C range was demonstrated by means of differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) investigations as a function of treatment pressure, temperature, and the it-PMMA/st-PMMA ratio. At a constant it-PMMA/st-PMMA ratio, the melting temperature of the stereocomplexes was shown to increase with increasing treatment pressure and temperature. The amount of the stereocomplex formed by high-pressure CO₂ was found to be higher than that by thermal annealing in bulk. The heat of melting of the stereocomplex was the highest for the 1/2-1/1 it-PMMA/st-PMMA ratio. Compared with amorphous PMMA, the crystalline stereocomplex induced by high-pressure CO₂ contributes to the superior morphology of the microcellular foams obtained. For the CO₂-treated polymer, the average cell size decreases and the average cell density increases as the amount of the stereocomplex that was formed increases.

Original language	English
Pages (from-to)	6757-6763
Number of pages	7
Journal	Macromolecules
Volume	33
Issue number	18
DOIs	https://doi.org/10.1021/ma000443n
Publication status	Published - 2000 Sept 5
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "CO2-induced stereocomplex formation of stereoregular poly(methyl methacrylate) and microcellular foams",

abstract = "Crystalline stereocomplex formation of isotactic poly(methyl methacrylate) (it-PMMA) and syndiotactic poly(methyl methacrylate) (st-PMMA) induced by high-pressure CO2 at pressures in the 5-35 MPa range and at temperatures in the 30-110 °C range was demonstrated by means of differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) investigations as a function of treatment pressure, temperature, and the it-PMMA/st-PMMA ratio. At a constant it-PMMA/st-PMMA ratio, the melting temperature of the stereocomplexes was shown to increase with increasing treatment pressure and temperature. The amount of the stereocomplex formed by high-pressure CO2 was found to be higher than that by thermal annealing in bulk. The heat of melting of the stereocomplex was the highest for the 1/2-1/1 it-PMMA/st-PMMA ratio. Compared with amorphous PMMA, the crystalline stereocomplex induced by high-pressure CO2 contributes to the superior morphology of the microcellular foams obtained. For the CO2-treated polymer, the average cell size decreases and the average cell density increases as the amount of the stereocomplex that was formed increases.",

author = "Tomohiro Mizumoto and Norio Sugimura and Masahiko Moritani and Yoshiyuki Sato and Hirokatsu Masuoka",

year = "2000",

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T1 - CO2-induced stereocomplex formation of stereoregular poly(methyl methacrylate) and microcellular foams

AU - Mizumoto, Tomohiro

AU - Sugimura, Norio

AU - Moritani, Masahiko

AU - Sato, Yoshiyuki

AU - Masuoka, Hirokatsu

PY - 2000/9/5

Y1 - 2000/9/5

N2 - Crystalline stereocomplex formation of isotactic poly(methyl methacrylate) (it-PMMA) and syndiotactic poly(methyl methacrylate) (st-PMMA) induced by high-pressure CO2 at pressures in the 5-35 MPa range and at temperatures in the 30-110 °C range was demonstrated by means of differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) investigations as a function of treatment pressure, temperature, and the it-PMMA/st-PMMA ratio. At a constant it-PMMA/st-PMMA ratio, the melting temperature of the stereocomplexes was shown to increase with increasing treatment pressure and temperature. The amount of the stereocomplex formed by high-pressure CO2 was found to be higher than that by thermal annealing in bulk. The heat of melting of the stereocomplex was the highest for the 1/2-1/1 it-PMMA/st-PMMA ratio. Compared with amorphous PMMA, the crystalline stereocomplex induced by high-pressure CO2 contributes to the superior morphology of the microcellular foams obtained. For the CO2-treated polymer, the average cell size decreases and the average cell density increases as the amount of the stereocomplex that was formed increases.

AB - Crystalline stereocomplex formation of isotactic poly(methyl methacrylate) (it-PMMA) and syndiotactic poly(methyl methacrylate) (st-PMMA) induced by high-pressure CO2 at pressures in the 5-35 MPa range and at temperatures in the 30-110 °C range was demonstrated by means of differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) investigations as a function of treatment pressure, temperature, and the it-PMMA/st-PMMA ratio. At a constant it-PMMA/st-PMMA ratio, the melting temperature of the stereocomplexes was shown to increase with increasing treatment pressure and temperature. The amount of the stereocomplex formed by high-pressure CO2 was found to be higher than that by thermal annealing in bulk. The heat of melting of the stereocomplex was the highest for the 1/2-1/1 it-PMMA/st-PMMA ratio. Compared with amorphous PMMA, the crystalline stereocomplex induced by high-pressure CO2 contributes to the superior morphology of the microcellular foams obtained. For the CO2-treated polymer, the average cell size decreases and the average cell density increases as the amount of the stereocomplex that was formed increases.

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CO₂-induced stereocomplex formation of stereoregular poly(methyl methacrylate) and microcellular foams

Abstract

ASJC Scopus subject areas

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