Effects of high pressure on amorphous polymers. II. Annealing of densified polymethyl methacrylate

R. M. Kimmel; D. R. Uhlmann

doi:10.1063/1.1660464

Effects of high pressure on amorphous polymers. II. Annealing of densified polymethyl methacrylate

R. M. Kimmel, D. R. Uhlmann

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Abstract

The annealing at atmospheric pressure of polymethyl methacrylate (PMMA) densified in various pressure-temperature-time cycles has been examined in the temperature range 25°-90°C. PMMA densified in the glassy state was found to be less stable than that densified by cooling through the glass transition under pressure, in agreement with previous results on inorganic glasses. Moreover, the relative stability of densified PMMA depended on the sample residence time in the glass transition region at pressure. In the one case where an energy spectrum for annealing could be calculated, the data indicated a multiplicity of molecular processes with activation energies in the range 14-19 kcal/mole.

Original language	English (US)
Pages (from-to)	1892-1896
Number of pages	5
Journal	Journal of Applied Physics
Volume	42
Issue number	5
DOIs	https://doi.org/10.1063/1.1660464
State	Published - 1971
Externally published	Yes

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General Physics and Astronomy

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10.1063/1.1660464

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title = "Effects of high pressure on amorphous polymers. II. Annealing of densified polymethyl methacrylate",

abstract = "The annealing at atmospheric pressure of polymethyl methacrylate (PMMA) densified in various pressure-temperature-time cycles has been examined in the temperature range 25°-90°C. PMMA densified in the glassy state was found to be less stable than that densified by cooling through the glass transition under pressure, in agreement with previous results on inorganic glasses. Moreover, the relative stability of densified PMMA depended on the sample residence time in the glass transition region at pressure. In the one case where an energy spectrum for annealing could be calculated, the data indicated a multiplicity of molecular processes with activation energies in the range 14-19 kcal/mole.",

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year = "1971",

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AU - Uhlmann, D. R.

PY - 1971

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N2 - The annealing at atmospheric pressure of polymethyl methacrylate (PMMA) densified in various pressure-temperature-time cycles has been examined in the temperature range 25°-90°C. PMMA densified in the glassy state was found to be less stable than that densified by cooling through the glass transition under pressure, in agreement with previous results on inorganic glasses. Moreover, the relative stability of densified PMMA depended on the sample residence time in the glass transition region at pressure. In the one case where an energy spectrum for annealing could be calculated, the data indicated a multiplicity of molecular processes with activation energies in the range 14-19 kcal/mole.

AB - The annealing at atmospheric pressure of polymethyl methacrylate (PMMA) densified in various pressure-temperature-time cycles has been examined in the temperature range 25°-90°C. PMMA densified in the glassy state was found to be less stable than that densified by cooling through the glass transition under pressure, in agreement with previous results on inorganic glasses. Moreover, the relative stability of densified PMMA depended on the sample residence time in the glass transition region at pressure. In the one case where an energy spectrum for annealing could be calculated, the data indicated a multiplicity of molecular processes with activation energies in the range 14-19 kcal/mole.

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Effects of high pressure on amorphous polymers. II. Annealing of densified polymethyl methacrylate

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