High-pressure calorimetric study of plasticization of poly(methyl methacrylate) by methane, ethylene, and carbon dioxide

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DOIResolve DOI: http://doi.org/10.1002/(SICI)1099-0488(19961115)34:15<2635::AID-POLB11>3.0.CO;2-7
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TypeArticle
Journal titleJournal of Polymer Science Part B: Polymer Physics
ISSN0887-6266
1099-0488
Volume34
Issue15
Pages26352639; # of pages: 5
SubjectPoly(methyl methacrylae); Compressed gases; Glass transition; Plasticization
AbstractGlass transition in the system poly(methyl methacrylate)/compressed gas was studied as a function of the gas pressure p using a high-pressure Tian-Calvet heat flow calorimeter. Measurements were made on PMMA-CH₄-C₂H₄, and ;-CO₂ at pressures to 200 atm. All three gases plasticize the polymer leading to depression of the glass transition temperature Tg. Trends in the Tg depression were the same as those reported for the solubility of these gases in PMMA; the higher the solubility the larger the depression in Tg. CO₂ was found to be the most effective plasticizer producing a depression of about 40°C at a pressure of about 37 atm. In the low-pressure limit, the pressure coefficient of the glass transition temperature (dTg/dp) was found to be about −0.2°C atm⁻¹ for PMMA-CH₄, the same as that observed for polystyrene-CH₄. For PMMA-C₂H₄, the pressure coefficient was −0.7°C atm⁻¹, which is lower than the value of −0.9°C atm⁻¹ observed for PS-C₂H₄. The pressure coefficient for PMMA-CO₂ was found to be about −1.2°C atm⁻¹, which is larger than the value of −0.9°C atm⁻¹ observed for PS-CO₂.
Publication date
PublisherWiley
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedYes
NRC number37614
NPARC number14273247
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Record identifiere075cd05-7dd1-4a5e-b44c-814edf098820
Record created2010-02-04
Record modified2017-04-06
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