Characterization of the effects of compressed gas annealing on semicrystalline polymers

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DOIResolve DOI: http://doi.org/10.1002/1099-0488(20000915)
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TypeArticle
Journal titleJournal of Polymer Science Part B: Polymer Physics
Volume38
Issue18
Pages24572467; # of pages: 11
SubjectSmall-angle X-ray scattering; Semicrystalline polymers; Compressed gas
AbstractThe effects of annealing semicrystalline polymers in the presence of plasticizing agents is an area of considerable current interest, given the potential to modify the degree and nature of crystallinity. These effects were studied for two semicrystalline polymers, custom-synthesized methyl-substituted poly(aryl ether ether ketone) (MePEEK) and industrial-grade poly(ethylene terephthalate) (PET). Small-angle X-ray scattering (SAXS) was used to characterize the microstructure of both amorphous and preannealed materials. Differential scanning calorimetry (DSC), wide-angle X-ray scattering, and density measurements were also performed for the PET samples, and reference is made to similar analysis work done for MePEEK. A distinct morphological effect could be identified from SAXS measurements of MePEEK annealed in a stepwise fashion in the presence of high-pressure CO₂ with the polar cosolvent CH₃OH. This result was absent in MePEEK similarly annealed in air and supports earlier DSC measurements. A very different morphological effect of pressure alone was observed in PET annealed in pure CO₂ (170 and 510 atm) at a temperature of 150 °C, well above the glass transition.
Publication date
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedNo
NRC number51883
NPARC number13063730
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Record identifier87f5c213-7dc7-41c6-b1a4-6b27f019a044
Record created2009-12-04
Record modified2016-05-09
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