Abstract
The observation of multiple melting phenomena in poly(ethylene terephtha- late) (PET) by DSC or DTA has been confirmed to arise from recrystallization by the changes in birefringence occurring in the thermal regime of the polymer. Isothermal birefringence changes illustrate the melting of crystallites around 230–248 °C, with the formation of more perfect and higher melting crystallites at temperatures of annealing above 248°C. The formation of diethylene glycol residues in the PET during solid state polymerization may be a cause of the higher melting endotherm occurring at lower temperatures when annealed under vacuum.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
