Molar mass of poly (ethylene terephthalate) (PET) during ultimate uniaxial drawing
Copyright policy )Molar mass of poly (ethylene terephthalate) (PET) during ultimate uniaxial drawing
AbstractThe changes of the average molar mass Mw, Mn, Mz, and molar mass distributions during multistep uniaxial drawing of poly(ethylene terephthalate) (PET) to achieve ultimate mechanical properties have been studied in detail by means of size exclusion chromatography (SEC) with triple detection: concentration, viscosimetry, and light scattering, using HFIP as solvent. An increase in molar mass of PET due to post‐polycondensation and/or transesterfication during drawing at a high temperature of 160 to 230°C was found. Moreover, drawing leads to crystallization and large orientation in the amorphous phase, which results in lower molecular mobility and prevents a further growth in chain length. Crazing under extreme drawing conditions occurs and affects a decrease in molar mass.
- University of Technology Russian Federation
- Technical University Eindhoven Netherlands
- Delft University of Technology Netherlands
Polycondensation, Esterification, Concentration (process), Viscosity measurement, Light scattering, Mechanical properties, Ultimate uniaxial drawing, Molecular dynamics, Molecular mobility, Organic solvents, Drawing (forming), Transesterification, Size exclusion chromatography, Molar mass, Polyethylene terephthalates, Crystallization, Crazing
Polycondensation, Esterification, Concentration (process), Viscosity measurement, Light scattering, Mechanical properties, Ultimate uniaxial drawing, Molecular dynamics, Molecular mobility, Organic solvents, Drawing (forming), Transesterification, Size exclusion chromatography, Molar mass, Polyethylene terephthalates, Crystallization, Crazing
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