Title
Molar mass of poly(ethylene terephthalate) (PET) during ultimate uniaxial drawing
Author
Göschel, U.
Cools, P.J.C.H.
Centraal Instituut voor Voedingsonderzoek TNO
Publication year
2000
Abstract
The 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 transesterification 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.
Subject
Nutrition
Concentration (process)
Crazing
Crystallization
Drawing (forming)
Esterification
Light scattering
Mechanical properties
Molecular dynamics
Organic solvents
Polycondensation
Size exclusion chromatography
Viscosity measurement
Molar mass
Molecular mobility
Transesterification
Ultimate uniaxial drawing
Polyethylene terephthalates
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TNO identifier
88908
ISSN
0032-3888
Source
Polymer Engineering and Science, 40 (7), 1596-1605
Document type
article