Premium
Study of heat treatment on the behaviour towards shrinkage, orientation and molecular order of stretched poly(vinyl chloride) fibres
Author(s) -
Cousin Patrice,
Michel Alain
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890230116
Subject(s) - shrinkage , materials science , vinyl chloride , composite material , creep , amorphous solid , viscoplasticity , polymer , deformation (meteorology) , melting temperature , atmospheric temperature range , thermodynamics , crystallography , chemistry , constitutive equation , physics , finite element method , copolymer
The behaviour of stretched PVC fibres during thermomechanical treatments between 110–160°C has been studied. As far as shrinkage is concerned, three ranges of temperature have been characterized. Within the range 100–140°C the poly(vinyl chloride) undergoes a plastic deformation and has an elastoplastic behaviour. From 140 up to 170°C a creep phenomenon superimposes the elastic behaviour and then the polymer has a viscoplastic behaviour. As the temperature increases above 170°C there is flowing of polymer chains and the fibres break rapidly. Annealings carried out between 100 and 150°C cause the formation of ordered domains which are responsible for the formation of a temporary physical crosslinking network which hinders the shrinkage to such a temperature lower than their melting temperature. The loss of orientation of the amorphous phase is a rapid process which takes place as the temperature rises above 100°C even if the applied stress counterbalances the overall strain resulting from the potential shrinkage.