Influence of fibre stretching on the microstructure of self-reinforced poly(ethylene terephthalate) composite
2016 (English)In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 35, no 21, 1634-1641 p.Article in journal (Refereed) Published
Self-reinforced poly(ethylene terephthalate) laminates were prepared from woven fabric by compression moulding. The fabric was stretched to different degrees during heating before hot consolidation to simulate a manufacturing process where the material is stretched through forming. High tenacity poly(ethylene terephthalate) fibres with different degrees of stretching were prepared for a comparison to laminates. Tensile tests were made to characterize mechanical properties, while dynamical mechanical analysis, differential scanning calorimetry, FTIR spectroscopy and X-ray diffraction analysis were employed to study microstructural changes caused by the stretching. Tensile tests show that 13% stretching of the fabric increases the laminate tensile stiffness by 34%. However, same degree of stretching for pure fibres increases the fibre tensile stiffness by 111%. Crystallinity and molecular conformations are not influenced by stretching while shrinkage upon heating increases with degree of stretching. Shrinkage is known to be related to disorientation of non-crystalline regions whereof the conclusion from this study is that the increased tensile properties are due to orientation of the non-crystalline regions of the fibre.
Place, publisher, year, edition, pages
2016. Vol. 35, no 21, 1634-1641 p.
Self-reinforced polymer composite, poly(ethylene terephthalate), microstructural analysis, mechanical properties
IdentifiersURN: urn:nbn:se:kth:diva-196978DOI: 10.1177/0731684416662328ISI: 000386959000003ScopusID: 2-s2.0-84994092870OAI: oai:DiVA.org:kth-196978DiVA: diva2:1055970
QC 201612132016-12-132016-11-282016-12-13Bibliographically approved