Determination
and comparison of the plane stress essentialwork of fracture of three polyesters
PET, PPT and PBT |
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| Authors: | L Vincent S N Connolly F Dolan P H Willcocks S A A Jayaweera R Pendlebury |
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| Institution: | (1) Institute of Engineering Mechanics, Beijing JiaoTong University, Beijing, 100044, China;(2) Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China |
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| Abstract: | The essential work of fracture
(EWF) method has been used to study the relationship between molecular structure
and thin film fracture toughness for three ductile polyesters at ambient temperature.
The fracture toughness of PPT is of particular interest. Successful fracture
characterisation of thin film polyesters has been achieved by the EWF method
using double edge notched tension (DENT) specimens. The specific essential
work of fracture, w
e,
for polyethylene terephthalate (PET), polypropylene terephthalate (PPT) and
polybutylene terephthalate (PBT) films is found to be 35.54±2.56, 41.03±3.23
and 31.34±8.60 kJ m–2, respectively.
Differential scanning calorimetry (DSC) has been employed to investigate the
crystallinity of the polymers concerned and the effect of this on their EWF
values. |
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| Keywords: | |
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