Determination
and comparison of the essentialwork of fracture (EWF) of two polyester blends |
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| Authors: | L Vincent S N Connolly F Dolan P H Willcocks S A A Jayaweera |
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| Institution: | (1) School of Science and Technology, University of Teesside, Middlesbrough, UK, TS1 3BA, Borough Road;(2) Medtronic/AVE Ireland Ltd, Galway, Ireland, Parkmore Business Park West;(3) ICI, Wilton Centre, Wilton, Redcar, UK, TS10 4RF |
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| Abstract: | The fracture toughness of blends
of polypropylene terephthalate (PPT) with polyethylene terephthalate (PET)
and polybutylene terephthalate (PBT) were investigated. Binary blends were
prepared comprising 10:90, 30:70, 50:50, 70:30 and 90:10 mass/mass%. The fracture
toughness was determined for each blend using the essential work of fracture
(EWF) method and thin film double edge notched tension (DENT) specimens. The
specific essential work of fracture, w
e,
values obtained for blends of PET/PPT ranged from 27.33 to 37.38 kJ m–2
whilst PBT/PPT blends yielded values ranging from 41.78 to 64.23 kJ m–2.
Differential scanning calorimetry (DSC) was employed to assess whether or
not crystallinity levels influence the mechanical properties evaluated. The
fracture toughness of PPT deteriorated with PET incorporation. However, high
we values exceeding that of pure PPT were obtained for PBT/PPT blends across
the composition range studied. |
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| Keywords: | copolyesters essential work of fracture (EWF) terephthalates |
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