The specific non-essential work of fracture, , and increased with increasing the TPU contents which is confirmed by load-displacement curves. The obtained results indicated that displacement up to the failure point increased by increasing the TPU content, while inclusion of CNTs reduced this quantity. Energy dissipation in the yielding and tearing stages determined by the energy partitioning method.
#Cdda to hit vs dispersio crack#
According to EWF results, both the crack resistance and plastic deformation energies promoted in all compounds as compared to neat PBT. The results of EWF tests revealed an effective role of TPU and CNTs in toughening mechanism of binary blends and ternary nanocomposites. Essential work of fracture (EWF) approach is used to study the fracture properties in details. In this paper, fracture toughness evaluation of polybutylene terephthalate (PBT)/thermoplastic polyurethane (TPU) binary blends and PBT/TPU/carbon nanotubes (CNTs) ternary nanocomposites have been conducted using both Izod impact and quasi-static fracture tests. The storage modulus of PBT/TPU/CNT nanocomposite containing 0.5 wt% CNT was comparable with that of pure PBT particularly at high temperatures. Dynamic mechanical thermal analysis revealed that the incorporation of CNTs into PBT/TPU enhanced storage modulus and heightened glass transition temperature. The inclusion of CNTs to PBT/TPU blend led to the substantial improvements in tensile and flexural strengths and moduli. The existence of TPU in PBT caused significant enhancement in notch-impact resistant. The addition of TPU to PBT reduced crystallization rate and melt temperature, while inclusion of CNTs had nucleation effect and increased the degree of crystallinity, crystallization, and melt temperatures. Morphology studies showed good compatibility between the two polymeric phases in PBT/TPU. Different compositions prepared via melt mixing. This research studies the properties of poly (butylene terephthalate) (PBT)-based systems toughened with thermoplastic polyurethane (TPU 10, 20, and 30 wt%) and reinforced with multiwalled carbon nanotubes (CNTs 0.1, 0.2, and 0.3 wt%).
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