Toughened thermoplastics: 2. Impact properties and fracture mechanisms of rubber modified poly(butylene terephthalates)

Hourston, D. J.; Lane, S. J.; Zhang, H.X.

doi:10.1016/0032-3861(91)90049-o

Cited by 42 publications

(13 citation statements)

References 18 publications

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“…21 Apart from this, the shear bands also present a barrier to the propagation of crazes, and hence, crack growth, 1 subsequently, delaying the failure of the material. Similar observations were also reported by Cruz et al 22 on methacrylate-butadiene-styrene (MBS) core shell-modified PBT, Hourston et al 23 on PBT-(butadiene-co-acrylonitrile) blends, and also Wang et al 12 on epoxidized ethylene propylene diene toughened PBT.…”

Section: Fracture Testsupporting

confidence: 75%

Fracture behavior of rubber‐modified injection molded poly(butylene terephthalate) with and without short glass fiber reinforcement

Yow

Ishiaku

Ishak

et al. 2002

J of Applied Polymer Sci

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Fracture behavior of poly(butylene terephthalate) (PBT) and its rubbertoughened (RT) 10 wt %) grades; ethylene-co-glycidyl methacrylate-co-methacrylate terpolymer-toughened poly(butylene terephthalate) PBT/AX8900 (90/10), and Paraloid acrylic-based rubber-toughened poly(butylene terephthalate) PBT/EX2314 (90/10) was investigated using the fracture mechanics approach. The effects of controlling parameters such as type of impact modifier and deformation rate on fracture behavior of PBT and RT-PBT were investigated. Fracture tests were carried out on notched compact tension (CT) specimens. Fracture toughness, K c , and fracture energy, G c , of PBT decreased as the test speed increased from 1 to 500 mm/min. An opposite trend was observed in PBT/AX8900 and PBT/EXL2314. The fracture properties of 30 wt % short glass fiber-reinforced PBT (SGF-PBT) and 10 wt % impact-modified PBT composite (SGF-RT-PBT) were also studied. Incorporation of SGF into PBT has profoundly increased the fracture properties both at high and low speed. However, inclusion of 10 wt % of AX8900 into the reinforced PBT (PBT/AX8900/SGF) (60/10/30) adversely affected the fracture properties. EXL2314, on the other hand, showed a different effect, especially at high testing speed. Both types of impact modifiers were able to retain the flexural strength and flexural modulus of PBT. However, PBT/EXL2314 showed a better retention of flexural properties than PBT/AX8900. Incorporation of SGF in the EXL2314-toughened PBT, i.e., PBT/EXL2314/SGF (60/10/30) also gave a better balance of flexural properties compared to PBT/AX8900/SGF (60/10/30). Both PBT/AX8900 and PBT/EXL2314 showed enhancement of impact strength on the unnotched specimens. The failure modes of CT and impact specimens of PBT, RT-PBTs, and SGF-RT-PBTs were assessed using a scanning electron microscope (SEM). Brittle failure was observed for CT specimens of PBT at high testing speed, while incorporation of the impact modifier AX8900 and EXL2314 resulted in a shift of failure mode from brittle to ductile. SEM micrographs also revealed extensive fiber pull out in SGF-PBT and SGF-RT-PBT.

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Section: Fracture Testsupporting

confidence: 75%

Fracture behavior of rubber‐modified injection molded poly(butylene terephthalate) with and without short glass fiber reinforcement

Yow

Ishiaku

Ishak

et al. 2002

J of Applied Polymer Sci

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“…Hence, the dominant energy absorbing properties are different in different blends. Toughening can be explained by involving two major deformation mechanisms of shear yielding and crazing [2], but deformation and cavitations also plays an important role in polymeric blends. Polypropylene (PP) is characterized by poor low temperature impact behavior due to its relatively high glass-transition temperature (T g ).…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

Chauhan

Soni

Singh

2010

Int J Plast Technol

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An attempt has been made to study the mechanical, viscoelastic and morphological behavior of various dynamically cross-linked blends of isotactic polypropylene (iPP) with ethylene-propylene diene rubber (EPDM) and nitrile rubber (NBR) were examined and compared with these of uncross-linked blends of iPP/EPDM/NBR. These blends were prepared by melt blending in an internal mixer at 190°C in the composition range of 10-40 wt. % EPDM/NBR elastomeric content. The variation in the strength of fibrils of the craze, yield stress and the number density of the EPDM/NBR elastomeric domains (morphology) which are important factors for enhancing the interfacial adhesion and toughness in dynamically crosslinked blends were determined. The toughness and ductility of these blends were discussed with main emphasis on the composition between crack formation and the degree of plastic deformation through crazing and shear yielding. The physicomechanical properties such as hardness, impact strength, flexural strength and flexural modulus of dynamically cross-linked blends were found to be consistent and displayed enhanced mechanical properties values as compared with uncross-linked blends. The decreases in crystallinity and nucleation effect in cross-linked blends of iPP/EPDM/NBR were considered to contribute in the improvement in the impact strength behavior of the blends prepared.

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“…Commercial impact-modified PBT grades (Table 19.33) exhibit notched Izod impact strengths in excess of 500 J/m, while retaining a good level of modulus, strength, and DTUL. In these blends, the dispersed rubber particles promote multiple sites for crazing and shear yielding in the PBT matrix, thus providing mechanisms for energy dissipation during impact deformation and hence offering resistance to crack propagation (Hourston et al 1991).…”

Section: Pbt/elastomer Blendsmentioning

confidence: 99%

Commercial Polymer Blends

Akkapeddi¹

2014

Polymer Blends Handbook

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Toughened thermoplastics: 2. Impact properties and fracture mechanisms of rubber modified poly(butylene terephthalates)

Cited by 42 publications

References 18 publications

Fracture behavior of rubber‐modified injection molded poly(butylene terephthalate) with and without short glass fiber reinforcement

Fracture behavior of rubber‐modified injection molded poly(butylene terephthalate) with and without short glass fiber reinforcement

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

Commercial Polymer Blends

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