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Jar, P.‐Y. Ben; Kuboki, Takashi; Takahashi, K.

doi:10.1023/a:1018597201270

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…The TEM samples were prepared by staining the fractured specimens in the vapor of an OsO 4 solution of 2 wt % for 48 h, which were then sliced to thin sections of approximately 100 nm thick using an ultramicrotome (Reichert Jung Ultracut) equipped with a Diatome diamond knife. Details of the TEM sample preparation can be found in ref . A Hitachi H7100 TEM operated at 75 kV was used for the deformation observation.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Deformation of High-Impact Polystyrene under Uniaxial Tension at Various Strain Rates

et al. 2002

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Tensile properties of two high-impact polystyrenes (HIPS), named 0.84S and 0.45S, were evaluated at four strain rates, from 2.7 × 10-3 to 1.8 × 10 s-1, using un-notched dumbbell specimens. Under the strain rates up to 1.6 × 10-1 s-1, 0.84S showed slightly higher fracture energy than 0.45S, where the fracture energy is defined as the total area under the force−displacement curve. However, when the strain rate was further increased to 1.8 × 10 s-1, the difference was remarkably increased, due to a dramatic increase of the fracture energy for 0.84S at the highest strain rate, 1.8 × 10 s-1. The high fracture energy for 0.84S was found to come mainly from the fracture strain. The microscopic examination, using optical microscopy and transmission electron microscopy (TEM), shows the trend of deformation behavior, which supports the tensile test results, and suggests that the adiabatic deformation process, which has long been known to cause the fracture energy increase at high strain rates for many polymers, does not provide a satisfactory explanation for the results presented here. Instead, it is believed that at the highest strain rate the molecular stretch, instead of the molecular flow, dominated the craze fibril deformation and resulted in the craze proliferation around the rubber particle. Such a craze proliferation mechanism did not occur in 0.45S, because unlike 0.84S, the displacement misfit between particle and matrix was insufficient to initiate crazes. As a result, the fracture strain and the fracture energy were limited. We conclude from the study that the different capability to initiate crazes is a dominant factor for the significantly different fracture energy of the two HIPS at the highest strain rate.

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Section: Methodsmentioning

confidence: 99%

Mechanical Deformation of High-Impact Polystyrene under Uniaxial Tension at Various Strain Rates

et al. 2002

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Mechanical properties and deformation mechanisms in high thermal resistant poly(acrylonitrile‐butadiene‐styrene) under static tension and Izod impact

Jar

Creagh

Konishi

et al. 2002

J of Applied Polymer Sci

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Deformation mechanisms in a high thermal resistant poly(acrylonitrilebutadiene-styrene) (ABS) were investigated using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). The work followed our previous study, in which TEM was used for the craze observation and SAXS for the shear yielding, to evaluate the relationship between the mechanical properties and the deformation mechanisms of the ABS under static tension and Izod impact. The current results support our previous conclusion that the combination of TEM and SAXS enables us to identify the deformation mechanisms in the ABS, and provide new evidence for the coexistence of crazing and shear yielding. The SAXS patterns suggest that shear yielding occurred in the ABS, even under the impact loading. We concluded from the study that the occurrence of shear yielding had a major effect on the toughness enhancement of the ABS.

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Identification of deformation behavior in high‐thermal‐resistant poly(acrylonitrile‐butadiene‐styrene) (ABS)

Jar

Lee

Creagh

et al. 2001

J of Applied Polymer Sci

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Deformation mechanisms in postfractured high-thermal-resistant poly(acrylonitrile-butadiene-styrene) (ABS) were investigated using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Although crazes were clearly identified by TEM, they were not detectable by SAXS. This was possibly due to a short distance between sample and imaging plate in the SAXS set-up and invisibility of craze fibril scattering from the postfractured samples. A rhomboid-shaped SAXS pattern was obtained from ABS samples with high ductility but with no crazes shown in the TEM micrographs. It is believed that the rhomboid-shaped SAXS pattern was generated from matrix shear yielding. The results show that a combination of TEM and SAXS enable us to distinguish crazing and shear yielding in the postfractured ABS.

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Cited by 5 publications

References 3 publications

Mechanical Deformation of High-Impact Polystyrene under Uniaxial Tension at Various Strain Rates

Mechanical Deformation of High-Impact Polystyrene under Uniaxial Tension at Various Strain Rates

Mechanical properties and deformation mechanisms in high thermal resistant poly(acrylonitrile‐butadiene‐styrene) under static tension and Izod impact

Identification of deformation behavior in high‐thermal‐resistant poly(acrylonitrile‐butadiene‐styrene) (ABS)

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