Tensile behavior of polypropylene blended with bimodal distribution of styrene‐ethylene‐butadiene‐styrene particle size

Abstract

ABSTRACT:The objective is to characterize the effects of the bimodal distribution of rubber particles and its blend ratio on the mechanical properties of the thermoplastic polypropylene blended with two different styrene-ethylenebutadiene-styrene triblock copolymer at the intermediate and high strain rates. Tensile tests are conducted at the nominal strain rates from 3 3 10 21 to 10 2 (1/s). Phase morphology is investigated to estimate the bimodal rubber particle size distribution. In addition, the in situ observation is conducted during uniaxially stretching within transmission electron microscopy step by step to investigate the deformation events depending on the elongation of samples. The elastic modulus increased gradually as the blend ratio of large rubber particle increased. An increase in the rupture strain and the strain energy up to failure was found for the bimodal rubber particle distributed blend system where the blend ratios of small rubber particle and large rubber particle were same. This is because the smaller particles dominant blend systems show the bandlike craze deformation while the localized plastic deformation is taken place in the larger particles dominated blend systems. The synergistic effect of these rubber particles gives rise to a strong increase in the ductility of these bimodal rubber particle distributed polypropylene systems.

Tensile and fatigue behavior of layered acrylonitrile butadiene styrene

“…Crazing generally occurs when localized regions yield, forming an interconnected array of microvoids (Mae et al, 2008). Craze bands formed perpendicular to the loading axis, and failure occurred within these whitened areas where some evidence of localized fiber delamination was also observed.…”

Effect of Total Rubber Content on Ductility of Polypropylene Blended with Bimodal Distribution of Styrene-Ethylene-Butadiene-Styrene Particle Size

“…In this study, two blends (SEBS A/ SEBS B = 5/5 and 10/10 wt %) were observed by TEM. 9) In our previous study, three blends (SEBS A/SEBS B = 7.5/22.5, 15/15 and 22.5/7.5 wt %) were observed by TEM. The obtained results showed that the two step blending procedure worked well for making the bimodal particle size distribution in the present blends.…”

Characterization of material ductility of PP/EPR/talc blend under wide range of stress triaxiality at intermediate and high strain rates

“…The elliptical shape of elastomer particles was also obtained in the other elastomer blended PP produced by injection molding in the previous studies by the same author. 6,[13][14][15][16][17] The mean approximate diameter of EPR was 0.7 lm based on the image analysis. In the image analysis, the commercial based software (Azo-kun, Asahi Kasei Engineering, Japan) was used.…”