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Relationship between microscopic deformations and macroscopic mechanical response of SAN/PB-g-SAN blends via interparticle distance concept

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Abstract

The mechanical properties of SAN/PB-g-SAN blends of different compositions under uniaxial tensile tests were studied. Matrix ligament thickness (MLT) concept was employed to correlate microscopic deformations with macroscopic mechanical response. It was found that, the experimental values of the blends moduli are in a good agreement with the theoretical values obtained from Takayanagi and mixture rules in parallel models. The MLTs in which transition from brittle-to-ductile and from ductile-to-rubbery occur were determined according to interparticle distance model. Fractography studies of the samples with MLT values greater than brittle to ductile transition showed that rubber particles act as craze initiators rather than craze terminators. Due to poor overlapping of stress fields around the particles, no extensive shear yielding took place during the fracture process, leading to unstable macroscopic behavior. For the samples with MLTs smaller than brittle-ductile transition, a necked region developed. The stability of necked region increased with PB-g-SAN content, which resulted in improved post yield deformation stability. This process was accompanied by the participation of larger volume of material in the deformation process and strong overlapping of the stress field around the particles, which facilitated matrix shear yielding. Based on macroscopic response, this delocalized deformation manifested itself by a gradual decrease in load drop after yielding point. For the samples with PB-g-SAN content higher than 75 wt%, the great reduction in MLT and direct interconnection between the neighbor rubber particles caused the appearance of rubbery behavior. These results were also confirmed by analyzing of the fractured surfaces.

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Authors and Affiliations

  1. Institute of Polymeric Materials, Polymer Engineering Department, Sahand University of Technology, Sahand New Town, Tabriz, Iran, P.O. Box :51335–1996

    M. Mehrabi Mazidi, M. K. Razavi Aghjeh & F. Abbasi

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  1. M. Mehrabi Mazidi
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  2. M. K. Razavi Aghjeh
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  3. F. Abbasi
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Correspondence to M. K. Razavi Aghjeh.

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Mehrabi Mazidi, M., Razavi Aghjeh, M.K. & Abbasi, F. Relationship between microscopic deformations and macroscopic mechanical response of SAN/PB-g-SAN blends via interparticle distance concept. J Polym Res 19, 9928 (2012). https://doi.org/10.1007/s10965-012-9928-z

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