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

Content Provider	Springer Nature Link
Author	Mehrabi Mazidi, M. Razavi Aghjeh, M. K. Abbasi, F.
Copyright Year	2012
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.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	19
Issue Number	8
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rubber particles Interparticle distance Toughness Strain softening Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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