Impact behavior and fracture morphology of acrylonitrile–butadiene–styrene resins toughened by linear random styrene–isoprene–butadiene rubber

Abstract

A novel toughening modifier, styrene-isoprene-butadiene rubber (SIBR), was used to improve the impact resistance and toughness of acrylonitrile-butadienestyrene (ABS) resin via bulk polymerization. For comparison, two kinds of ABS samples were prepared: ABS-1 was toughened by a conventional modifier (a low-cis polybutadiene rubber/styrene-butadiene block copolymer), and ABS-2 was toughened by SIBR. The mechanical properties, microstructures of the as-prepared materials, and fracture surface morphology of the specimens after impact were studied by instrumented notched Izod impact tests and tensile tests, transmission electron microscopy, and scanning electron microscopy, respectively. The mechanical test results show that ABS-2 had a much higher impact strength and elongation at break than ABS-1. The microscopic results suggested that fracture resistance of ABS-1 only depended on voids, shear yielding, and few crazing, which resulted in less ductile fracture behavior. Compared with ABS-1, ABS toughened by linear random SIBR (ABS-2) displayed the synergistic toughening effect of crazing and shear yielding, which could absorb and dissipate massive energy, and presented high ductile fracture behavior. These results were also confirmed by instrumented impact tests.

Polyacrylonitrile reinforced PVA based-polymeric networks: Structural, morphological, and mechanical aspects

“…The tensile strength and percentage elongation values (as given in Table ) were obtained from the load‐displacement behavior of semi‐IPNs having different composition of PVA, PAN and MBA. Their profiles showed a distinct behavior in comparison to the stress‐strain behavior of pure PVA and PAN .…”

Biopolymer nanocomposites based on poly(hydroxybutyrate-co -hydroxyvalerate) reinforced by a non-ionic organoclay

“…The maximum force is the highest load where crack initiation occurs. Thus, the peak force can also be presumed as a threshold beyond which the material fractures . Relatively low values of the maximum load are observed for the PHBV/Mt nanocomposite.…”

“…The conventional total breaking energy is the total fracture energy absorbed during the test and is represented by the area under the force − time curve . This fracture energy is not only dissipated in the crack initiation stage but is also required for the crack propagation stage.…”

Impact behaviour of acrylonitrile-butadiene-styrene after temperature and humidity load

“…ABS-1 sample was toughened with 10 wt% compounded rubber (low-cis PB rubber/styrene-butadiene block copolymer) and ABS-2 sample was made with 12 wt% linear random styreneisoprene-butadiene rubber (SIBR) as a toughening modifier. ABS-2 has much higher impact strength and elongation at break than ABS-1 sample, unlike ABS-1 has higher tensile strength and break strength in comparison with ABS-2 sample [6].…”