Deformation mechanism of polystyrene toughened with sub-micrometer monodisperse rubber particles


Autoria(s): Gao GH; Zhang JS; Yang HD; Zhou C; Zhang HX
Data(s)

2006

Resumo

Core-shell polybutadiene-graft-polystyrene (PB-g-PS) rubber particles with different ratios of polybutadiene to polystyrene were prepared by emulsion polymerization through grafting styrene onto polybutadiene latex. The weight ratio of polybutadiene to polystyrene ranged from 50/50 to 90/10. These core-shell rubber particles were then blended with polystyrene to prepare PS/PB-g-PS blends with a constant rubber content of 20 wt%. PB-g-PS particles with a lower PB/PS ratio (<= 570/30) form a homogeneous dispersion in the polystyrene matrix, and the Izod notched impact strength of these blends is higher than that of commercial high-impact polystyrene (HIPS). It is generally accepted that polystyrene can only be toughened effectively by 1-3 mu m rubber particles through a toughening mechanism of multiple crazings. However, the experimental results show that polystyrene can actually be toughened by monodisperse sub-micrometer rubber particles. Scanning electron micrographs of the fracture surface and stress-whitening zone of blends with a PB/PS ratio of 70/30 in PB-g-PS copolymer reveal a novel toughening mechanism of modified polystyrene, which may be shear yielding of the matrix, promoted by cavitation.

Identificador

http://ir.ciac.jl.cn/handle/322003/16639

http://www.irgrid.ac.cn/handle/1471x/152352

Idioma(s)

英语

Fonte

Gao GH;Zhang JS;Yang HD;Zhou C;Zhang HX.Deformation mechanism of polystyrene toughened with sub-micrometer monodisperse rubber particles,POLYMER INTERNATIONAL,2006,55(11):1215-1221

Palavras-Chave #HIGH-IMPACT POLYSTYRENE #ELASTOMER-MODIFIED EPOXIES #FRACTURE MECHANISMS #CREEP MECHANISMS #HIPS/PPO BLENDS #CAVITATION #SIZE #PLASTICS #POLYMERS #BEHAVIOR
Tipo

期刊论文