AbstractThe influence of the quantity (gel‐), the degree of crosslinking (swelling index), and the particle size (mean cord) of the elastomeric phase on Izod impact strength of rubber‐reinforced polystyrene has been investigated. It has been observed that (particle size being 2–3 μ) impact strength increases almost linearly with gel content and the slope of the curves increases with decreasing degree of crosslinking. This relation proved to be no more linear for different particle sizes: small particles prove more effective than other particles in the high gel‐ range and less in the low gel‐ range. These results are discussed in the light of theories of rubber toughening in polystyrene and on the basis of data from Izod tests with recorded stress–time curve as well as of electron micrographs of fract
展开▼
