Study on Impact Strength of ABS Resins III. Analysis between Craze and Izod Impact Strength by TEM Observation of Impact Fractured Specimens on Acrylonitrile-Butadiene-Styrene(ABS) Polymer.

Abstract

The number (NC) of crazes nucleated by a rubber particle and the breadth (BC) of a craze depend on the particle diameter of rubber by TEM observation of Izod impact fractured specimens. The values of NC and BC were influenced by the deformation degree of the rubber particles. The Izod impact strength was quantitatively explained by total craze volume of whitened region of impact fractured specimens. However this relationship was influenced by the rubber structure (occlusion structure).

Morphology and physical properties of SAN/NBR blends: The effect of AN content in NBR

“…These results and Figure 1 show that the optimum average rubber diameter for toughening SAN/NBR blend is about 0.7 μm. Because toughening is a complicated process where many variables can alter the optimum rubber diameter, the difference in kind or amount of rubber might be illustrated as the cause of the discrepancy of this study from previous reports8, 9 about optimum rubber diameter.…”

“…Because crazing is more likely to be initiated at large rubber particles and cavitation is more likely to occur at small rubber particles, the plot of toughness versus rubber particles size at a constant amount of rubber gives a bell‐shaped curve 8. In SAN/rubber blend, the optimum rubber diameter was reported to be 0.3 μm when the rubber content was 15 wt % 9. In Table IV, we can see that both Izod and Charpy impact strengths show the maximum values in A3.…”

“…Because large rubber particles are more effective in initiating the crazing and small ones are more effective in initiating the yielding, larger particles are preferred for toughening the more brittle matrices, and smaller particles are preferred for toughening the less brittle matrices. For example, the optimum rubber diameter for toughening polystyrene was reported to be 2.5 μm, and that of poly(styrene‐ co ‐acrylonitrile) (SAN) was reported to be 0.75 or 0.3 μm 8, 9…”

Morphology and physical properties of SAN/NBR blends: The effect of AN content and melt viscosity of SAN

“…This can be seen in Figure 2. Figure 2 shows that the size of the void in the rubber phase, created during the fracturing process by the crazing of the rubber phase for energy absorption,9 reduces as the melt viscosity of the SAN matrix is increased. This shows that the size of the dispersed NBR droplet is reduced as the melt viscosity of the SAN matrix is increased.…”

Effects of moisture absorption on fracture behaviors of acrylonitrile-butadiene-styrene resin

“…As a result, SAN resin can be substantially toughened by the incorporation of rubber particles. Recently, Goto and co‐researchers1–3 have systematically researched that three parameters of the rubber phase (i.e., rubber particle size, rubber content, and rubber chemical structure) affect the Izot Impact strength.…”