Computer modelling of rubber-toughened plastics
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A computer model has been developed which shows that high-impact polystyrene (HIPS) surface roughness (gloss) depends heavily on rubber phase volume and rubber particle size distribution parameters. The model has been developed in a series of steps. First, several tools have been created for isolation and display of rubber particles near the surface of computer-generated resins. Next, a technique for choosing surface points has been devised, using an algorithm which allows the surface to be disturbed by any particle near the surface. In step three, a non-linear fit of the surface points produces an abstract surface in the form of a grid. The variability in the array of grid points is a measure of surface roughness. The measured surface roughness of conventional high-impact polystyrene resins correlates to the variables identified by the model. A high percentage of the surface roughness variability has been explained in a correlation using average rubber particle size and rubber phase volume, showing the linear regression approach to be good for prediction of the surface roughness of conventional HIPS resins.
KeywordsSurface Roughness Rubber Particle Size Distribution Measured Surface Regression Approach
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