CHEMICAL MODIFICATION OF HIPS WITH N-PHENYLMALEIMIDE

摘要

When the chemical modification of HIPS was carried out in solution a higher modification was attained when using AIBN as initiator, and benzene as solvent. It was also observed that modification occurs in both, polystyrene and butadiene chain segments; nonetheless, a higher tendency for modification to occur in the polystyrene segments was distinguished. Additionally, since HIPS is made up of polystyrene in more than 90 %, modification of N-PM onto HIPS will occur predominantly on the polystyrene segments.When the modification of HEPS was carried out in the melt, the modification was affected mostly by the initial concentration of N-PM; the higher the initial concentration of N-PM , the higher the modification degree attained but the lower the modification efficiency achieved. On the other hand, a combined effect of mixing speed and temperature on the modification degree of HIPS was observed. In addition, it was observed that at constant concentration of N-PM and temperature; the higher the mixing speed and torque generated, the higher the stock temperatures attained, and the higher the modification degree and modification efficiency achieved.Finally, HIPS was modified with N-PM in the melt. This was assessed by FTIR and also by the modificationson the second order transitions, as determined by DSC.