Abstract
Abstract This study gave an insight on the effect of shear modification on molecular degradation of polyamide (Nylon) 6. It also studied the feasibility of utilizing mould filling simulation package to predict shear modification and degradation in injection molded product without the need for tedious molecular weight assessment. Injection molding procedure and mould filling simulations were implemented by varying mould configuration, injection pressure and melt temperature. Viscosity number test was performed to check the molecular weight changes of the samples with respect to the moulding parameters. Results showed that shear modifications caused some level of molecular degradation within the samples by lowering the molecular weight if compared with that of obtained from the original pellets. Shear modification was found to significantly affected by the mould configuration, melt temperature and injection pressure as displayed by the mould filling simulation results. The simulation results have also successfully shown useful correlation between shear modification mapping and molecular degradation measurement obtained via viscosity number test.
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