Study on rheological properties of bio-based semi-aromatic high temperature polyamide PA5T/56 and the effect of PA5T content

In this paper, the rheological properties of bio-based semi-aromatic high temperature polyamide PA5T/56 were studied by melt index meter and rotational rheometer, and the effect of PA5T content on the rheological properties was discussed. The results showed that the melt index of PA5T/56 decreased with the increase in PA5T content; The bio-based semi-aromatic high temperature polyamide PA5T/56 with different ratios was pseudoplastic fluids, and its non-Newtonian index increased with the increase in temperature, the increase in PA5T content can improve the sensitivity of apparent viscosity to shear stress and shear rate; The apparent viscosity reduced with the increase in shear stress or shear rate; With the increase in shear rate, the viscous flow activation energy decreased, and the apparent viscosity was less sensitive to temperature; With the increase in PA5T content, the viscous flow activation energy of PA5T/56 increased gradually, indicated that the increase in PA5T content can improve the temperature sensitivity of PA5T/56 apparent viscosity; Therefore, in the synthesis and post-treatment of PA5T/56 material, in order to improve its processing properties, make the operation easier and reduce the economic cost, it can be improved by adjusting the processes such as shear stress, shear rate and the ratio of PA5T/56 components.