Influence of comonomer DCA on thermal, crystallization, and mechanical characteristics of bio-based semi-aromatic PA10T

In this study, the semi-aromatic poly (decamethylene terephthalamide) acid (PA10T) and an array of PA10T/1010 with various copolymerization content of the third monomer 1,10-decanedioic acid (DCA) were synthesized using a productive one-step melt polycondensation method. Importantly, the addition of DCA’s effect for PA10T on crystallization behaviors, thermal properties, and mechanical performances were extensively investigated. Additionally, the results of DSC demonstrate that all the melting temperature of PA10T/1010 copolyamides are significantly lower than PA10T by introducing the third monomer DCA, and the heat stability has been not significantly affected according to the results of TGA, suggesting the improvement of processing properties. Besides, compared with PA10T, the bending modulus, breaking elongation, tensile strength, and izod impact strength of PA10T/1010-1 all increase obviously, when the feed ratio of DCA and terephthalic acid (PTA) is 10:90. Thus, introducing bio-based DCA for copolymerization is a promising method to enhance both the processing and mechanical properties of PA10T.