Biocarbon-filled polyphthalamide composites were made, achieving comparable mechanical and thermal characteristics to talc-filled ones, at a lower density.

The focus of this review is on the family of polymers commonly known as polyphthalamide (PPA), employed in the automotive industry along with other industries. This includes electrical parts, manufacturing or oil extraction because of PPAs chemical resistance, high strength, stiffness at high temperature, and dimensional stability. A significant amount of research was found and was divided into two main sections: first, PPA and its blends, and second, PPA composites. A consistent notation was devised to aid the understanding of older sources and enhance the comparison between different materials, increasing comprehension. Undiscovered or unpublished properties of PPAs means that there is a rich vein of opportunity, and many studies yet to be performed. This will open up a plethora of breakthrough research in electrical vehicle and aerospace applications.

This paper studies the structure–property–processing relationship of polyphthalamide (PPA) PPA/polyamide 4,10 (PA410) blends, via co-relating their thermal-mechanical properties with their morphology, crystallization, and viscoelastic properties. When compared to neat PPA, the blends show improved processability with a lower processing temperature (20 °C lower than neat PPA) along with a higher modulus/strength and heat deflection temperature (HDT). The maximum tensile modulus is that of the 25PPA/75PA410 blend, ~3 GPa, 25% higher than neat PPA (~2.4 GPa). 25PPA/75PA410 also exhibits the highest HDT (136 °C) among all the blends, being 11% more than PPA (122 °C). The increase in the thermo-mechanical properties of the blends is explained by the partial miscibility between the two polymers. The blends improve the processing performance of PPA and broaden its applicability.

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