Mechanical properties of amorphous and semi-crystalline semi-aromatic polyamides

Heliyon. 2020 Apr 25;6(4):e03857. doi: 10.1016/j.heliyon.2020.e03857. eCollection 2020 Apr.

Abstract

We investigate the mechanical properties of amorphous and semi-crystalline semi-aromatic polyamides, polyphthalamides (PPA). Three relaxation processes have been identified by DMTA which is consistent with literature for polyamide. PPA exhibit a brittle-to-ductile transition from a low impact strength to a high impact strength. At room temperature, all the studied PPA are brittle. During both tensile and compression experiments, a strain hardening behavior is observed for all the studied samples and is more pronounced in compression. The testing temperature has an influence on the strain hardening modulus, contrary to the crystallinity. Strain hardening gives properties of stability and resistance to damage.

Keywords: Heliyon taxonomy; Materials science; Mechanical properties; Polyamides; Polyphthalamides; Strain hardening.