Abstract: Described herein are polyamide polymers having improved glass transition temperatures (“Tg”) and relatively small values of Tm-Tg, where Tm is the melting temperature of the polyamide polymer. The polyamide polymers are semi-aromatic, semi-crystalline polyamide polymers that include recurring units formed the polycondensation of (1) a linear aliphatic diamine and a cycloaliphatic diamine with (2) an aromatic dicarboxylic acid. Due at least in part to the improved Tg, the polyamide polymers can be desirably incorporated into application settings including, but not limited to, mobile electronic devices, automotive, aerospace, building and construction, oil and gas, industrial, electrical and electronics, consumer goods, medical and healthcare. Furthermore, the polyamide polymers have relatively small values of Tm-Tg and, therefore, articles including the polyamide polymers can be more efficiently produced due to relatively small cycle times.