Hydrogen Bonding Strength Modulating Nonisothermal Crystallization Kinetics in Polyamide 5T/56

As a semibiobased copolyamide with outstanding environmental sustainability, polyamide 5T/56 (PA5T/56) blends the excellent processability of aliphatic polyamide 56 (PA56) with the remarkable thermal stability of fully aromatic polyamide 5T (PA5T), thereby substantially enhancing its potential industrial applications. However, its multifunctional performance is critically dependent on crystallization behavior, where hydrogen-bonding interactions serve as the primary thermodynamic driver. This study systematically investigated water-mediated crystallization control in PA5T/56 by regulating initial water content during polymerization. Comprehensive characterization revealed a relationship between water content and key material parameters: lower initial water content enhanced hydrogen bond strength, molecular weight, and thermal stability, while reducing crystallization activation energy. The experimental results revealed that water content systematically modulated hydrogen bond architecture. This control mechanism directly governs crystallization kinetics and final properties, enabling process optimization in PA5T/56 manufacturing.