Thermal and mechanical properties of poly(L-lactic acid) nucleated with N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide

The modified poly(L-lactic acid) (PLLA) with different contents (0.5−3 wt %) of N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide (NAPH) were prepared to evaluate effects NAPH on melt-crystallization behavior (DSC), thermal degradation (TGA) and mechanical properties PLLA. results demonstrated that as a heterogeneous organic nucleating agent enhanced crystallization ability PLLA in cooling, PLLA/1%NAPH had the best because highest onset temperature sharpest peak. However, also depended cooling rate final melting temperature, overall, relative slow low beneficial for cold-crystallization indicated an inhibition process PLLA, peak shifted towards lower became wider increase concentration. behaviors ofPLLA/NAPH after isothermal-crystallization efficiently reflected accelerating role crystallization; double peaks formed heating thought result from melting-recrystallization, well higher could cause appear regions possess larger enthalpy. A comparative analysis air illustrated addition accelerated decomposition but decrease was inhibited by probable interaction NAPH. Moreover, tensile test showed decreased modulus elongation at break whereas concentration strength than pure