SYNTHESIS OF N,N'-BIS(BENZOYL) DODECANEDIOIC ACID DIHYDRAZIDE AND EFFECT ON NUCLEATION AND MECHANICAL PROPERTIES OF POLY(L-LACTIC ACID)

摘要

N,N'-Bis(benzoyl) dodecanedioic acid dihydrazide (NA) was synthesized by a advanced routes, and the structure of N A had been confirmed by FT-IR, ~1H NMR. The influence of the NA to nucleation and mechanical properties of Poly(L-lactic acid)(PLLA) were investigated. Compared to the neat PLIA, with the addition of 0.8% NA, the crystallization temperature (T_o) increase from 105.88 °C to 125.07 °C and the crystallization enthalpy (△H_c) increase from 1.379 to 29.17 at a cooling rate of 1 °C/min from melt. The low content of NA can increase the mechanical properties of PLLA. Upon addition of 0.5%NA, comparing with the neat PLLA, the tensile strength modulus and elongations at break increase from 74.4 MPa, 3592,8 MPa and 2.72% to 85.3 Mpa, 4266.2 Mpa and 2.98%, respectively. And the impact strength possesses a maximum value for the critical NA loading 1%.