Physical and mechanical properties of poly(L‐lactic acid) nucleated by dibenzoylhydrazide compound

Abstract

Benzoylhydrazide compounds were evaluated as a nucleating agent for poly(L-lactic acid) (PLA). From the results of the differential scanning calorimetry, octamethylenedicarboxylic dibenzoylhydrazide (OMBH) was found to be most effective for acceleration of PLA crystallization under higher cooling rate of À508C min À1. PLA with OMBH of 1 wt % exhibited very short crystallization half-time with wide range of isothermal temperature from 90 to 1308C. The molding cycle time of PLA with OMBH in injection molding was less than 3 min, and the cooling time was one-third of ethylenebis(12-hydroxystearylamide)/talc system as a nucleating agent. Physical and mechanical properties improved extremely, and the heat distortion temperature of 1248C, flexural modulus of 4.1 GPa, and Izod impact strength of 7.9 kJ m À2 were achieved. This indicates that the utilization of OMBH makes it possible to extend the application range of PLA as automotive parts and electric appliances, which require higher heat resistance and stiffness.

Effect of nucleation and plasticization on the crystallization of poly(lactic acid)

“…In another study, a series of organic compounds having hydrazide end-groups were evaluated in terms of their nucleating abilities. Best results, obtained with benzoylhydrazide compounds, showed increased crystallization temperature upon cooling and led to fully crystallized samples at moderate cooling rates (À20 C/min) [19]. Unfortunately, these compounds are not readily available as they have only been synthesized at the laboratory scale.…”

“…There is currently no systematic study on the effect of molding conditions on the crystalline development in PLA. Recently, however, it was shown that PLA nucleated with organic compounds (benzoylhydrazide compounds) could be molded into highly crystalline parts [30]. The increased heat distortion temperature, over 120 C, clearly exhibits the benefits of fully crystallized PLA.…”

Correlating the morphology of poly(L-lactide)/poly(butylene succinate)/graphene oxide blends nanocomposites with their crystallization behavior

“…Chen et al [2] found that a reactive organoclay with glycidyl functionality acts as a compatibilizer for PLLA/PBS blends, improving the elongation at break and tensile modulus [4]. Homklin et al [8] clarified the effect of nucleating agents on the PLLA/PBS blend properties: adding nano-sized calcium carbonate or sodium benzoate improved mechanical properties, processability, and productivity in mold processing of the blend [26]. Yokohara et al [4] reported that cellulose nanocrystals improved the barrier properties and increased the Young modulus of the blend.…”

Synthesis and Performance of N‐(Benzoyl) Stearic Acid Hydrazide

“…Besides the traditional fields of synthetic intermediates 1,2 , material chemistry 3,4 , amides play an active role in drug discovery 5 , polymer [6][7][8] , etc and obtained a lot of progress. For example, the importance of the amides in polymer has been recently highlighted by Cai and co-workers 6 .…”