Crystallization of Poly (Lactic Acid), PLA: Effect of Nucleating Agents and Structure-Properties Relationships
DOI:
https://doi.org/10.12974/2311-8717.2018.06.5Keywords:
Poly (lactic acid), Crystallization kinetics, Nucleating agents.Abstract
In this paper, a brief state of the art is given firstly on structure-processing-properties relationships on PLA. Secondly, a specific focus is devoted on some recent and not yet unpublished recent work regarding the isothermal and non-isothermal crystallization behaviors of the poly (lactic acid). Thereby, they were investigated by differential scanning calorimetry. The effect of heterogeneous nucleation was assessed by additive talc, ethylenebis (12- hydroxy stearyl amide) (EBHSA) and polyethylene glycol (PEG) as potential nucleating agents. Thus, the improvement of crystallization kinetics under isothermal crystallization was described by the Avrami equation. A new formulation system can be used as a nucleating agent. This system consists of (1% wt talc, 1% wt PEG and x% wt EBHSA), “x” is equal to 1, 3 and 5%. Startling, Its increase the crystallization rate of pure PLA and reduce drastically its half-time of crystallization. Hence, the obtained results are for the great interest of some biopolymer processing as well injection molding or extrusion.
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