Synergistic Effects of Nucleating Agents and Plasticizers on the Crystallization Behavior of Poly(lactic acid)
Open Access
- 19 January 2015
- Vol. 20 (1), 1579-1593
- https://doi.org/10.3390/molecules20011579
Abstract
The synergistic effect of nucleating agents and plasticizers on the thermal and mechanical performance of PLA nanocomposites was investigated with the objective of increasing the crystallinity and balancing the stiffness and toughness of PLA mechanical properties. Calcium carbonate, halloysite nanotubes, talc and LAK (sulfates) were compared with each other as heterogeneous nucleating agents. Both the DSC isothermal and non-isothermal studies indicated that talc and LAK were the more effective nucleating agents among the selected fillers. Poly(D-lactic acid) (PDLA) acted also as a nucleating agent due to the formation of the PLA stereocomplex. The half crystallization time was reduced by the addition of talc to about 2 min from 37.5 min of pure PLA by the isothermal crystallization study. The dynamic mechanical thermal study (DMTA) indicated that nanofillers acted as both reinforcement fillers and nucleating agents in relation to the higher storage modulus. The plasticized PLA studied by DMTA indicated a decreasing glass transition temperature with the increasing of the PEG content. The addition of nanofiller increased the Young’s modulus. PEG had the plasticization effect of increasing the break deformation, while sharply decreasing the stiffness and strength of PLA. The synergistic effect of nanofillers and plasticizer achieved the balance between stiffness and toughness with well-controlled crystallization.Keywords
This publication has 23 references indexed in Scilit:
- From Lactic Acid to Poly(lactic acid) (PLA): Characterization and Analysis of PLA and Its PrecursorsBiomacromolecules, 2011
- PLA nanocomposites: Effect of filler type on non-isothermal crystallizationThermochimica Acta, 2010
- Poly(lactic acid) modificationsProgress in Polymer Science, 2010
- Synergistic effects of PEG and MWCNTs on crystallization behavior of PLLAJournal of Polymer Science Part B: Polymer Physics, 2010
- Polymorphism and isomorphism in biodegradable polyestersProgress in Polymer Science, 2009
- Polymers from Renewable Resources: A Challenge for the Future of Macromolecular MaterialsMacromolecules, 2008
- Processing technologies for poly(lactic acid)Progress in Polymer Science, 2008
- Polymorphic Transition in Disordered Poly(l-lactide) Crystals Induced by Annealing at Elevated TemperaturesMacromolecules, 2008
- Effect of nucleation and plasticization on the crystallization of poly(lactic acid)Polymer, 2007
- New emerging trends in synthetic biodegradable polymers – Polylactide: A critiqueEuropean Polymer Journal, 2007