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Preparation and thermal analysis of polylactic acid/magnesium hydroxide composites

Modification of polylactic acid (PLA) was performed by the addition of magnesium hydroxide (Mg(OH)2) prepared from seawater. Composites with satisfying homogeneity were made by previous preparation of PLA fibres from pellets and their subsequent milling. Differential scanning calorimetry (DSC) was used to study the thermal transitions and crystallinity of PLA/Mg(OH)2 composites. Inorganic filler reduces PLA crystallinity, so doesn’t work like a nucleating agent in PLA composites. The content of Mg(OH)2 from 15 to 20% represents the amount after which the filler has an opposite impact on the thermal properties of PLA. The thermal stability of all samples was investigated by the nonisothermal thermogravimetric analyses (TG). Degradation of PLA and Mg(OH)2 includes only one degradation stage while degradation of PLA/Mg(OH)2 composites have up to six degradation stages. With an increase of Mg(OH)2 content in the composites their thermal degradation becomes more complex and their thermal stability is getting worse.

processing procedure ; PLA/Mg(OH)2 composites ; thermal properties ; thermal stability

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