Mechanical properties and thermal stability of poly(L‐lactide)/calcium carbonate composites

Abstract

Poly(L-lactide) (PLA) was melt-mixed with micrometer-sized and nanosized calcium carbonate (CaCO 3 ) particles before and after modification with calcium stearate. Adhesion between the CaCO 3 particles and the PLA matrix was assessed qualitatively by scanning electron microscopy observation of the fractured surface morphology of the composites. The effect of the incorporation of the CaCO 3 particles on the thermal stability of the PLA-based composites was quantified by the temperatures corresponding to 5 and 50% of weight loss and the activation energy determined through thermogravimetric analyses of the composites. The tensile strength and modulus values of the composite were improved greatly without a significant loss in the elongation at break when the nanosized CaCO 3 was incorporated up to 30 wt %.

Preparation and Characterization of Poly(lactic Acid)-based Composite Reinforced with Oil Palm Empty Fruit Bunch Fiber and Nanosilica

“…The first one occurred at the range of 80 to 150 °C, which was the evaporation of moisture that occurred during the drying process of the specimens. The second degradation was observed at 270 to 380 °C, which was attributed to the thermal degradation of cellulosic substances of cellulose, hemicelluloses, lignin, and the depolymerization of PLA (Kim et al 2008). As shown in Fig.…”

Preparation and Characterization of Poly(lactic acid)/Poly(butylene adipate-co-terepthalate) Blends and Their Composite

“…This may be caused by the basic nature of CaCO 3 which had catalyzed the depolymerization of the ester bonds of PLA. Thus the thermal stability was decreased [34] . Moreover, the composite left the char residual of CaCO 3 at 4.92%.…”

Processing and properties of antibacterial silver nanoparticle-loaded hemp hurd/poly(lactic acid) biocomposites

“…The constituents of the hemp hurd decomposed in different stages with hemicellulose degrading at 300 C, lignin at 450 C, and cellulose at 550 C [48]. In HH/PLA biocomposites, TGA showed two main degradation regions, where the first region comprises of the thermal degradation of hemicellulose, lignin and cellulose in the HH [49], and the higher temperature region corresponded to the depolymerization of the PLA [50]. The earlier onset of thermal decomposition of the HH/PLA and HH/GMA-g-PLA in comparison to neat PLA indicates that inclusion of HH, which is constituted by low-melting-point lignin and hemicellulose, caused a marginal loss in thermal stability in the biocomposite form.…”