Recent Advances in Production of Ecofriendly Polylactide (PLA)-Calcium Sulfate (Anhydrite II) Composites: From the Evidence of Filler Stability to the Effects of PLA Matrix and Filling on Key Properties.
{"lastName":"Murariu", "firstNames":"Marius","affiliations":["Laboratory of Polymeric and Composite Materials, Materia Nova Materials R\u0026D Center \u0026 UMons Innovation Center, 7000 Mons, Belgium"],"ids":["SC:7003394298""OR:0000-0002-7773-4737"]}; Paint, Yoann; Murariu, Olteaet al.
PLA; Vicat softening temperature; anhydrite II; biocomposites; calcium sulfate; crystallization; injection molding and extrusion; melt–mixing; mineral filler; natural gypsum; poly(lactic acid); technical applications; thermal and mechanical properties; Biocomposite; Melt mixing; Poly lactide; Chemistry (all); Polymers and Plastics; General Chemistry
Abstract :
[en] The melt-mixing of polylactide (PLA) with micro- and/or nanofillers is a key method used to obtain specific end-use characteristics and improvements of properties. So-called "insoluble" CaSO4 (CS) β-anhydrite II (AII) is a mineral filler recently considered for the industry of polymer composites. First, the study proves that AII made from natural gypsum by a specifically thermal treatment is highly stable compared to other CS forms. Then, PLAs of different isomer purity and molecular weights (for injection molding (IM) and extrusion), have been used to produce "green" composites filled with 20-40 wt.% AII. The composites show good thermal and mechanical properties, accounting for the excellent filler dispersion and stability. The stiffness of composites increases with the amount of filler, whereas their tensile strength is found to be dependent on PLA molecular weights. Interestingly, the impact resistance is improved by adding 20% AII into all investigated PLAs. Due to advanced kinetics of crystallization ascribed to the effects of AII and use of a PLA grade of high L-lactic acid isomer purity, the composites show after IM an impressive degree of crystallinity (DC), i.e., as high as 50%, while their Vicat softening temperature is remarkably increased to 160 °C, which are thermal properties of great interest for applications requiring elevated rigidity and heat resistance.
Research center :
CIRMAP - Centre d'Innovation et de Recherche en Matériaux Polymères
Disciplines :
Materials science & engineering
Author, co-author :
{"lastName":"Murariu", "firstNames":"Marius","affiliations":["Laboratory of Polymeric and Composite Materials, Materia Nova Materials R\u0026D Center \u0026 UMons Innovation Center, 7000 Mons, Belgium"],"ids":["SC:7003394298""OR:0000-0002-7773-4737"]}
Recent Advances in Production of Ecofriendly Polylactide (PLA)-Calcium Sulfate (Anhydrite II) Composites: From the Evidence of Filler Stability to the Effects of PLA Matrix and Filling on Key Properties.
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