Non-isothermal cold crystallization kinetics of cork-polymer biocomposites based on polylactic acid for fused filament fabrication
authors da Silva, SPM; Silva, MA; Oliveira, JM
nationality International
journal JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
author keywords Cork; Biocomposites; Thermoplastics; Differential scanning calorimetry (DSC); Crystallization kinetics
keywords PHASE-TRANSITION KINETICS; GROWTH SITE IMPINGEMENT; POLY(LACTIC ACID); MELTING BEHAVIOR; COMPOSITES; NANOCOMPOSITES; POLYPROPYLENE; PARAMETERS; MORPHOLOGY; FILLER
abstract Cork-polymer composites (CPC) based on polylactic acid (PLA) matrix were prepared for the development of filaments for fused filament fabrication. The non-isothermal cold crystallization behaviours of PLA and CPC were investigated by differential scanning calorimetry. Cold crystallization kinetic behaviours of PLA and CPC with 15 mass/% of cork powder residues at different heating rates (1.25, 2.5, 5 and 7.5 K min(-1)) were studied. Results showed that cold crystallization temperature (T-cc) of PLA matrix decreased with the addition of cork. Crystallization kinetic behaviour was studied by Avrami and Tobin models. It was shown that cork powder surface acts as a nucleating agent during non-isothermal cold crystallization, by accelerating the crystallization rate and, therefore, by reducing the half-time crystallization (t(1/2)) values. Polarized optical microscopy and X-ray diffraction were used to evaluate the crystalline structure of PLA and CPC. Kissinger and Friedman methods were employed to determine the crystallization activation energy (E-c).
publisher SPRINGER
issn 1388-6150
isbn 1588-2926
year published 2021
volume 146
issue 4
beginning page 1667
ending page 1678
digital object identifier (doi) 10.1007/s10973-020-10147-6
web of science category 12
subject category Thermodynamics; Chemistry, Analytical; Chemistry, Physical
unique article identifier WOS:000560932500001
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