The melting of poly ( l -lactic acid)

Abstract

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Thermal diffusivity and secondary crystallisation kinetics in poly(lactic acid)

“…The secondary crystallisation process was found to obey an Arrhenius dependence on temperature: a plot of ln (k s ) against 1/Tc was linear and gave an activation energy of kJ/mol. This value compares well with other reported values of the activation energy for the secondary process; activation energies of 40 kJ/mol [34] and kJ/mol [35] for PCL and 25 kJ/mol [36] have been reported for polycaprolactone and polylactic acid (PLA 2002D, the same grade selected for use in this work). It is worth noting that these activation energies were determined over temperature ranges that were clearly in the 'hot-crystallisation' regions, and in the case of PCL, close to the melting point.…”

Insertion‐Crystallization‐Induced Low‐Temperature Annealing Peaks in Melt‐Crystallized Poly(l‐Lactic Acid)

“…Worth noting, melt‐crystallization at 140 °C, with the crystallization temperature directly approached on cooling the quiescent melt, is much slower, with a crystallization half‐time well above 10 3 s. [ 8,75 ] The slow and linear increase of the crystallization enthalpy with log time on crystallization longer than 500 s is assumed being related to crystal stabilization. [ 16,17,76–82 ]…”

Development and characterization of groundnut shell‐derived biocarbon‐reinforced polylactic acid composite filaments for FDM

“…where ΔH m represents the melting enthalpy of the composite material, ΔH c represents the crystallization enthalpy of the composite material and ΔH o is the enthalpy of fusion when PLA was 100% crystallized which is equal to 93.6 J/g. 35…”

“…The glass transition ( T g ), cold crystallization ( T cc ) temperature, melting enthalpy (Δ H m ), and crystallization enthalpy (Δ H c ) were analyzed using TRIOS software. The crystallinity percentage of the neat PLA and PLA/GNSC composites was calculated by applying the equation: where Δ H m represents the melting enthalpy of the composite material, Δ H c represents the crystallization enthalpy of the composite material and Δ H o is the enthalpy of fusion when PLA was 100% crystallized which is equal to 93.6 J/g 35 …”