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Polymer Bulletin
Erschienen in: Polymer Bulletin 9/2013

01.09.2013 | Original Paper

Non-isothermal cold crystallization behavior and kinetics of poly(l-lactide): effect of l-lactide dimer

verfasst von: F. Ravari, A. Mashak, M. Nekoomanesh, H. Mobedi

Erschienen in: Polymer Bulletin | Ausgabe 9/2013

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Abstract

The effects of l-lactide dimer as additives on the crystallization behavior of poly(l-lactide) (PLLA) films were studied. Hence, neat PLLA films and PLLA containing l-lactide (5 % w/w) (PLLA/La) were prepared in dichloromethane at room temperature via solution casting. The non-isothermal cold crystallization of PLLA films were studied using differential scanning calorimetry at various heating rates including 2.5, 5, 7.5, 10 and 15 °C/min. However, the X C% was increased for PLLA/La films in comparison with neat PLLA films. The crystallization kinetics was then analyzed by the Avrami, Jeziorny, Ozawa and Mo kinetic models. It is found that all the kinetic models were established to describe the experimental data fairly well except the Ozawa model. The values of t 1/2, Z C and F(T) indicated that the crystallization rate increased with increase in heating rates for PLLA and PLLA/La films. However, l-lactide dimer incorporated in PLLA films accelerates the crystallization process of PLLA at the high heating rate. The nucleation constant (K g) and the surface free energy (σ e) based on Lauritzen–Hoffman theory indicated that these parameters for PLLA/La films is lower than neat PLLA.
Vorheriger Artikel Shear and extensional rheometry of PA6 reinforced with polyacrylic nanoparticles
Nächster Artikel Synthesis of genistein-containing star-shaped homo- and copolyesters by the ring-opening polymerization

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Metadaten
Titel
Non-isothermal cold crystallization behavior and kinetics of poly(l-lactide): effect of l-lactide dimer
verfasst von
F. Ravari
A. Mashak
M. Nekoomanesh
H. Mobedi
Publikationsdatum
01.09.2013
Verlag
Springer Berlin Heidelberg
Erschienen in
Polymer Bulletin / Ausgabe 9/2013
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-013-0972-6

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