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Crystallization, structural relaxation and thermal degradation in Poly(L-lactide)/cellulose nanocrystal renewable nanocomposites.
Carbohydr Polym. 2015 Jun 05; 123:256-65.CP

Abstract

In this work, crystallization, structural relaxation and thermal degradation kinetics of neat Poly(L-lactide) (PLLA) and its nanocomposites with cellulose nanocrystals (CNC) and CNC-grafted-PLLA (CNC-g-PLLA) have been studied. Although crystallinity degree of nanocomposites remains similar to that of neat homopolymer, results reveal an increase on the crystallization rate by 1.7-5 times boosted by CNC, which act as nucleating agents during the crystallization process. In addition, structural relaxation kinetics of PLLA chains has been drastically reduced by 53% and 27% with the addition of neat and grafted CNC, respectively. The thermal degradation activation energy (E) has been determined from thermogravimetric analysis in the light of Kissinger's and Ozawa-Flynn-Wall theoretical models. Results reveal a reduction on the thermal stability when in presence of CNC-g-PLLA, while raw CNC slightly increases the thermal stability of PLLA. Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy results confirm that the presence of residual catalyst in CNC-g-PLLA plays a pivotal role in the thermal degradation behavior of nanocomposites.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Lizundia E
Macromolecular Chemistry Research Group (LABQUIMAC), Dept. of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Spain. Electronic address: erlantz.liizundia@ehu.es.
Vilas JL
Basque Center for Materials, Applications and Nanostructures (BCMaterials), Parque Tecnológico de Bizkaia, Ed. 500, Derio 48160, Spain. Electronic address: luismanuel.leon@ehu.es.
León LM
Macromolecular Chemistry Research Group (LABQUIMAC), Dept. of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Spain; Basque Center for Materials, Applications and Nanostructures (BCMaterials), Parque Tecnológico de Bizkaia, Ed. 500, Derio 48160, Spain. Electronic address: joseluis.vilas@bcmaterials.net.

MeSH

Calorimetry, Differential ScanningCelluloseCrystallizationNanocompositesNanoparticlesPolyestersSpectrometry, X-Ray EmissionSpectroscopy, Fourier Transform InfraredThermogravimetry

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25843857

Citation

Lizundia, E, et al. "Crystallization, Structural Relaxation and Thermal Degradation in Poly(L-lactide)/cellulose Nanocrystal Renewable Nanocomposites." Carbohydrate Polymers, vol. 123, 2015, pp. 256-65.
Lizundia E, Vilas JL, León LM. Crystallization, structural relaxation and thermal degradation in Poly(L-lactide)/cellulose nanocrystal renewable nanocomposites. Carbohydr Polym. 2015;123:256-65.
Lizundia, E., Vilas, J. L., & León, L. M. (2015). Crystallization, structural relaxation and thermal degradation in Poly(L-lactide)/cellulose nanocrystal renewable nanocomposites. Carbohydrate Polymers, 123, 256-65. https://doi.org/10.1016/j.carbpol.2015.01.054
Lizundia E, Vilas JL, León LM. Crystallization, Structural Relaxation and Thermal Degradation in Poly(L-lactide)/cellulose Nanocrystal Renewable Nanocomposites. Carbohydr Polym. 2015 Jun 5;123:256-65. PubMed PMID: 25843857.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Crystallization, structural relaxation and thermal degradation in Poly(L-lactide)/cellulose nanocrystal renewable nanocomposites. AU - Lizundia,E, AU - Vilas,J L, AU - León,L M, Y1 - 2015/02/03/ PY - 2014/10/07/received PY - 2015/01/12/revised PY - 2015/01/15/accepted PY - 2015/4/7/entrez PY - 2015/4/7/pubmed PY - 2015/12/29/medline KW - Acetone (PubChem CID: 180) KW - Cellulose (PubChem CID: 14055602) KW - Cellulose nanocrystals (CNC) KW - Chloroform (PubChem CID: 6212) KW - Methanol (PubChem CID: 887) KW - Polylactide KW - Renewable nanocomposites KW - Sodium hydroxide (PubChem CID: 14798) KW - Stannous octanoate (PubChem CID: 159632) KW - Sulfuric acid (PubChem CID: 1118) KW - Toluene (PubChem CID: 1140) KW - l-Lactide (PubChem CID: 7272) SP - 256 EP - 65 JF - Carbohydrate polymers JO - Carbohydr Polym VL - 123 N2 - In this work, crystallization, structural relaxation and thermal degradation kinetics of neat Poly(L-lactide) (PLLA) and its nanocomposites with cellulose nanocrystals (CNC) and CNC-grafted-PLLA (CNC-g-PLLA) have been studied. Although crystallinity degree of nanocomposites remains similar to that of neat homopolymer, results reveal an increase on the crystallization rate by 1.7-5 times boosted by CNC, which act as nucleating agents during the crystallization process. In addition, structural relaxation kinetics of PLLA chains has been drastically reduced by 53% and 27% with the addition of neat and grafted CNC, respectively. The thermal degradation activation energy (E) has been determined from thermogravimetric analysis in the light of Kissinger's and Ozawa-Flynn-Wall theoretical models. Results reveal a reduction on the thermal stability when in presence of CNC-g-PLLA, while raw CNC slightly increases the thermal stability of PLLA. Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy results confirm that the presence of residual catalyst in CNC-g-PLLA plays a pivotal role in the thermal degradation behavior of nanocomposites. SN - 1879-1344 UR - https://www.unboundmedicine.com/medline/citation/25843857/Crystallization_structural_relaxation_and_thermal_degradation_in_Poly_L_lactide_/cellulose_nanocrystal_renewable_nanocomposites_ DB - PRIME DP - Unbound Medicine ER -