Biodegradable materials from grafting of modified PLA onto starch nanocrystals
PLA was grafted onto starch nanoparticles using a novel synthetic strategy consisting of three reaction steps. The first step was aimed to protect the hydroxyl groups of PLA by benzoylation (PLABz), the second one involved the activation of carboxyl groups using thionyl chloride and the last reactio...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01413910_v97_n10_p2021_Garcia |
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todo:paper_01413910_v97_n10_p2021_Garcia2023-10-03T14:58:35Z Biodegradable materials from grafting of modified PLA onto starch nanocrystals García, N.L. Lamanna, M. D'Accorso, N. Dufresne, A. Aranguren, M. Goyanes, S. Chemically modified starch Nanocomposites Nanocrystals Poly (lactic acid) Benzoyl group Benzoylation Biodegradable material Carboxyl groups Chemically modified Degradation temperatures Grafting onto Hydroxyl groups Molecular mobility Packaging industry Physical mixtures Poly lactic acid Polymer chains Starch nanocrystals Starch nanoparticles Synthetic strategies Thermal behaviors Thionyl chlorides Three reaction steps Blending Chemical modification Chlorine compounds Degradation Lactic acid Nanocomposites Nanocrystals Nanoparticles Starch Grafting (chemical) PLA was grafted onto starch nanoparticles using a novel synthetic strategy consisting of three reaction steps. The first step was aimed to protect the hydroxyl groups of PLA by benzoylation (PLABz), the second one involved the activation of carboxyl groups using thionyl chloride and the last reaction was the grafting of the modified PLA onto the starch nanoparticles (PLASTARCH). The thermal behavior of the composite obtained by this method was very different from that displayed by the physical mixture of PLA and the starch nanoparticles (PLA-NC blend). The benzoylation step that leads to PLABz produces an increase of the molecular mobility, resulting in lower glass transition temperature, Tg, than that of the original PLA; a change that was observed in the DSC thermograms of the samples. On the other hand, the Tg of the PLASTARCH was similar to that of the PLA as a consequence of two opposite effects acting simultaneously: a free volume increase due to the presence of benzoyl groups and a confinement of the polymer chain, originating from the grafting onto NC. The material obtained by chemical modification (PLASTARCH) has a degradation temperature slightly lower than that of PLA, which does not affect its potential use in the packaging industry. © 2012 Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01413910_v97_n10_p2021_Garcia |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chemically modified starch Nanocomposites Nanocrystals Poly (lactic acid) Benzoyl group Benzoylation Biodegradable material Carboxyl groups Chemically modified Degradation temperatures Grafting onto Hydroxyl groups Molecular mobility Packaging industry Physical mixtures Poly lactic acid Polymer chains Starch nanocrystals Starch nanoparticles Synthetic strategies Thermal behaviors Thionyl chlorides Three reaction steps Blending Chemical modification Chlorine compounds Degradation Lactic acid Nanocomposites Nanocrystals Nanoparticles Starch Grafting (chemical) |
| spellingShingle |
Chemically modified starch Nanocomposites Nanocrystals Poly (lactic acid) Benzoyl group Benzoylation Biodegradable material Carboxyl groups Chemically modified Degradation temperatures Grafting onto Hydroxyl groups Molecular mobility Packaging industry Physical mixtures Poly lactic acid Polymer chains Starch nanocrystals Starch nanoparticles Synthetic strategies Thermal behaviors Thionyl chlorides Three reaction steps Blending Chemical modification Chlorine compounds Degradation Lactic acid Nanocomposites Nanocrystals Nanoparticles Starch Grafting (chemical) García, N.L. Lamanna, M. D'Accorso, N. Dufresne, A. Aranguren, M. Goyanes, S. Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| topic_facet |
Chemically modified starch Nanocomposites Nanocrystals Poly (lactic acid) Benzoyl group Benzoylation Biodegradable material Carboxyl groups Chemically modified Degradation temperatures Grafting onto Hydroxyl groups Molecular mobility Packaging industry Physical mixtures Poly lactic acid Polymer chains Starch nanocrystals Starch nanoparticles Synthetic strategies Thermal behaviors Thionyl chlorides Three reaction steps Blending Chemical modification Chlorine compounds Degradation Lactic acid Nanocomposites Nanocrystals Nanoparticles Starch Grafting (chemical) |
| description |
PLA was grafted onto starch nanoparticles using a novel synthetic strategy consisting of three reaction steps. The first step was aimed to protect the hydroxyl groups of PLA by benzoylation (PLABz), the second one involved the activation of carboxyl groups using thionyl chloride and the last reaction was the grafting of the modified PLA onto the starch nanoparticles (PLASTARCH). The thermal behavior of the composite obtained by this method was very different from that displayed by the physical mixture of PLA and the starch nanoparticles (PLA-NC blend). The benzoylation step that leads to PLABz produces an increase of the molecular mobility, resulting in lower glass transition temperature, Tg, than that of the original PLA; a change that was observed in the DSC thermograms of the samples. On the other hand, the Tg of the PLASTARCH was similar to that of the PLA as a consequence of two opposite effects acting simultaneously: a free volume increase due to the presence of benzoyl groups and a confinement of the polymer chain, originating from the grafting onto NC. The material obtained by chemical modification (PLASTARCH) has a degradation temperature slightly lower than that of PLA, which does not affect its potential use in the packaging industry. © 2012 Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
García, N.L. Lamanna, M. D'Accorso, N. Dufresne, A. Aranguren, M. Goyanes, S. |
| author_facet |
García, N.L. Lamanna, M. D'Accorso, N. Dufresne, A. Aranguren, M. Goyanes, S. |
| author_sort |
García, N.L. |
| title |
Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| title_short |
Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| title_full |
Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| title_fullStr |
Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| title_full_unstemmed |
Biodegradable materials from grafting of modified PLA onto starch nanocrystals |
| title_sort |
biodegradable materials from grafting of modified pla onto starch nanocrystals |
| url |
http://hdl.handle.net/20.500.12110/paper_01413910_v97_n10_p2021_Garcia |
| work_keys_str_mv |
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| _version_ |
1807315803274477568 |