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Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response

Several composites were prepared based on a polypropylene random copolymer (PPR) and different amounts of date stone flour (DSF). This cellulosic fiber was silanized beforehand in order to reduce its hydrophilicity and improve the interfacial adhesion with the polymer. Other composites were also obt...

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Autores principales: Benarab, Amina, Blázquez-Blázquez, Enrique, Krache, Rachida, Benavente, Rosario, Cerrada, María L., Pérez, Ernesto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8433710/
https://www.ncbi.nlm.nih.gov/pubmed/34503000
http://dx.doi.org/10.3390/polym13172957
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author Benarab, Amina
Blázquez-Blázquez, Enrique
Krache, Rachida
Benavente, Rosario
Cerrada, María L.
Pérez, Ernesto
author_facet Benarab, Amina
Blázquez-Blázquez, Enrique
Krache, Rachida
Benavente, Rosario
Cerrada, María L.
Pérez, Ernesto
author_sort Benarab, Amina
collection PubMed
description Several composites were prepared based on a polypropylene random copolymer (PPR) and different amounts of date stone flour (DSF). This cellulosic fiber was silanized beforehand in order to reduce its hydrophilicity and improve the interfacial adhesion with the polymer. Other composites were also obtained, including a sorbitol derivative as an effective nucleant. Films made from these composites were prepared using two different thermal treatments, involving slow crystallization and rapid cooling from the melt. Scanning electron microscopy was used to evaluate the morphological features and the DSF particle dispersion within the PPR matrix. X-ray diffraction experiments and differential scanning calorimetry tests were employed to assess the crystalline characteristics and for the phase transitions, paying especial attention to the effects of the DSF and nucleating agent on PPR crystallization. An important nucleation ability was found for DSF, and evidently for the sorbitol derivative. The peak crystallization temperature upon cooling was considerably increased by the incorporation of either the nucleant or DSF. Additionally, a much higher proportion of orthorhombic crystals developed in relation to the monoclinic ones. Moreover, the mechanical responses were estimated from the microhardness experiments and significant improvements were found with increasing DSF contents. All of these findings indicate that the use of silanized DSF is a fairly good approach for the preparation of polymeric eco-composites, taking advantage of the widespread availability of this lignocellulosic material, which is otherwise wasted.
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spelling pubmed-84337102021-09-12 Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response Benarab, Amina Blázquez-Blázquez, Enrique Krache, Rachida Benavente, Rosario Cerrada, María L. Pérez, Ernesto Polymers (Basel) Article Several composites were prepared based on a polypropylene random copolymer (PPR) and different amounts of date stone flour (DSF). This cellulosic fiber was silanized beforehand in order to reduce its hydrophilicity and improve the interfacial adhesion with the polymer. Other composites were also obtained, including a sorbitol derivative as an effective nucleant. Films made from these composites were prepared using two different thermal treatments, involving slow crystallization and rapid cooling from the melt. Scanning electron microscopy was used to evaluate the morphological features and the DSF particle dispersion within the PPR matrix. X-ray diffraction experiments and differential scanning calorimetry tests were employed to assess the crystalline characteristics and for the phase transitions, paying especial attention to the effects of the DSF and nucleating agent on PPR crystallization. An important nucleation ability was found for DSF, and evidently for the sorbitol derivative. The peak crystallization temperature upon cooling was considerably increased by the incorporation of either the nucleant or DSF. Additionally, a much higher proportion of orthorhombic crystals developed in relation to the monoclinic ones. Moreover, the mechanical responses were estimated from the microhardness experiments and significant improvements were found with increasing DSF contents. All of these findings indicate that the use of silanized DSF is a fairly good approach for the preparation of polymeric eco-composites, taking advantage of the widespread availability of this lignocellulosic material, which is otherwise wasted. MDPI 2021-08-31 /pmc/articles/PMC8433710/ /pubmed/34503000 http://dx.doi.org/10.3390/polym13172957 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Benarab, Amina
Blázquez-Blázquez, Enrique
Krache, Rachida
Benavente, Rosario
Cerrada, María L.
Pérez, Ernesto
Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title_full Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title_fullStr Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title_full_unstemmed Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title_short Composites of a Polypropylene Random Copolymer and Date Stone Flour: Crystalline Details and Mechanical Response
title_sort composites of a polypropylene random copolymer and date stone flour: crystalline details and mechanical response
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8433710/
https://www.ncbi.nlm.nih.gov/pubmed/34503000
http://dx.doi.org/10.3390/polym13172957
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