Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites

Films of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric...

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Main Authors:	Marta Carsi, Maria J. Sanchis, Clara M. Gómez, Sol Rodriguez, Fernando G. Torres
Format:	Article
Language:	English
Published:	MDPI AG 2019-06-01
Series:	Polymers
Subjects:	carrageenan chitin dielectric relaxation spectroscopy electric modulus fragility
Online Access:	https://www.mdpi.com/2073-4360/11/6/1083

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record_format	Article
spelling	doaj-7560ab0766a2438ab446dac0e985f0ea2020-11-25T01:13:36ZengMDPI AGPolymers2073-43602019-06-01116108310.3390/polym11061083polym11061083Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based NanocompositesMarta Carsi0Maria J. Sanchis1Clara M. Gómez2Sol Rodriguez3Fernando G. Torres4Department of Applied Thermodynamics, Instituto de Automática e Informática Industrial, Universitat Politècnica de Valencia, 46022 Valencia, SpainDepartment of Applied Thermodynamics, Instituto de Tecnología Eléctrica, Universitat Politècnica de València, 46022 Valencia, SpainDepartament de Química Física, Institut de Ciència dels Materials, Universitat de València, 46010 Valencia, SpainDepartment of Mechanical Engineering, Pontificia Universidad Católica del Peru, Lima 32, PeruDepartment of Mechanical Engineering, Pontificia Universidad Católica del Peru, Lima 32, PeruFilms of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric relaxation spectroscopy. The analysis of the CHW effect on the molecular mobility at the glass transition, <i>T<sub>g</sub></i>, indicates that non-attractive intermolecular interactions between KCg and CHW occur. The fragility index increased upon CHW incorporation, due to a reduction in the polymer chains mobility produced by the CHW confinement of the KCg network. The apparent activation energy associated with the relaxation dynamics of the chains at <i>T<sub>g</sub></i> slightly increased with the CHW content. The filler nature effect, CHW or montmorillonite (MMT), on the dynamic mobility of the composites was analyzed by comparing the dynamic behavior of both carrageenan-based composites (KCg/<i>x</i>CHW, KCg/<i>x</i>MMT).https://www.mdpi.com/2073-4360/11/6/1083carrageenanchitindielectric relaxation spectroscopyelectric modulusfragility
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Marta Carsi Maria J. Sanchis Clara M. Gómez Sol Rodriguez Fernando G. Torres
spellingShingle	Marta Carsi Maria J. Sanchis Clara M. Gómez Sol Rodriguez Fernando G. Torres Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites Polymers carrageenan chitin dielectric relaxation spectroscopy electric modulus fragility
author_facet	Marta Carsi Maria J. Sanchis Clara M. Gómez Sol Rodriguez Fernando G. Torres
author_sort	Marta Carsi
title	Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
title_short	Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
title_full	Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
title_fullStr	Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
title_full_unstemmed	Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
title_sort	effect of chitin whiskers on the molecular dynamics of carrageenan-based nanocomposites
publisher	MDPI AG
series	Polymers
issn	2073-4360
publishDate	2019-06-01
description	Films of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric relaxation spectroscopy. The analysis of the CHW effect on the molecular mobility at the glass transition, <i>T<sub>g</sub></i>, indicates that non-attractive intermolecular interactions between KCg and CHW occur. The fragility index increased upon CHW incorporation, due to a reduction in the polymer chains mobility produced by the CHW confinement of the KCg network. The apparent activation energy associated with the relaxation dynamics of the chains at <i>T<sub>g</sub></i> slightly increased with the CHW content. The filler nature effect, CHW or montmorillonite (MMT), on the dynamic mobility of the composites was analyzed by comparing the dynamic behavior of both carrageenan-based composites (KCg/<i>x</i>CHW, KCg/<i>x</i>MMT).
topic	carrageenan chitin dielectric relaxation spectroscopy electric modulus fragility
url	https://www.mdpi.com/2073-4360/11/6/1083
work_keys_str_mv	AT martacarsi effectofchitinwhiskersonthemoleculardynamicsofcarrageenanbasednanocomposites AT mariajsanchis effectofchitinwhiskersonthemoleculardynamicsofcarrageenanbasednanocomposites AT claramgomez effectofchitinwhiskersonthemoleculardynamicsofcarrageenanbasednanocomposites AT solrodriguez effectofchitinwhiskersonthemoleculardynamicsofcarrageenanbasednanocomposites AT fernandogtorres effectofchitinwhiskersonthemoleculardynamicsofcarrageenanbasednanocomposites
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Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites

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