Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior

Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior

Abstract This study evaluated the influence of cellulose nanocrystals (CNC) content on the properties of epoxy nanocomposites. The CNC were obtained from microcrystalline cellulose by acid hydrolysis. 4.0, 5.5 and 7.0% of untreated CNC were incorporated into epoxy resin. Sonication was used to disperse the CNC in the resin. The thermal stability, the glass transition temperature and the degree of conversion were reduced as observed by Thermogravimetry and Differential Scanning Calorimetry, respectively. The tensile and bending modulus showed no significant improvement and the impact resistance showed a slight reduction due to the non-uniform dispersion of the CNCs, as observed by Transmission Electron Microscopy. Analysis of Scanning Electron Microscopy showed a change of the fracture mechanism of the epoxy resin: the CNCs increased the elastic modulus by reinforcement, but accelerated the fracture by acting as defects. The Halpin-Tsai model was applied to predict the elastic modulus of the epoxy/CNC system.

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Main Authors: Nascimento,Nayra Reis do, Pinheiro,Ivanei Ferreira, Alves,Guilherme Fioravanti, Mei,Lucia Helena Innocentini, Macedo Neto,José Costa de, Morales,Ana Rita
Format: Digital revista
Language:English
Published: Associação Brasileira de Polímeros 2021
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282021000300409
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spelling oai:scielo:S0104-142820210003004092022-01-04Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behaviorNascimento,Nayra Reis doPinheiro,Ivanei FerreiraAlves,Guilherme FioravantiMei,Lucia Helena InnocentiniMacedo Neto,José Costa deMorales,Ana Rita cellulose nanocrystals nanocomposites epoxy resin Abstract This study evaluated the influence of cellulose nanocrystals (CNC) content on the properties of epoxy nanocomposites. The CNC were obtained from microcrystalline cellulose by acid hydrolysis. 4.0, 5.5 and 7.0% of untreated CNC were incorporated into epoxy resin. Sonication was used to disperse the CNC in the resin. The thermal stability, the glass transition temperature and the degree of conversion were reduced as observed by Thermogravimetry and Differential Scanning Calorimetry, respectively. The tensile and bending modulus showed no significant improvement and the impact resistance showed a slight reduction due to the non-uniform dispersion of the CNCs, as observed by Transmission Electron Microscopy. Analysis of Scanning Electron Microscopy showed a change of the fracture mechanism of the epoxy resin: the CNCs increased the elastic modulus by reinforcement, but accelerated the fracture by acting as defects. The Halpin-Tsai model was applied to predict the elastic modulus of the epoxy/CNC system.info:eu-repo/semantics/openAccessAssociação Brasileira de PolímerosPolímeros v.31 n.3 20212021-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282021000300409en10.1590/0104-1428.20210057
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Nascimento,Nayra Reis do
Pinheiro,Ivanei Ferreira
Alves,Guilherme Fioravanti
Mei,Lucia Helena Innocentini
Macedo Neto,José Costa de
Morales,Ana Rita
spellingShingle Nascimento,Nayra Reis do
Pinheiro,Ivanei Ferreira
Alves,Guilherme Fioravanti
Mei,Lucia Helena Innocentini
Macedo Neto,José Costa de
Morales,Ana Rita
Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
author_facet Nascimento,Nayra Reis do
Pinheiro,Ivanei Ferreira
Alves,Guilherme Fioravanti
Mei,Lucia Helena Innocentini
Macedo Neto,José Costa de
Morales,Ana Rita
author_sort Nascimento,Nayra Reis do
title Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
title_short Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
title_full Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
title_fullStr Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
title_full_unstemmed Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
title_sort role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior
description Abstract This study evaluated the influence of cellulose nanocrystals (CNC) content on the properties of epoxy nanocomposites. The CNC were obtained from microcrystalline cellulose by acid hydrolysis. 4.0, 5.5 and 7.0% of untreated CNC were incorporated into epoxy resin. Sonication was used to disperse the CNC in the resin. The thermal stability, the glass transition temperature and the degree of conversion were reduced as observed by Thermogravimetry and Differential Scanning Calorimetry, respectively. The tensile and bending modulus showed no significant improvement and the impact resistance showed a slight reduction due to the non-uniform dispersion of the CNCs, as observed by Transmission Electron Microscopy. Analysis of Scanning Electron Microscopy showed a change of the fracture mechanism of the epoxy resin: the CNCs increased the elastic modulus by reinforcement, but accelerated the fracture by acting as defects. The Halpin-Tsai model was applied to predict the elastic modulus of the epoxy/CNC system.
publisher Associação Brasileira de Polímeros
publishDate 2021
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282021000300409
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