Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA

Detalhes bibliográficos
Autor(a) principal: Ramos,Renata Brandão Brito
Data de Publicação: 2018
Outros Autores: Souza,Patrícia Moraes Sinohara, Morales,Ana Rita
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000600229
Resumo: The effect of clay hydrophobicity on the cold crystallization and rheological properties of nanocomposites of poly(D,L-lactic acid) (PDLLA) was investigated. Crystallization was evaluated by DSC for isothermal and non-isothermal conditions. The clay modified with a hydrophilic surfactant acts as a nucleating agent, while the clay modified with a hydrophobic surfactant acts in an opposite way. The Avrami and Ozawa parameters showed a three-dimensional spherulitic growth for all samples and the activation energy increased for the hydrophobic clay and decrease for the hydrophilic one. The equilibrium melting point for the PDLLA was found at 161ºC, being slightly altered as function of the surfactant polarity. The rheological behavior was investigated in terms of Isothermal Flow-Induced Crystallization and Structural Recovery. The hydrophobic clay showed to reduce the mobility of chains and retard the chain relaxation, which is attributed to the formation of a network, while the hydrophilic clay increased the chain mobility.
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spelling Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLAPDLLAnanocompositesorganoclayscrystallizationThe effect of clay hydrophobicity on the cold crystallization and rheological properties of nanocomposites of poly(D,L-lactic acid) (PDLLA) was investigated. Crystallization was evaluated by DSC for isothermal and non-isothermal conditions. The clay modified with a hydrophilic surfactant acts as a nucleating agent, while the clay modified with a hydrophobic surfactant acts in an opposite way. The Avrami and Ozawa parameters showed a three-dimensional spherulitic growth for all samples and the activation energy increased for the hydrophobic clay and decrease for the hydrophilic one. The equilibrium melting point for the PDLLA was found at 161ºC, being slightly altered as function of the surfactant polarity. The rheological behavior was investigated in terms of Isothermal Flow-Induced Crystallization and Structural Recovery. The hydrophobic clay showed to reduce the mobility of chains and retard the chain relaxation, which is attributed to the formation of a network, while the hydrophilic clay increased the chain mobility.ABM, ABC, ABPol2018-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000600229Materials Research v.21 n.6 2018reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2018-0059info:eu-repo/semantics/openAccessRamos,Renata Brandão BritoSouza,Patrícia Moraes SinoharaMorales,Ana Ritaeng2018-10-09T00:00:00Zoai:scielo:S1516-14392018000600229Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2018-10-09T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
title Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
spellingShingle Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
Ramos,Renata Brandão Brito
PDLLA
nanocomposites
organoclays
crystallization
title_short Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
title_full Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
title_fullStr Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
title_full_unstemmed Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
title_sort Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
author Ramos,Renata Brandão Brito
author_facet Ramos,Renata Brandão Brito
Souza,Patrícia Moraes Sinohara
Morales,Ana Rita
author_role author
author2 Souza,Patrícia Moraes Sinohara
Morales,Ana Rita
author2_role author
author
dc.contributor.author.fl_str_mv Ramos,Renata Brandão Brito
Souza,Patrícia Moraes Sinohara
Morales,Ana Rita
dc.subject.por.fl_str_mv PDLLA
nanocomposites
organoclays
crystallization
topic PDLLA
nanocomposites
organoclays
crystallization
description The effect of clay hydrophobicity on the cold crystallization and rheological properties of nanocomposites of poly(D,L-lactic acid) (PDLLA) was investigated. Crystallization was evaluated by DSC for isothermal and non-isothermal conditions. The clay modified with a hydrophilic surfactant acts as a nucleating agent, while the clay modified with a hydrophobic surfactant acts in an opposite way. The Avrami and Ozawa parameters showed a three-dimensional spherulitic growth for all samples and the activation energy increased for the hydrophobic clay and decrease for the hydrophilic one. The equilibrium melting point for the PDLLA was found at 161ºC, being slightly altered as function of the surfactant polarity. The rheological behavior was investigated in terms of Isothermal Flow-Induced Crystallization and Structural Recovery. The hydrophobic clay showed to reduce the mobility of chains and retard the chain relaxation, which is attributed to the formation of a network, while the hydrophilic clay increased the chain mobility.
publishDate 2018
dc.date.none.fl_str_mv 2018-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000600229
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000600229
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1980-5373-mr-2018-0059
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.21 n.6 2018
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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