Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation
Low surface energy and poor adhesion are well-known characteristics of polypropylene (PP). Surface treatments such as plasma, corona, and laser are usually applied to overcome these limitations. However, current studies highlight the incorporation of hydrophilic or amphiphilic polymers into hydrophobic low-surface-energy polymers as an alternative for increasing surface energy and thus improving adhesion. Lignin could be a promising amphiphilic polymer for use in increasing surface energy. In this work, PP/kraft lignin composites were obtained by incorporating up to 5 wt% of kraft lignin (KL) into a PP matrix. Corona treatment was applied to pristine PP and composites surfaces. Contact angle measurements and peeling tests were carried out to investigate the effects of KL incorporation and corona treatment on the surface energy and the mechanical strength of adhesion. Differential scanning calorimetry (DSC) was used to evaluate the PP’s crystallinity index and recrystallization temperature and to dismiss their effects on the surface energy changes. Scanning electron microscopy (SEM) was applied to investigate the lignin dispersion. The results show that KL incorporation has potential as a method to improve the surface energy of PP, improve its poor adhesion, and enhance the effects of corona treatment.
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ABM, ABC, ABPol
2019
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oai:scielo:S1516-143920190002002332019-02-21Improvement of Polypropylene Adhesion by Kraft Lignin IncorporationSousa Junior,Rogério Ramos deGouveia,Julia RochaNacas,Amanda MartinsTavares,Lara BasilioIto,Nathalie MinakoMoura,Erivaldo Nascimento deGaia,Felipe ArielPereira,Robson FernandoSantos,Demetrio Jackson dos Adhesion lignin surface energy contact angle Low surface energy and poor adhesion are well-known characteristics of polypropylene (PP). Surface treatments such as plasma, corona, and laser are usually applied to overcome these limitations. However, current studies highlight the incorporation of hydrophilic or amphiphilic polymers into hydrophobic low-surface-energy polymers as an alternative for increasing surface energy and thus improving adhesion. Lignin could be a promising amphiphilic polymer for use in increasing surface energy. In this work, PP/kraft lignin composites were obtained by incorporating up to 5 wt% of kraft lignin (KL) into a PP matrix. Corona treatment was applied to pristine PP and composites surfaces. Contact angle measurements and peeling tests were carried out to investigate the effects of KL incorporation and corona treatment on the surface energy and the mechanical strength of adhesion. Differential scanning calorimetry (DSC) was used to evaluate the PP’s crystallinity index and recrystallization temperature and to dismiss their effects on the surface energy changes. Scanning electron microscopy (SEM) was applied to investigate the lignin dispersion. The results show that KL incorporation has potential as a method to improve the surface energy of PP, improve its poor adhesion, and enhance the effects of corona treatment.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.22 n.2 20192019-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000200233en10.1590/1980-5373-mr-2018-0123 |
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Sousa Junior,Rogério Ramos de Gouveia,Julia Rocha Nacas,Amanda Martins Tavares,Lara Basilio Ito,Nathalie Minako Moura,Erivaldo Nascimento de Gaia,Felipe Ariel Pereira,Robson Fernando Santos,Demetrio Jackson dos |
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Sousa Junior,Rogério Ramos de Gouveia,Julia Rocha Nacas,Amanda Martins Tavares,Lara Basilio Ito,Nathalie Minako Moura,Erivaldo Nascimento de Gaia,Felipe Ariel Pereira,Robson Fernando Santos,Demetrio Jackson dos Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
author_facet |
Sousa Junior,Rogério Ramos de Gouveia,Julia Rocha Nacas,Amanda Martins Tavares,Lara Basilio Ito,Nathalie Minako Moura,Erivaldo Nascimento de Gaia,Felipe Ariel Pereira,Robson Fernando Santos,Demetrio Jackson dos |
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Sousa Junior,Rogério Ramos de |
title |
Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
title_short |
Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
title_full |
Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
title_fullStr |
Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
title_full_unstemmed |
Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation |
title_sort |
improvement of polypropylene adhesion by kraft lignin incorporation |
description |
Low surface energy and poor adhesion are well-known characteristics of polypropylene (PP). Surface treatments such as plasma, corona, and laser are usually applied to overcome these limitations. However, current studies highlight the incorporation of hydrophilic or amphiphilic polymers into hydrophobic low-surface-energy polymers as an alternative for increasing surface energy and thus improving adhesion. Lignin could be a promising amphiphilic polymer for use in increasing surface energy. In this work, PP/kraft lignin composites were obtained by incorporating up to 5 wt% of kraft lignin (KL) into a PP matrix. Corona treatment was applied to pristine PP and composites surfaces. Contact angle measurements and peeling tests were carried out to investigate the effects of KL incorporation and corona treatment on the surface energy and the mechanical strength of adhesion. Differential scanning calorimetry (DSC) was used to evaluate the PP’s crystallinity index and recrystallization temperature and to dismiss their effects on the surface energy changes. Scanning electron microscopy (SEM) was applied to investigate the lignin dispersion. The results show that KL incorporation has potential as a method to improve the surface energy of PP, improve its poor adhesion, and enhance the effects of corona treatment. |
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ABM, ABC, ABPol |
publishDate |
2019 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000200233 |
work_keys_str_mv |
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