Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation
| Autor: | Rogério Ramos de Sousa Junior, Julia Rocha Gouveia, Amanda Martins Nacas, Lara Basilio Tavares, Nathalie Minako Ito, Erivaldo Nascimento de Moura, Felipe Ariel Gaia, Robson Fernando Pereira, Demetrio Jackson dos Santos |
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| Jazyk: | angličtina |
| Předmět: | |
| Zdroj: | Materials Research |
| Druh dokumentu: | article |
| ISSN: | 1516-1439 1980-5373 |
| DOI: | 10.1590/1980-5373-mr-2018-0123 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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