Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/38370
Título: | Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
Autor(es): | Santos, R. M. Vilaverde, C. Cunha, E. Paiva, M. C. Covas, J. A. |
Palavras-chave: | Melt mixing Polymer Graphite nanoplate Dispersion Re-agglomeration |
Data: | 2016 |
Editora: | Royal Society of Chemistry |
Revista: | Soft Matter |
Citação: | Santos, R. M., Vilaverde, C., Cunha, E., Paiva, M. C., & Covas, J. A. (2016). Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates. Soft Matter, 12(1), 77-86. doi: 10.1039/c5sm01366f |
Resumo(s): | A one-step melt-mixing method is proposed to study dispersion and re-agglomeration phenomena of the as-received and functionalized graphite nanoplates in polypropylene melts. Graphite nanoplates were chemically modified via 1,3-dipolar cycloaddition of an azomethine ylide and then grafted with polypropylene-graft-maleic anhydride. The effect of surface functionalization on the dispersion kinetics, nanoparticle re-agglomeration and interface bonding with the polymer is investigated. Nanocomposites with 2 or 10 wt% of as-received and functionalized graphite nanoplates were prepared in a small-scale prototype mixer coupled to a capillary rheometer. Samples were collected along the flow axis and characterized by optical microscopy, scanning electron microscopy and electrical conductivity measurements. The as-received graphite nanoplates tend to re-agglomerate upon stress relaxation of the polymer melt. The covalent attachment of a polymer to the nanoparticle surface enhances the stability of dispersion, delaying the re-agglomeration. Surface modification also improves interfacial interactions and the resulting composites presented improved electrical conductivity. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/38370 |
DOI: | 10.1039/c5sm01366f |
ISSN: | 1744-683X |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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c5sm01366f.pdf | 4,8 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons