Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/36976

TitlePreparation of robust polyamide microcapsules by interfacial polycondensation of p-phenylenediamine and sebacoyl chloride and plasticization with oleic acid
Author(s)Rosa, Natacha
Martins, Gabriela V.
Bastos, Margarida M S M
Gois, Joana R.
Coelho, Jorge F. J.
Marques, Juliana Filipa Gouveia
Tavares, C. J.
Magalhães, Fernão D
KeywordsFragility
interfacial polymerization
mechanical stability
microencapsulation
smooth surface
surfactant
Issue date2015
PublisherInforma Healthcare
JournalJournal of microencapsulation
CitationNatacha Rosa, Gabriela V. Martins, Margarida M.S.M. Bastos, Joana R. Gois, Jorge F.J. Coelho, Juliana Marques, Carlos J. Tavares & Fernão D. Magalhães (2015) Preparation of robust polyamide microcapsules by interfacial polycondensation of p-phenylenediamine and sebacoyl chloride and plasticization with oleic acid, Journal of Microencapsulation: Micro and Nano Carriers, 32:4, 349-357, DOI: 10.3109/02652048.2015.1028494
Abstract(s)Microcapsules produced by interfacial polycondensation of p-phenylenediamine (PPD) and sebacoyl chloride (SC) were studied. The products were characterized in terms of morphology, mean diameter and effectiveness of dodecane encapsulation. The use of Tween 20 as dispersion stabilizer, in comparison with polyvinyl alcohol (PVA), reduced considerably the mean diameter of the microcapsules and originated smoother wall surfaces. When compared to ethylenediamine (EDA), microcapsules produced with PPD monomer were more rigid and brittle, prone to fracture during processing and ineffective retention of the core liquid. The use of diethylenetriamine (DETA) cross-linker in combination with PPD did not decrease capsule fragility. On the other hand, addition of a small fraction of oleic acid to the organic phase remarkably improved wall toughness and lead to successful encapsulation of the core-oil. Oleic acid is believed to act as a plasticizer. Its incorporation in the polymeric wall was demonstrated by FTIR and (1)H-NMR.
TypeArticle
URIhttp://hdl.handle.net/1822/36976
DOI10.3109/02652048.2015.1028494
ISSN0265-2048
1464-5246
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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