Preparation and characterization of poly(urethane-urea) microcapsules containing limonene. Kinetic analysis

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Silva, M (Autor) Outra; Isabel M. Martins (Autor) FEUP; Barreiro, F (Autor) Outra; Madalena M. Dias (Autor) FEUP; Alírio Rodrigues (Autor) FEUP

Revista

Título: International Journal of Polymer Analysis and Characterization

Vol. 22

Páginas: 709-724

ISSN: 1023-666X

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00N-CMW

DOI: 10.1080/1023666x.2017.1369253

Abstract (EN): The synthesis of poly(urethane-urea) shells (PUU) using poly(ethylene glycols) of different molecular weights and methylene-bis(4-cyclohexylisocyanate) was performed for the microencapsulation of limonene, using a step-growth polymerization process. The obtained microcapsules were structurally characterized by dynamic light scattering, optical microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The results showed that the core-shell microcapsules had spherical shape, a mean diameter in between 10 and 20 mu m, and characteristic urethane-urea bonds. Furthermore, the molecular weight of polyol influences the entrapment efficiency, which ranged from 38 to 55%. The release data were analyzed by applying the Korsmeyer-Peppas model.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16