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

• Type: Article in International Scientific Journal
• Date: 2017

Authors

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

Journal

Title: International Journal of Polymer Analysis and Characterization

Vol. 22

Pages: 709-724

ISSN: 1023-666X

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 2 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16