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Polymer Chemistry Vol - 6 Issue - 6

Polymer Chemistry Vol - 6 Issue - 5

Polymer Chemistry Vol -5

Polymer Chemistry Vol -4

Polymer Chemistry Vol -3

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Efficient microencapsulation of a liquid isocyanate with in situ shell functionalization

Content Provider	Royal Society of Chemistry (RSC)
Author	Berg, Otto den Nguyen, Le-Thu T. Teixeira, Roberto F. A. Hillewaere, Xander K. D. Prez, Filip E. Du
Copyright Year	2015
Abstract	We report on a one-pot, facile approach for the encapsulation of the liquid hexamethylene diisocyanate isocyanurate trimer in polyurea microcapsules formed via the oil-in-water interfacial reaction of an uretonimine-modified diphenyl methane diisocyanate trimer with triaminopyrimidine, with in situ shell functionalization/modification using different types of hydrophobic agents. Remarkably, the use of hexamethylenedisilazane resulted in microcapsules of about 70 μm in diameter, with a smooth outer surface and a high isocyanate core content up to 85 wt% as determined by quantitative online FT-IR analysis of the extracted core. On the other hand, the use of an alkylamine, fluorinated aromatic amine and/or perfluoride amine provided microcapsules of approximately 100 to 150 μm in diameter containing around 65–75 wt% of the isocyanate core content, with the outer shell surface bearing pendant hydrophobic groups as confirmed by SEM-EDX. The effects of the functionalizing compound on the microcapsule properties such as shell morphology, size distribution and stability were assessed. After one day immersion in water, the initial isocyanate content of the microcapsules with a non-functionalized shell dropped rapidly from 49 to 15 wt%, whereas the ones with the modified shell structure maintained their core content, suggesting a significantly enhanced microcapsule stability.
Starting Page	1159
Ending Page	1170
Page Count	12
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	6
Issue Number	7
Journal	Polymer Chemistry
DOI	10.1039/c4py01448k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cyanuric acid Methane Protein trimer Thin-shell structure Amine Hexamethylene diisocyanate Isocyanate Micrometre Polyurea Hydrophobe Fourier-transform infrared spectroscopy Aromatic amine
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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