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A Study of the Slow Release of Urea from Microcapsules with TDI as the Wall‐Sealing Treatment
Author(s) -
Wu Jen Chin,
Lin Yih Tsung
Publication year - 1985
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198500074
Subject(s) - chemistry , toluene diisocyanate , polyurea , urea , biuret test , polyurethane , polymer chemistry , chemical engineering , organic chemistry , engineering
Abstract The release of urea from ethylcellulose coated microcapsules was efficiently reduced by post‐treatment with toluene‐2,4‐diisocyanate (TDI) in n ‐hexane. Our results show that TDI can be used as a sealant which modifies the shell characteristics of the ethylcellulose film. The modification is rather complicated in that it probably includes cross‐linking between ethylcellulose and TDI, a reaction between urea and TDI, and biuret or polyurea formation from TDI absorbed on the microcapsules surface with moisture. The influence of post‐treated conditions on the release of urea from ethylcellulose shell was studied.