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Release rate characteristics of microencapsulated 2,3,5,6‐tetrachloro‐4‐methylsulfonylpyridine
Author(s) -
Noren G. K.,
Korpi G. K.,
England G. J.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070241205
Subject(s) - extraction (chemistry) , urea formaldehyde , in situ polymerization , polymerization , formaldehyde , methanol , solubility , aqueous medium , aqueous solution , chemical engineering , chemistry , materials science , porosity , nuclear chemistry , polymer chemistry , chromatography , polymer , organic chemistry , adhesive , layer (electronics) , engineering
The rate at which 2,3,5,6‐tetrachloro‐4‐methylsulfonylpyridine (TMP) is released from a microcapsular controlled delivery device was determined using aqueous methanol as an extraction medium. The microcapsules were prepared by in situ polymerization of a urea–formaldehyde resin. Release rate studies demonstrated that the amount of 2,3,5,6‐tetrachloro‐4‐methylsulfonylpyridine released is proportional to t −1/2 and the solubility of 2,3,5,6‐tetrachloro‐4‐methylsulfonylpyridine in the extraction medium. These relationships are characteristic of a porous, monolithic delivery system.