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Effect of polymer coating on ammonium nitrate substrate
Author(s) -
Castorina Thomas C.,
Smetana Andrew F.
Publication year - 1974
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.1974.070180508
Subject(s) - materials science , coating , ammonium nitrate , adsorption , chemical engineering , polymer , xylylene , polymerization , polymer chemistry , ammonium , substrate (aquarium) , composite material , chemistry , organic chemistry , oceanography , engineering , geology
Prilled, spheroidized, and granular ammonium nitrates (AN) were coated with poly(chloro‐ p ‐xylylene) (parylene C) by a vapor deposition polymerization technique. Particles of AN with a 0.2% coating remain free flowing after long exposure to ambient conditions. The effectiveness of the coating as a moisture barrier on the three forms of AN was found to be in the order spheroids > prills > granules. Water adsorption isotherms and hygroscopicity determinations indicate that a 0.7% coating hydrophobes the surface of AN by approximately one order of magnitude. The parylene C/AN interface exhibits chemical and physical stability at elevated temperatures.