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Fractionation of heat‐bodied linseed oil with urea and acetone
Author(s) -
Mehta T. N.,
Sharma S. A.
Publication year - 1956
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02638350
Subject(s) - iodine value , iodine , saponification value , linseed oil , chemistry , urea , fractionation , acetone , saponification , organic chemistry , acid value , polymerization , polymer chemistry , drop (telecommunication) , polymer , biochemistry , telecommunications , computer science
Summary During heat‐bodying of linseed oil at 300°C. the drop in iodine value is high in the initial stages, without a corresponding increase in molecular weight. These changes are due partly to conjugation and partly to intradimerization and cyclization. However the amounts of conjugation (5 to 6%) and intradimerization (3 to 7%) are insufficient to explain the large drop in iodine value. Cyclization of linolenic acid takes place to the extent of 8 to 17% at the earlier stages of polymerization and hence is the principal cause of the large drop in iodine values. This cyclized product of linolenic acid was isolated by urea and characterized by determinations of saponification value, iodine value, and mean molecular weight.