Premium
The influence of polymorphic form on oxygen and water vapor transmission through lipid films
Author(s) -
Kester J. J.,
Fennema O.
Publication year - 1989
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/bf02670101
Subject(s) - water vapor , oxygen , flux (metallurgy) , diffusion , materials science , moisture , sorption , chemical engineering , chemistry , thermodynamics , organic chemistry , composite material , physics , adsorption , engineering
Fully‐hydrogenated soybean and rapeseed oil was blended 2:1, layered on a filter paper support, adjusted to the desired polymorphic form and tested for resistance to transmission to oxygen and water vapor. Resistance to oxygen transport decreased upon conversion from α to the β′ form and then increased substantially upon conversion to the β polymorph. This was attributed to the greater solid‐state density of the β form, which likely affects resistance to gas flux by lowering the oxygen diffusion constant through the film. Resistance to water vapor transmission also decreased following the α to β′ transition and then increased somewhat upon conversion to the β form. However, resistance of the β form did not exceed that of the α form at any of the temperatures tested. Moisture sorption characteristics of the various polymorphic forms apparently caused relative resistance values for water vapor flux to differ, somewhat from those for oxygen flux.