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Light scattering properties of acacia catechuic acid. Effects of urea and temperature
Author(s) -
Chakravorty J. N.
Publication year - 1971
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.1971.070150401
Subject(s) - urea , aqueous solution , solvent , dissociation (chemistry) , chemistry , molecule , root mean square , ethanol , inorganic chemistry , organic chemistry , electrical engineering , engineering
Association of acacia catechuic acid (ACA) molecules was established in ethanol–water medium 2 . This association was further tested in pure aqueous medium as well as by using urea in increasing amounts in aqueous solutions. The 5 M urea depressed the molecular weight to 2.82 × 10 6 , as against 5.04 × 10 6 in aqueous solution of NaCl or KCl. This reduction has been explained as due either to rupture of the molecule itself or dissociation of molecules which normally remain associated in water. The diminution of root‐mean‐square end‐to‐end distance in urea from 323 mμ in water 3 to 290 mμ has also been attributed to the disaggregation of the associated molecules. To test this point further, the effect of increasing the temperature was next studied. The molecular weight was observed to be lower at higher temperature (actual value at 47°C was nearly half the original value at 28°C). This considerable reduction positively points to a dissociation of the molecule which was first suspected in our study with urea. The root‐mean‐square end‐to‐end distance also diminished to a certain extent, but not so much as the molecular weight. This has been explained as due to the stretching of the molecule when the solvent behaves as a better solvent at higher temperature.