DIFFERENTIAL SCANNING CALORIMETRY OF AQUEOUS POLYMER SOLUTIONS AND GELS

Authors
  1. Ahad, E.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
The melting phenomena of aqueous polymer solutions and gels have been investigated by differential scanning calorimetry. The polymers used were synthetic polyacrylamide and polyvinylalcohol samples as well as guar and xanthan gums. By using an empirical relation, the energy measured from the area under the melting peak yielded heats of mixing and sorption when fitted by an association factor computed from the data. This factor (independent of the concentration) is a measure of the water fraction associated with the polymer and has a definite and characteristic value for a given polymer in water. When a crosslinking agent was added to the water-polymer system, the association factor varied with the polymer concentration; the macromolecular chains thus become less accessible to penetrating water. If a branched gel was obtained owing to the formation of chemical crosslinks, a hump appeared on the melting peak.
Report Number
TN-2095/73 —
Date of publication
15 Nov 1973
Number of Pages
22
DSTKIM No
74-03220
CANDIS No
22866
Format(s):
Hardcopy;Originator's fiche received by DSIS

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