1978
DOI: 10.1002/app.1978.070220617
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Melting of hydrogels containing ammonium nitrate

Abstract: SynopsisThe fusion of hydrogels containing ammonium nitrate (AN) has been investigated by differential scanning calorimetry (DSC). The polymers used were guar and xanthan gums as well as synthetic polyacrylamide polymers. Water in hydrogels could be classified into three types labeled as ordinary water (hump on the melting peak), intermediate water (broad component of the peak), and bound nonfreezing water (without any phase transition). The temperature of fusion of intermediate water was about 10" to 35OC low… Show more

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Cited by 20 publications
(6 citation statements)
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“…It is well known that the high hydrophilicity of chitosan due to the primary amine group makes chitosan easily soluble in dilute acid solutions to yield a hydrogel in water. 22 The swelling characteristics of chitosan hydrogels are dominated by the nature of the polymer and the state of water. 23,24 In our study, when the Fe 3+ ions bonded to chitosan polymer with a relative high ratio (the molar ratio of chitosan, Cu(II), Fe(III) in chitosan-Cu-Fe complexes are 1 : 1 : 2 and 1 : 0.5 : 1), chitosan complex swelled, which might be due to the changes of the chitosan structures.…”
Section: Preparation Of Chitosan Metal Complexmentioning
confidence: 99%
“…It is well known that the high hydrophilicity of chitosan due to the primary amine group makes chitosan easily soluble in dilute acid solutions to yield a hydrogel in water. 22 The swelling characteristics of chitosan hydrogels are dominated by the nature of the polymer and the state of water. 23,24 In our study, when the Fe 3+ ions bonded to chitosan polymer with a relative high ratio (the molar ratio of chitosan, Cu(II), Fe(III) in chitosan-Cu-Fe complexes are 1 : 1 : 2 and 1 : 0.5 : 1), chitosan complex swelled, which might be due to the changes of the chitosan structures.…”
Section: Preparation Of Chitosan Metal Complexmentioning
confidence: 99%
“…The high molecular fraction G2G1 reveals peak splitting under the above mentioned conditions whereas the ice melting from a freshly prepared solution of this fraction is a ideal as expected ( Figure 4). Such splitting of DSC melting endotherms of freezable water was connected with the existance of different states inside the free freezable water for mucoplysaccharides [20], cellulose acetate membranes [lS, 211 and guar and xanthan hydrogels [22].…”
Section: Non-freezable Water In Maltodextrin Solutions and Gelsmentioning
confidence: 99%
“…Die Wasseraufnahme von Hydrogelen wird auch durch die Taktizitat beeinflufit (119,120). Die Differentialthermo-analyse zeigt, da8 ein Teil des Wassers in gequollenen Hydrogelen nicht gefriert (120)(121)(122)(123)(124) Neben diesem fest gebundenen, nicht gefrierfahigen Wasser gibt es freies Wasser (Tm 0 bis -6" C) und Wasser, das einen Schmelzbereich von -16 bis -40° C zeigt (120,121,125…”
Section: Discussionunclassified