Isothermal kinetics of (E)-4-(4-metoxyphenyl)-4-oxo-2-butenoic acid release from a poly(acrylic acid-co-methacrylic acid) hydrogel

2007 ◽  
Vol 107 (5) ◽  
pp. 2768-2775 ◽  
Author(s):  
Borivoj Adnadjevic ◽  
Jelena Jovanovic ◽  
Ivana Krkljus
Keyword(s):  
Acrylic Acid ◽  
Methacrylic Acid ◽  
Isothermal Kinetics ◽  
Butenoic Acid ◽  
Acid Release ◽  
Kinetics Of ◽  
Poly Acrylic Acid

scholarly journals Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution

2007 ◽  
Vol 72 (11) ◽  
pp. 1139-1153 ◽  
Author(s):  
Aleksandar Kostic ◽  
Borivoj Adnadjevic ◽  
Aleksandar Popovic ◽  
Jelena Jovanovic
Keyword(s):  
Acrylic Acid ◽  
Physiological Solution ◽  
Kinetics Model ◽  
Isothermal Kinetics ◽  
Swelling Kinetics ◽  
Distilled Water ◽  
Equilibrium Degree ◽  
Swelling Rate ◽  
Kinetics Of ◽  
Poly Acrylic Acid

The isothermal kinetics curves of the swelling of a poly(acrylic acid) hydrogel in distilled water and physiological solution at temperatures ranging from 20 to 40 ?C were determined. The possibility of applying both the Fick?s kinetics model and kinetics model of the first order chemical reaction to the swelling kinetics of the PAA hydrogel in distilled water and physiological solution were examined. It was found that the possibilities of applying these models were limited. The new model of the kinetics of swelling in distilled water and physiological solution was established. The kinetic parameters (Ea, ln A) for the swelling in distilled water and physiological solution were determined. The decrease of the equilibrium degree of swelling and the saturation swelling rate of the swelling of the PAA hydrogel in physiological solution compared to swelling in distilled water could be explained by the decreased differences in the ionic osmotic pressures between the hydrogel and the swelling medium. The increase of the initial swelling rate in the physiological solution might be caused by an increased density of charges at the network and by an increased affinity of the network towards the water molecules. The increase of the activation energy of the swelling of the PAA hydrogel in the physiological solution is a consequence of its additional "ionic crosslinking".

scholarly journals The Effect of Methacrylic Acid and Maleic Acid on the Isothermal Kinetics of Acrylic Acid Crosslinking Co-polymerization under Conventional and Microwave Heating

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Jelena Dragoslav Jovanovic ◽  
Borivoj Adnadjevic
Keyword(s):  
Acrylic Acid ◽  
Kinetic Parameters ◽  
Microwave Heating ◽  
Methacrylic Acid ◽  
Maleic Acid ◽  
Kinetics Model ◽  
Conventional Heating ◽  
Isothermal Kinetics ◽  
Synthesis Process ◽  
Kinetics Of

The kinetics of free-radical crosslinking co-polymerization (FRCCP) of acrylic acid (AA) with both methacrylic acid (MA) (PAMA hydrogel ) and maleic acid (MAL) (PAMAL hydrogel) was investigated under the conditions of isothermal conventional heating (CH) and under the conditions of microwave heating (MWH) with controlled cooling.   The kinetics curves of FRCCP of PAMA and PAMAL hydrogels under the conditions of CH are described with the kinetics model of second order chemical reaction, whereas the kinetics curves under the conditions of CH are described with the kinetics model of Polany-Winger.  It is proved that MWH leads to the changes in the rate of  FRCCP and to the changes in the values of the kinetic parameters (activation energy (Ea) and pre-exponential factor (lnA).  It was found the existence of relationship between the values of the kinetic parameters calculated for MWH and CH for PAMA and PAMAL hydrogel synthesis process, which is well-known as compensation effect. The effect of MWH on the kinetics of FRCCP for PAMA and PAMAL hydrogel formation were explained by applying the model of activation by selective energy transfer (SET). The changes in kinetics model, rate of FRCCP and kinetics parameters, caused with the MWH can found wide application in designing novel technologies for obtaining polymers and for synthesis of polymers with  novel physico-chemical properties.  The suggested mechanism of activation for polymerisation under the conditions of MWH also enables development of novel reaction systems and technologies for polymers productions. 

Association of Octyl-Modified Poly(acrylic acid) onto Unilamellar Vesicles of Lipids and Kinetics of Vesicle Disruption

Langmuir ◽  
2005 ◽  
Vol 21 (3) ◽  
pp. 853-862 ◽  
Author(s):  
Florent Vial ◽  
Souad Rabhi ◽  
Christophe Tribet
Keyword(s):  
Acrylic Acid ◽  
Unilamellar Vesicles ◽  
Kinetics Of ◽  
Poly Acrylic Acid

Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel

2011 ◽  
Vol 512 (1-2) ◽  
pp. 157-162 ◽  
Author(s):  
Borivoj Adnadjevic ◽  
Gvozden Tasic ◽  
Jelena Jovanovic
Keyword(s):  
Acrylic Acid ◽  
Methacrylic Acid ◽  
Poly Acrylic Acid
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