Thermal degradation of vinyl acetate-methacrylic acid copolymer and the homopolymers. II. Thermal analysis studies

1995 ◽  
Vol 48 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Ian C. McNeill ◽  
Shafique Ahmed ◽  
Livia Memetea
Keyword(s):  
Thermal Analysis ◽  
Thermal Degradation ◽  
Vinyl Acetate ◽  
Methacrylic Acid ◽  
Acid Copolymer

Alkali-Thickening Characteristics of Vinyl Acetate and Vinyl Ester Versatic Acid Copolymer Latex Using Carboxylic Monomers

2011 ◽  
Vol 391-392 ◽  
pp. 917-921
Author(s):  
Hai Ying Liu ◽  
Ji You Gu ◽  
Huan Zhao
Keyword(s):  
Water Absorption ◽  
Vinyl Acetate ◽  
Methacrylic Acid ◽  
Vinyl Ester ◽  
Carboxyl Groups ◽  
Pseudoplastic Fluid ◽  
Acid Copolymer ◽  
State Of Water ◽  
Lower Temperature ◽  
Seed Emulsion Polymerization

VAc/Veova10/MAA copolymer latex containing carboxyl groups was synthesized by the semi-continuous seed emulsion polymerization with vinyl acetate (VAc), vinyl ester of versatic acid (Veova10) and methacrylic acid (MAA). Alkali-thickening characteristics of VAc/Veova10/MAA copolymer latex containing carboxyl groups, adjusted from pH 5.5 to 6.4, 8.9, 9.8 with NaOH aq., were investigated by DSC. The results showed that the viscosities of VAc/Veova10/MAA copolymer latex were increased with the inceasing of pH, The frozen temperature peaks were observed to increase with the increasing of pH, the thawed temperature peaks were shifted to lower temperature, and the state of water in latexes were different. The partial morphologies of latexes were irregular and latexes were pseudoplastic fluid. And water absorption of films were increased with the increasing of pH in latexes and dry and wet shear strengths were also decreased.

Physicochemical characterization and mechanisms of release of theophylline from melt-extruded dosage forms based on a methacrylic acid copolymer

2005 ◽  
Vol 301 (1-2) ◽  
pp. 112-120 ◽  
Author(s):  
Christopher R. Young ◽  
Caroline Dietzsch ◽  
Matteo Cerea ◽  
Thomas Farrell ◽  
Kurt A. Fegely ◽  
...  
Keyword(s):  
Methacrylic Acid ◽  
Physicochemical Characterization ◽  
Dosage Forms ◽  
Acid Copolymer

Thermal degradation of ethylene (vinyl acetate)

1996 ◽  
Vol 47 (1) ◽  
pp. 247-258 ◽  
Author(s):  
M. L. Marín ◽  
A. Jiménez ◽  
J. López ◽  
J. Vilaplana
Keyword(s):  
Thermal Degradation ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate

scholarly journals A thermal degradation study of Y and La methanesulfonates

2006 ◽  
Vol 71 (8-9) ◽  
pp. 905-915
Author(s):  
Moura de ◽  
Jivaldo Matos ◽  
Farias de
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Differential Thermal Analysis ◽  
Thermal Degradation ◽  
Degradation Process ◽  
Oxide Formation ◽  
Scanning Calorimetry ◽  
Degradation Study ◽  
Thermogravimetric Data ◽  
Thermal Degradation Process

The synthesis, characterization and thermal degradation of yttrium and lanthanum methanesulfonates is reported. The prepared salts were characterized by elemental analysis and infrared spectroscopy. The thermal degradation study was performed using thermogravimetry (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC).Using the thermogravimetric data, a kinetic study of the dehydration ofY and Lamethanesulfonates was performed employing the Coats-Redfern and Zsak?methods. It was verified that under heating, yttrium and lanthanum methanesulfonates undergo three main processes: dehydration, thermal degradation and oxide formation. Furthermore, depending on the nature of the atmosphere, i.e., inert or oxidant, the thermal degradation process could be endothermic (N2) or exothermic (air).

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