Thermal properties of copolymerization products of methyl methacrylate with methacrylamide

Radical copolymerization of methyl methacrylate and methacrylamide was studied. For polymer films prepared from acetic acid solutions, the heat resistance and thermomechanical behavior were evaluated, and adhesion to silicate glass was determined.     

Adhesion of methyl methacrylate copolymers to silicate glass

Adhesion of methyl methacrylate copolymers with acrylic acid, methacrylic acid, and methacrylamide to silicate glass was studied. The copolymers of methyl methacrylate with acrylic and methacrylic acids, compared to poly(methyl methacrylate), are characterized by higher adhesion strength of polymer fi lm-silicate glass joints.     

Heat resistance and thermooxidative stability of copolymers of methyl methacrylate with methacrylic acid and methacrylamide

Effect of the composition of copolymers of methyl methacrylate with methacrylic acid and methacrylamide on their heat resistance and thermooxidative stability was studied.     

Preparation and thermal degradation of methyl methacrylate-methacrylic acid copolymers

Copolymers of methyl methacrylate with methacrylic acid, with the mole fraction of methacrylic acid units from 0.21 to 0.73, were prepared by radical copolymerization in the bulk. The influence of the composition of the copolymers on the features of their thermal degradation was examined by combined thermal analysis involving differential scanning calorimetry and thermogravimetry.     

Polyelectrolyte Hydrogels Based on Radiation-Modified Polyacrylamide and Products of Its Alkali Hydrolysis

The effect of molecular mass on the formation of polyelectrolyte hydrogels made from polyacrylamide (PAAm) and products of its alkali hydrolysis and on their water sorption capacity was studied. It was found that the efficiency of crosslinking of both the initial polymer and its hydrolyzates noticeably decreased on passing from high-molecular-mass to low-molecular-mass PAAm. Hydrogels prepared from high-molecular-mass PAAm and its hydrolyzates exhibited a greater limiting water uptake as compared with hydrogels made from low-molecular-mass PAAm and its hydrolyzates. A change in the degree of conversion of amide to acrylate groups from 35–41 to 47–54% had a slight effect on the maximum water uptake.     

Radiation polymerization of 2-acrylamido-2-methylpropanesulfonic acid in aqueous solutions

The dependence of the yield of polymer and its molecular mass on the absorbed dose of γ-irradiation of a 0.8 M 2-acrylamido-2-methylpropanesulfonic acid aqueous solution was determined, as well as the gel fraction of the polymer produced. The feasibility of obtaining a crosslinked polymer via radiation polymerization of 2-acrylamido-2-methylpropanesulfonic acid in the presence of N,N′-methylenebisacrylamide admixtures was shown. It was found that the maximal degree of crosslinking is reached at a dose on the order of 20 kGy and the maximal water uptake (1150 g/g) is achieved at a dose of 1.25 kGy.     

Water-Soluble Polymers of Acrylamide as Labeling Adhesives

The adhesive and rheological properties of high- and low-molecular-weight polyacrylamides and the products of their partial hydrolysis were studied. The suitability of the hydrolyzates of high-molecular-weight polyacrylamide as labeling adhesives in the glass-paper system was elucidated.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 5, 2005, pp. 856–859.Original Russian Text Copyright © 2005 by Krul’, Ivanova, Yakimtsova, Grinyuk.     

Thermomechanical properties and heat resistance of copolymers of methyl methacrylate with acrylic acid

Copolymers with a mole fraction of acrylate units of 0.20 to 0.69 were prepared by radical copolymerization of methyl methacrylate with acrylic acid. The heat resistance and thermomechanical properties of copolymer films formed from dimethylformamide solution were evaluated, and the possibilities of improving these characteristics were demonstrated.