Effect of Coagulative Mechanism of Particle Growth on the Structural Heterogeneity of Ethyl Acrylate-Methacrylic Acid Copolymer Latex Particles

1993 ◽  
Vol 58 (10) ◽  
pp. 2451-2457 ◽  
Author(s):  
Jaromír Šňupárek ◽  
Pavel Bradna ◽  
Libuše Mrkvičková ◽  
František Lednický ◽  
Otakar Quadrat
Keyword(s):  
Methacrylic Acid ◽  
Particle Growth ◽  
Structural Heterogeneity ◽  
Ethyl Acrylate ◽  
Heterogeneous Structure ◽  
Small Particles ◽  
Latex Particles ◽  
Acid Copolymer ◽  
Methacrylic Acid Copolymers ◽  
Scanning Electron

Latex particles of ethyl acrylate-methacrylic acid copolymers prepared by semicontinuous emulsion polymerization with a monomer emulsion feed were found to disintegrate into smaller subparticles on alkalization. The phenomenon observed by light scattering and scanning electron microscopy is explained in terms of heterogeneous structure of latex particles which are agglomerates of small particles formed by coagulation during polymerization. The influence of particle size and polymerization route on particle heterogenity is discussed.

Effect of Initial Polymerization Conditions on the Structure of Ethyl Acrylate-Methacrylic Acid Copolymer Latex Particles

1995 ◽  
Vol 60 (10) ◽  
pp. 1756-1764 ◽  
Author(s):  
Jaromír Šňupárek ◽  
Pavel Bradna ◽  
Libuše Mrkvičková ◽  
František Lednický ◽  
Otakar Quadrat
Keyword(s):  
Methacrylic Acid ◽  
Colloidal Stability ◽  
Particle Growth ◽  
Ethyl Acrylate ◽  
Phase Partitioning ◽  
Acid Copolymer ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Alkali Addition ◽  
Polymerization Conditions

Non-seeded semi-continuous emulsion copolymerizations of ethyl acrylate-methacrylic acid (85/15 wt. ratio) were carried out using various emulsifier and initiator concentrations and phase partitioning. The effect of the polymerization conditions on the particle size and morphology was investigated by means of scanning electron microscopy, light scattering and viscometry. Disintegration into smaller particles on alkali addition confirmed coagulative mechanism of the particle growth. This is distinct mainly if the colloidal stability of the polymerizing system is reduced due to lower concentration of the emulsifier and higher concentration of peroxydisulfate initiator which suppress double layer thickness of forming particles.

Structure and flow behavior of crosslinked ethyl acrylate-methacrylic acid copolymer dispersion particles

1998 ◽  
Vol 276 (10) ◽  
pp. 879-886 ◽  
Author(s):  
O. Quadrat ◽  
L. Mrkvic˘ková ◽  
Z. Walterová ◽  
L. Titkova ◽  
P. Bradna ◽  
...  
Keyword(s):  
Methacrylic Acid ◽  
Flow Behavior ◽  
Ethyl Acrylate ◽  
Acid Copolymer

Synthesis of Konjac Glucomannan-Graft-Methacrylic Acid Copolymer

2012 ◽  
Vol 554-556 ◽  
pp. 307-310
Author(s):  
Hui Min Han ◽  
Chi Zhang ◽  
Jing Xu ◽  
Peng Qu ◽  
Ye Zhou ◽  
...  
Keyword(s):  
Free Radical ◽  
Reaction Temperature ◽  
Methacrylic Acid ◽  
Konjac Glucomannan ◽  
Initiator Concentration ◽  
Reaction Conditions ◽  
Radical Initiation ◽  
Acid Copolymer ◽  
Free Radical Initiation ◽  
Methacrylic Acid Copolymers

Konjac glucomannan is a kind of natural polysaccharides with excellent biocompatibility and biodegradable activities. In this paper, a series of Konjac glucomannan-graft-methacrylic acid copolymers were prepared by the free-radical initiation grafting Konjac Glucomannan (KGM) with methacrylic acid(MA). The reaction conditions such as reaction temperature, KGM and MA ratio and initiator concentration, were investigated, and chemistry of KGM and its MA grafted copolymers were characterized using FTIR.

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