Document Type : Review Article
Authors
1
Chemistry Department, Faculty of Science, Suez University, P. O. 43512, Suez, Egypt E-mail: mefa6@sci.suezuni.edu.eg
2
Department of Chemistry, Faculty of Science, Suez University, Suez, Egypt
3
Chemistry Department, Faculty of Science, Suez University, P. O. 43512, Suez, Egypt
4
Atomic Energy Authority, National Centre for Research and Radiation Technology, P.O. 29, Cairo, Egypt
Abstract
Numerous experiments have been conducted on the emulsion additional polymerization of vinyl acetate (VAc) copolymers, such as replacing polyvinyl alcohol with renewable materials such as hydroxyethyl cellulose (HEC), starch or natural gum as protective colloids or adding renewable materials to the emulsion as additives or fillers during or before the polymerization. These experiments synthesized polyvinyl acetate (PVAc) copolymers from vinyl acetate monomer (VAM) as raw material and potassium or ammonium persulfate as inorganic thermal initiators in aqueous media containing various protective colloids to improve the properties of the formed polyvinyl acetate (PVAc) emulsions. Physically dispersed titanium dioxide as cross-linking agent in the polymer hydrogels were prepared by a one-step emulsion free radical polymerization mechanism using acrylic acid (AA) as comonomer, Arabic gum (AG) as protective colloid and iron ions (Fe3+) as crosslinking agent. In these experiments, the polymerization process was tested by varying the amount of protective colloid, crosslinking agent or dispersant. The polymers were tested for properties such as morphology, stability, tensile strength and hardness, and some applications of the obtained polymers were tested to check their performance.
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