Controlling the release of active iron and manganese ions from styrene-butadiene rubber-binding matrix containing chloride salts of them

• Published in: Journal of applied polymer science 2009-07, Vol.113 (2), p.811-817
• Main Authors: Helaly, F.M, Nashar, D. El, Khalaf, A.I
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Applied sciences; Biological and medical sciences; Chlorides; controlled release; Exact sciences and technology; Forms of application and semi-finished materials; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Iron; Iron chlorides; Manganese; Mathematical analysis; Media; micronutrients; Miscellaneous; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Polymer industry, paints, wood; release of manganese and iron; Rubber; Soil-plant relationships. Soil fertility. Fertilization. Amendments; styrene-butadiene rubber (SBR); Technology of polymers; Water temperature
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.29766

Slow release technique is a new trial to control the release of manganese and iron ions from styrene-butadiene rubber (SBR) formulations containing manganese and iron chlorides. The SBR compounded was mixed and vulcanized according to the general equipment of rubber. Discs of surface area about 16 cm² for each one were prepared and subjected to leaching rate test in aqueous media. The release rate of manganese and iron ions was prolonged for up to 5 months. The profile behavior of the release for the two investigated ions are similar, the difference between them is in the amount of release dispersed ions in water. The concentration of active ingredients; manganese and iron chlorides; and environmental water temperature were affected on the amount of release rate. According to the higher solubility of manganese chloride on aqueous media, the release of manganese was greater than iron. The diffusions coefficient of the released manganese and iron ions in aqueous media were 7.9 x 10⁻⁷ and 4.9 x 10⁻⁷, respectively, according to Higuch's equation.