Síntese de poliestireno sulfonado para aplicações no tratamento de água produzido a partir de copos e bandejas descartadas de poliestireno

Abstract

Recebido em 16/11/07; aceito em 30/6/08; publicado na web em 10/11/08 SYNTHESIS OF POLY(STYRENE SULFONATE) FROM DISCARDED POLYSTYRENE CUPS AND EXPANDED TRAYS FOR APPLICATION ON WATER TREATMENT. In the present paper, the use of poly(styrene sulfonate) (PSS), produced from discarded polystyrene materials through heterogeneous and homogeneous processes, was investigated. The use of PSS for water treatment, using a kaolin suspension as wastewater model, reduced water turbidity for all the employed materials when compared to the blank analysis, without PSS. The most efficient polyelectrolyte was PSS cups obtained by homogeneous route. The same behavior was observed for real system. The homogeneous PSS cups showed a balance between a moderate molecular weight and high anionic character that improved flocks formation and water removal turbidity.

Solubility behavior of amphiphilic sulfonated copolymers based on styrene–stearyl methacrylate and styrene–stearyl cinnamate

“…The synthesis of polyelectrolytes containing in their structure strong acid groups has not been extensively reported, and this could be related to the difficulty in synthesizing them due to the large differences between (1) the hydrophilicity and hydrophobicity of the segments and (2) the monomer solubility . Chemical modification of the polymer chain is an alternative to obtain copolymers containing strong acid groups, for example, by inserting sulfonic groups following homogeneous or heterogeneous methods . The suitability of each method is related to the desired sulfonation degree and to the reaction yield.…”

Production, Characterization and Use of Sulfonated Polystyrene and Polysulfone Membranes as Catalysts in the Esterification Reaction of Oleic Acid

“…É observada uma banda intensa em aproximadamente 3500 cm -1 corresponde ao grupamento O-H devido ao caráter ácido do poliestireno sulfonado. As bandas em 1097, 1178 e 560 cm -1 , são evidências da sulfonação, pois são atribuídas aos estiramentos do grupo -SO 2 -Oe SO 3 H. 13,34 A banda em 1635 cm -1 corresponde aos carbonos insaturados C=C de aromáticos. As bandas de estiramento C-H de aromáticos ocorrem próximos de 3000 cm -1 .…”

“…), proteção para equipamentos eletrônicos e espumas para embalagens e proteção. 13 Também pode ser modificado quimicamente produzindo um novo material, como a sulfonação, originando o poliestireno sulfonado (PSS).…”

Mortar modified with sulfonated polystyrene produced from waste plastic cups

“…Recycling of materials has become a worthy field of research, development and application of resources, since there is an environmental and economic interest in the removal of discarded materials from the environment, avoiding the consumption of non-renewable raw material. In this sense, the search for viable routes for the use of materials, either in their original chemical form or by their chemical transformation, has been studied aiming to find a market for their application [1]. Recycling is seen as an alternative in trying to remove from the environment the waste produced daily by our society.…”

“…Polystyrene can be recycled for the production of new materials. In a previous work, the PS obtained from discarded cups and food trays was used for the production of ion-exchange membranes [5], in the water treatment as an auxiliary agent of coagulation, flocculation and flotation for water and wastewater treatment [1,18], and as an admixture to concrete with excellent results, such as increased workability and water reduction, being classified as a superplasticizer admixture [19][20][21]. The objective of this study was to examine the application of sulfonated polystyrene, obtained from discarded plastic cups, as an admixture in mortars.…”