How to maintain the morphology of styrene-divinylbenzene copolymer beads during the sulfonation reaction

Author

Ana Jaqueline BarretoAlcino Palermode AguiaraMônica Regina Marques Palermode AguiarbLuiz Claudiode Santa Mariab

a

Departamento de Engenharia Química, Instituto Militar de Engenharia, Praça General Tibúrcio, 80, Rio de Janeiro/RJ, CEP 22290-270, Brazil

b

Instituto de Química, Universidade do Estado do Rio de Janeiro Rua São Francisco Xavier, 524, Rio de Janeiro/RJ, CEP 20559-900, Brazil

Received 24 May 2004, Revised 2 December 2004, Accepted 9 December 2004, Available online 25 December 2004.

Abstract

This work aims to describe the use of acetyl sulfate as sulfonating reagent of microporous beads based on styrene (STY) and divinylbenzene (DVB) which were prepared by aqueous suspension copolymerization. The copolymer was chemically modified by two different sulfonating agents, namely sulfuric acid and acetyl sulfate which is prepared “in situ” by mixing acetic anhydride and sulfuric acid. The morphologic features of resin beads were analyzed by optical microscopy (OM) and by scanning electron microscopy (SEM). The sulfonic group incorporation into the copolymer network was verified by infrared spectroscopy (FTIR) and quantified by using a standardized NaOH solution. The bead morphology maintenance depends on the sulfonating agent and reaction conditions.

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