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Sulfonation reactions were carried out in 1,2dichloroethane at 50¡ãC  using acetyl sulfate as the sulfonating agent.n The calcium, sodium, and zinc salts were prepared by titrating the sulfonic acid derivatives with the appropriate metal acetate. Subsequently, the polymers were precipitated with methanol (boiling water for the acid derivative),washed with methanol, and vacuum dried¡£
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