Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/25161
Type: Artigo de periódico
Title: Synthesis in pilot plant scale and physical properties of sulfonated polystyrene
Author: Martins, Cristiane R.
Ruggeri, Giacommo
De Paoli, Marco-A.
Abstract: The homogenous sulfonation of polystyrene was developed in a pilot plant scale producing polymers with different sulfonation degrees (18 to 22 mole % of sulfonated styrene units). The reaction yield depends chiefly on the concentration ratio of acetyl sulfate and polystyrene. The morphological and thermal properties of the sulfonated polystyrene obtained by homogeneous sulfonation were studied by means of scanning electron microscopy, differential scanning calorimetry and thermogravimetry. The glass transition temperature of sulfonated polystyrene increases in relation to pure polystyrene and DCp was evaluated in order to confirm the strong interactions among the ~SO3H groups.
A sulfonação homogênea do poliestireno foi desenvolvida em escala pré-piloto produzindo polímeros com diferentes graus de sulfonação (18 a 22 mol % de unidades estirênicas sulfonadas). O rendimento da reação depende principalmente da razão entre a concentração de sulfato de acetila e de poliestireno. As propriedades morfológicas e térmicas dos poliestirenos sulfonados, obtidas pela sulfonação homogênea, foram estudadas por microscopia eletrônica de varredura, calorimetria diferencial de varredura e termogravimetria. A temperatura de transição vítrea do poliestireno sulfonado aumenta em relação ao poliestireno puro e a DCp foi calculada a fim de confirmar as fortes interações com os grupos ~SO3H.
Subject: sulfonation reaction
physical and thermal properties
polystyrene
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0103-50532003000500015
Address: http://dx.doi.org/10.1590/S0103-50532003000500015
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532003000500015
Date Issue: 1-Oct-2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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