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Application of cellulose sulfoacetate obtained from sugarcane bagasse as an additive in mortars
Nascimento, Barbara
Rodrigues Filho, Guimes
Frigoni, Elaine Selaro
Soares, Heline Mendes
Meireles, Carla da Silva
Cerqueira, Daniel Alves
Monteiro Valente, Artur Jose
Carvalho, Rui de Albuquerque
Nascimento de Assuncao, Rosana Maria
de Castro Motta, Leila Aparecida
Journal of Applied Polymer Science, 124(1), pp 510-517, 2012-4-5
Summary
In this study, cellulose sulfoacetate (CSA) was produced with cellulose extracted from sugarcane bagasse with sulfuric acid as a catalyst under homogenous conditions so that the derivative could be applied as an additive for mortar of Portland (Cimento Portland de alta resistencia inicial, CPV-ARI) cement. The IR spectra showed that only precipitate C presented the characteristic band of sulfate groups (807 cm(-1)) and was, therefore, the sulfoacetylated derivative. CSA presented a degree of acetylation of 2.70 and a degree of sulfonation of 0.063, and the presence of sulfate groups in the derivative displaced the position of C(6) to a lower field in the C-13-NMR spectrum and influenced reduced viscosity as a function of concentration. The evaluation of CSA as an additive showed that for a polymer/cement ratio of 0.6%, an increase of 13.80% was achieved consistently, and an increase of 21.05% in the potential tensile of adhesion strength was also achieved.
Keywords
additives; biodegradable; water-soluble polymers
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