CASTRO, M. C. de; TROTA FILHO, J. Determination of SPEEK sulfonation degree by titration. Brazilian Journal of Science, [S. l.], v. 2, n. 9, p. 13–21, 2023. DOI: 10.14295/bjs.v2i9.358. Disponível em: https://periodicos.cerradopub.com.br/bjs/article/view/358. Acesso em: 21 dec. 2024.