Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/67110
Type: Artigo de periódico
Title: Fractionation of cellulose acetate for the investigation of molecular weight influences on the morphology of membranes
Author: Loske, S
Goncalves, MDC
Wolf, BA
Abstract: Cellulose acetate (CA) with an apparent weight average molar mass, M-w*, of 150 kg/mol was fractionated with respect to M by means of the mixed solvent methyl acetate (MeAc)/2-propanol (2-POH) applying a new method that uses spinning nozzles to promote the rapid attainment of phase equilibria. Two of the fractions obtained in this manner were employed to prepare membranes from solutions in methyl acetate with 2-propanol as coagulating agent. Electron n-dcrographs demonstrate that the molar mass of CA influences the morphology of the membranes markedly under otherwise identical conditions. For M-w* = 128 kg/mol, one obtains considerably denser structures than for M-w* = 263 kg/mol; furthermore, the pores are considerably less interconnected in the former than in the latter case. The efficiency of the fractionation process and the reasons for the differences in membrane structure are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
Subject: membrane preparation and structure
continuous polymer fractionation
cellulose acetate
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0376-7388(02)00549-5
Date Issue: 2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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