2.1. Materials
Cellulose acetate, CA (39.8% acetyl content having an average Mw=30kDa), was obtained from Sigma–Aldrich Chemical Co. and used without further purification. Two dyes used were namely, CI reactive black 5 (bis-sulphatoethylsulphone) (Mw = 991.82 g/ mol) and CI reactive red 195 (Aminochlorotriazine-sulphatoethyl sulphone) (Mw = 1136.32 g/mol), supplied by the Sumitomo Chemical Co., Ltd., Japan; the corresponding dye structures are shown in Scheme 1. Sodium carbonate and sodium sulphate used were of Analar grade.
2.1. MaterialsCellulose acetate, CA (39.8% acetyl content having an average Mw=30kDa), was obtained from Sigma–Aldrich Chemical Co. and used without further purification. Two dyes used were namely, CI reactive black 5 (bis-sulphatoethylsulphone) (Mw = 991.82 g/ mol) and CI reactive red 195 (Aminochlorotriazine-sulphatoethyl sulphone) (Mw = 1136.32 g/mol), supplied by the Sumitomo Chemical Co., Ltd., Japan; the corresponding dye structures are shown in Scheme 1. Sodium carbonate and sodium sulphate used were of Analar grade.
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