Quaternized and sulfated xylan derivative films

Abstract Xylan quaternized sulfate films were prepared from beech xylan (X) and compared with fully sulfated xylan films (XS). When quaternized xylan (QX) was prepared in the first step ( DS Q  = 0.55), than by sulfation of QX in the second step the fully substituted ampholytic derivative (QXS; DS Q  = 0.33; DS S  = 1.67) could be obtained. By sulfation in first step, xylan sulphate (SX, DS S  = 0.70) was obtained and by subsequent quaternization, SXQ film with DS Q  = 0.55 and DS S  = 0.33 which contained partially unsubstituted hydroxyls. The molar masses ( M n ) of the film's soluble parts were increasing in order X