title: 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 DSQ=0.55 and DSS=0.33 which contained partially unsubstituted hydroxyls. The molar masses (M(n)) of the film's soluble parts were increasing in order X<SX<SXQ<QX<XS<QXS. In all films there were some insoluble particles present as determined by the amount of recovered masses by SEC-MALS. The materials were further characterized by AFM, XRD, TG/DTG/DTA, NMR and mechanical testing. QXS and SXQ could form mechanically more stable films than XS specimens.
authors.affiliation: Institute of Chemistry, Slovak Academy of Sciences, 845 38 Bratislava, Slovakia. Electronic address: chemsimk@savba.sk.
authors.forename: Ivan
authors.initials: I
authors.lastname: Šimkovic
authors.forename: Adam
authors.initials: A
authors.lastname: Tracz
authors.forename: Ivan
authors.initials: I
authors.lastname: Kelnar
authors.forename: Iveta
authors.initials: I
authors.lastname: Uhliariková
authors.forename: Raniero
authors.initials: R
authors.lastname: Mendichi
mesh_terms: D029964:Fagus / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D008970:Molecular Weight; D010426:Pentosan Sulfuric Polyester / Q000737:chemistry*
chemical_list: D010426:Pentosan Sulfuric Polyester
keywords: Composites; Films; Mechanical testing; Thermal properties; Xylan