Carboxymethylated-, hydroxypropylsulfonated- and quaternized xylan derivative films
Document Type
Article
Publication Date
9-22-2014
Abstract
Under alkaline/water conditions carboxymethyl, 2-hydroxypropylsulfonate and trimethylammonium-2-hydroxypropyl groups were introduced into xylan in one step with the goal to prepare film specimens. The materials were characterized by NMR, SEC-MALS, TG/DTG/DTA, AFM and mechanical testing. The properties of triple, double and mono-substituted materials were compared. The numerical molar masses of the specimens were from 12.3 to 17.6 kg/mol with Mw/Mn from 1.27 to 1.34. The elastic modulus values are decreasing in order: xylan (X; 7354 MPa)>carboxymethyl xylan (CX; 6090MPa)>2-hydroxypropylsulfonate xylan (SX; 6000 MPa)>carboxymethyl/2-hydroxypropylsulfonate xylan (CSX; 4490 MPa)>quaternized xylan (QX; 3600 MPa)>carboxymethyl/quaternary/2-hydroxypropylsulfonate xylan (CQSX; 3380 MPa)>carboxymethyl/quaternary xylan (CQX; 2805 MPa). The onset temperatures of SX (214°C), CQSX (212°C), QSX (211°C) and CQX (207°C) were higher than for X (205°C). The roughness values of the film surfaces (3.634-18.667 nm) are higher on top than on the bottom of the specimen.
Publication Source (Journal or Book title)
Carbohydrate polymers
First Page
464
Last Page
71
Recommended Citation
Simkovic, I., Kelnar, I., Uhliariková, I., Mendichi, R., Mandalika, A., & Elder, T. (2014). Carboxymethylated-, hydroxypropylsulfonated- and quaternized xylan derivative films. Carbohydrate polymers, 110, 464-71. https://doi.org/10.1016/j.carbpol.2014.04.055
