Starch-grafted-N-vinylformamide copolymers manufactured by reactive extrusion: synthesis and characterization

T. Spychaj; B. Schmidt; K. Ulfig; A. Markowska-Szczupak

Published : 2012-02-28

Vol. 57 No. 2 (2012)

Starch-grafted-N-vinylformamide copolymers manufactured by reactive extrusion: synthesis and characterization

T. Spychaj B. Schmidt K. Ulfig A. Markowska-Szczupak

Abstract

Potato starch grafted with N-vinylformamide (NVF) copolymers have been manufactured by reactive extrusion in presence of radical initiators: 2,2'-azobis(2-methylpropionamidine) dihydrogen chloride or 2,2'-azobis(isobutyronitrile). During extrusion the following parameters have been changed: screw speed, temperature profile and initiator type whereas constant weight ratio of the reaction components NVF/starch/water 40:100:34 was kept. Raw copolymerization products have been evaluated by solubility tests in alkali aqueous solution at pH 9.0. Contents of graft copolymer in raw copolymerization products have been determined on a basis of extraction with water/ethanol mixture in the ratio of 70:30. FT-IR spectra of starch-g-NVF copolymers have been recorded and polysaccharide chains were subjected to enzymatic degradation using a- and b-amylases. Residual poly(N-vinylformamide) (PNVF) chains were characterized via gel permeation chromatography. Molecular weights of grafted PNVF were compared with literature data of polyacrylamide chains grafted on potato starches.

Keywords

kopolimer szczepiony skrobi ; reaktywne wytłaczanie ; N-winyloformamid starch graft copolymer ; reactive extrusion ; N-vinylformamide

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Spychaj, T., Schmidt, B., Ulfig, K., & Markowska-Szczupak, A. (2012). Starch-grafted-N-vinylformamide copolymers manufactured by reactive extrusion: synthesis and characterization. Polimery, 57(2), 95–100. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/809

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T. Spychaj polimery@ichp.pl

B. Schmidt

K. Ulfig

A. Markowska-Szczupak