Abstract:

In order to promote the application effect of starch in warp sizing, a series of electroneutrally and doubly etherified corn starch (EDES) with different modification levels were prepared by the variations of the feed ratio of the etherifying agents (N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHPTAC) and 3-chloro-2-hydroxy-1-propanesulfonic acid sodium salt (CHPS-Na)) to acid-hydrolyzed corn starch (AHS). The structure of EDES was characterized by Fourier transform infrared analysis. The influence of the double etherification on film properties was investigated in terms of breaking elongation, tensile strength, and degree of crystallinity of the films, as well as degree of swelling of starch. The results show that the double etherification can reduce the degree of crystallinity of the films, and enhance the degree of swelling. The breaking elongation increases from 2.04% of the film before modification to 3.32% of that after modification, and tensile strength decreases from 28.7MPa to 24.9MPa.

Key words: electroneutral double-etherified corn starch, sizing agent, warp sizing, film property, degree of substitution