聚葡萄胺糖預處理對木材塗裝性能之改善(I)聚葡萄胺糖之製造與基本性質

Abstract

In order to understand the effect of chitin size and alkali treated time on the fundamental properties of chitosan, deacetylated derivative of chitin was examined in this study. Different degrees of deacetylation (DD) of chitosans were prepared by 40% sodium hydroxide solution at 110℃ for 1, 2, 3 and 4 hrs on chitin with 65 and 100 mesh size. The results were observed that with the increase of the alkali treated time, the yield, viscosity, and viscosity average molecular weight of chitosan were lower especially chitin with 100 mesh size. However, the higher DD of chitosan was obtained with the increase of the alkali treated time and from chitin with 100 mesh size than that from 65 mesh. The chitin had been readily deacetylated to form chitosan on alkali treatment by element and FT-IR analysis, except that of 65 mesh size for 1 h. The Tg, tensile strength, and elongation at break of chitosan film made from chitin with 100 mesh size were lower than those from 65 mesh under the same prepared conditions. The trends of the lower tensile strength and the higher elongation at break of citosan film with the increase of the alkali treated time were also found.