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

Effects of Treatments using Alcohol-Borne Protectors on the Green Color Fastness of Makino Bamboo

盧崑宗(Kun-Tsung Lu) ； 張立瑜(Li-Yu Chang)

《中華林學季刊》 37卷1期 (2004/03) Pp. 89-99

https://doi.org/10.30064/QJCF.200403.0007

摘要

本研究乃利用40%氫氧化鈉水溶液，在110℃下行熱鹼處理，將幾丁質水解去乙醯化而得聚葡萄胺糖，分析幾丁質粒徑及不同鹼處理時間對聚葡萄胺糖性質之影響。試驗結果顯示，聚葡萄胺糖之收率、黏度及黏度平均分子量，均隨鹼處理時間之延長而降低，且以100mesh幾丁質製備者較65mesh者為低；去乙醯度則隨鹼處理時間之延長而增加，其中又以100mesh製備者較65mesh者為高。經由元素分析及FT-IR光譜分析結果，除由65mesh幾丁質經鹼處理1h者外，其餘處理條件均可將幾丁質水解成為聚葡萄胺糖。由DSC分析結果，聚葡萄胺糖之Tg值均較幾丁質者為低，且在相同製造條件下，以粒徑100mesh幾丁質製造者較65mesh者為低。聚葡萄胺糖塗膜之拉伸強度與破壞伸長率，在相同製造條件下，均有以65mesh幾丁質製備者優於100mesh者，而塗膜拉伸強度隨鹼處理時間增長而降低，但破壞伸長率則卻隨之而提高之趨勢。

關鍵字

幾丁質 ； 聚葡萄胺糖 ； 木材 ； 預處理 ； 塗裝性

並列摘要

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.

並列關鍵字

Chitin ； Chitosan ； Wood ； Pretreatment ； Finishing performance