The Relative Characteristics between absorption-desorption Curves and Dyeing Affinities of pre-treated Lyocell Fiber

預處理Lyocell纖維之吸放溼曲線與染料吸附性之關係

10.30167/JOIT.200906.0002

潘毅鈞(Yi-Jun Pan)；嚴建國(Chien-Kuo Yen)

Lyocell纖維 ； 酵素處理 ； 鹼處理 ； 吸溼及放溼 ； 染著吸附性 ； Lyocell ； enzymatic pre-treatment ； caustic pre-treatment ； absorption-desorption ； dyeing affinities

亞東學報

29期（2009 / 06 / 01）

9 - 18

英文

Lyocell纖維經過氫氧化鈉或酵素處理後發現，不同順序的處理方式不僅改變了纖維的機械性質，處理後纖維的吸溼及放溼特性－遲滯現象，以及染料吸附性皆有所改變。酵素處理(ET)、鹼處理(CT)、酵鹼處理(ECT)都能有效增加纖維的吸溼能力，但鹼酵處理(CET)卻有限。比較這些處理方式所獲得的等溫吸、放溼曲線發現，CT以及ECT處理能有效增加纖維直接和間接吸附水的含量，酵素處理則是增加纖維間接吸附水的含量，經CET預處理後，雖能改善纖維吸附間接吸附水的量，但間接吸附水的放溼量則減少。這代表了CET預處理方式雖可增加纖維表面及內部親和性作用基團的數量，但是使得纖維內部空間或空孔的開口變得較狹小，間接吸附水於放溼情況下不能有效的脫離出。此結果可解釋為何當以分子量較小的反應性染料B19染色時（僅吸附不固色），經CET預處理後者的吸附率改善有限，而分子量較大且平面性較高的染料B5染色時，經CET預處理後者的吸附率反而會比未經預處理的原纖維還低。

Lyocell fibers can obtain improving dyeability but damaging mechanical properties after been pre-treated by CT, ET, CET and ECT methods. It was found that the sorption characteristic of the pre-treated fibers can be used as a confident examining tool for reflecting the changes of their fine structures. In general, although each treatment condition was keeping the same, changing the processing sequences would build up substantial different modifications on the fibre fine structures and dyeing behaviours as well. The hydrolysis actions by cellulase at different caustic treatment stages (in ET, CET and ECT methods) would be quite variable. Similarly, the hydration power at enzymatic treatment and different caustic treatment stages (in CT, CET and ECT methods) would also be significant changed too. Therefore, when Lyocell fibres have been pre-treated by caustic and enzyme solution alone or sequentially, their moisture regain and dyeing characteristics would be altered to different extents.

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