2.1. Materials
100% cotton, bleached, desized and mercerized,was purchased from
Testfabrics, Inc., Shanghai (China). Anhydrous betaine was purchased
from Hangzhou Wan Jing New Materials Co., Ltd. (Zhejiang, China).
Dicyandiamide was purchased from Tianjin Bodi Chemical Co., Ltd.
(China) and was analytically pure. The reactive dyes in this study
were obtained fromShanghai Dyestuff Co. (China) and used as received.
The other reagents and solvents were analytically pure.