Estimation of potential photochemical properties for monochlorotriazinyl reactive dyes and their manifestations in the fading of dyed cellulose
Estimation of potential photochemical properties for monochlorotriazinyl reactive dyes and their manifestations in the fading of dyed cellulose
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DOI：
10.1016/s0143-7208(96)00124-6
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发表时间：
1997-12-01
影响因子：
4.5
通讯作者：
Morita, Z
中科院分区：
文献类型：
--
作者：
Okada, Y;Fukuoka, F;Morita, Z
将用10种一氯三嗪基活性染料染色的纤维素薄膜在各种水溶液中暴露于光下，并估计染料的以下潜在光化学反应性：（i）染料光氧化的容易程度，（ii）染料光还原的容易程度，（iii）表观光敏性，以及（iv）在充气水中的褪色速率。干态活性棉染料在辐照下的褪色过程分两步进行，即许多染料在初始阶段有较大的褪色，随后又有缓慢的褪色。在暴露干燥染色的纤维素膜时，几乎没有观察到初始褪色。一些染料的褪色行为可以用它们的潜在性质来解释，而另一些染料的褪色缓慢，可能是由于氧化和还原光褪色过程之间的补偿，即使染料具有高的光反应性。浓度依赖于染色膜的褪色行为可以解释的过滤效果与一些例外，其中具有高光敏性的染料表现出更大或类似的褪色，在深染色比在浅染色。(C)1997年爱思唯尔科学有限公司
Cellulose films dyed with 10 monochlorotriazinyl reactive dyes were exposed to light in various aqueous solutions and the following potential photochemical reactivities of dyes estimated: (i) ease with which the dyes are photo-oxidized, (ii) ease with which dyes are photo-reduced, (iii) apparent photosensitivity, and (iv) the rates of fading in aerated water. On irradiating the dry reactive cotton dyeings, fading proceeded in two steps, viz. many dyes exhibited a considerable initial fading, accompanied by slow subsequent fading. On exposing the dry dyed cellulose films, little initial fading was observed. The fading behavior of some dyes could be explained by their potential properties, while other dyes underwent slow fading, probably due to a compensation between oxidative and reductive photofading processes even though the dyes had high photoreactivity. The concentration dependence on the fading behavior of dyed films could be explained by the filter effect with some exceptions, where dyes with high photosensitivity showed larger or similar fading in deep dyeings than that in the paler dyeings. (C) 1997 Elsevier Science Ltd.