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溶劑和介質對染料的影響

文章來源:雙騰紙塑制品有限公司 更新時間:2015-11-26 10:27:41

    一般說來,染料如果溶解在飽和烴或其他不活潑的非極性溶劑中成為極稀的溶液,則其吸收光譜往往與染料處于蒸氣狀態時相同,這一事實說明溶劑對染料無影響,似乎只起了把染料分散成單分子的蒸氣狀態一樣。但是,當染料溶解在具有極性的溶劑中時,這樣的溶劑可使染料分子極化而增加極性,使得激化能降低。因此,對絕大部分染料(尤其對不帶電荷的所謂昔染料)來說,增加溶劑的介電常數,能夠加深染料顏色。此外,有些溶劑還能與染料產生氫鍵,甚至有些溶劑還能改變染料分子的結構狀況,則對染料顏色的影響就更加明顯了,如用作指示劑的染料在不同PH值的介質中會顯現出不同的顏色。

    染料在固態介質中,如染料在塑料中或纖維上,也如同在液態的溶劑中一樣,由于環境因素的影響,對其吸收光譜也顯出不同的位移。一般的情況是:染料在極性較小的固體或纖維中,其吸收光譜接近于在非極性溶劑中,介質的極性越是增大,則對顏色的影響也和增加溶劑的介電常數相仿,因此,對于染料來說,在不同的纖維上顯出的顏色是不同的。例如,分散性染料在醋酸纖維上顯出的顏色大都比在聚酰胺纖維(尼龍)上出現的顏色淺,其原因可能就是醋酸纖維的極性低于聚酰胺纖維的極性。http://www.apeveryday.com/product/2015-3-9/583.html


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