文献类型：期刊文献

英文题名：Study on the hydrolysis performance of phthalimide disperse dyes

作者：Zhao, Xue[1,2]

机构：[1]Shaoxing Univ, Coll Text & Garment, Shaoxing 312000, Peoples R China;[2]Clean Dyeing & Finishbig Technol Res Lab Zhejiang, Shaoxing 312000, Peoples R China

年份：2019

卷号：163

起止页码：600

外文期刊名：DYES AND PIGMENTS

收录：SCI-EXPANDED(收录号：WOS:000457666300072)、、EI(收录号：20185206316815)、Scopus(收录号：2-s2.0-85059202407)、WOS

语种：英文

外文关键词：Density functional theory; Phthalimide-based disperse dyes; Spectroscopic properties; Hydrolysis mechanism; Intermolecular interactions

外文摘要：Alkali-clearable disperse dyes display high washing fastness on PET. The alkali-clearability of phthalimidyl azo disperse dyes can be explained by the hydrolysis of imido ring creating a water-soluble phthalate groups under alkaline conditions. Hydrolysis performance of six phthalimide disperse dyes were discussed and results were as follows: K/S value of dyed polyester/elastane fabrics decreased obviously as the pH value increased. In generally, the K/S values on dyed PET for all six dyes at pH = 5, 7, 9 and 11 is about equal to 78-92%, 55-67%, 25-42% and 14-29% the K/S value of pH = 3 dyed PET, respectively. Absorption spectra of phthalimide dyes dissolved in alkali solution at temperature 40 degrees C, 60 degrees C and 80 degrees C showed that in the case of alkali dissolving, with increasing in temperature, the absorbance at lambda(max) tended to increase corresponding. The peak at 1770 cm(-1) and 1395 cm(-1) in FTIR spectra of hydrolyzed dye showed that C-O groups appeared under relatively mild alkaline conditions. Hydrolysis influence factor are electron density distribution and steric hindrance effect. Compared with DFT/B3LYP calculated electron density, steric hindrance effect is a more important influence factor than electron density in hydrolysis reaction process. High performance liquid chromatography HPLC results indicate that hydrolysis reaction of phthalimide disperse dye is nucleophilic addition-elimination reaction, which belongs to the SN2 mechanism and pseudo first-order reaction.