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4349556 
Journal Article 
Development of o-phthalic anhydride as a low-temperature activator in H2O2 bleaching system for cotton fabric 
Liu, Kai; Zhang, X; Yan, K 
2018 
Yes 
Cellulose
ISSN: 0969-0239
EISSN: 1572-882X 
Springer Netherlands 
Cellulose 
25 
1 
859-867 
English 
WOS:000419902600068 
O-phthalic anhydride (PA) was developed as a low-temperature activator in the H2O2 bleaching system for cotton fabric. The performance of the H2O2/PA bleaching system was investigated by measuring the CIE whiteness index (WI) of the bleached cotton fabric, H2O2 decomposition rate and bursting strength, respectively. The effects of experimental conditions, including PA dosage, bleaching time, bleaching temperature and NaOH concentration, were discussed in the H2O2/PA bleaching system. Upon addition of PA, the WI and H2O2 decomposition rate increased significantly at 70 degrees C. The results showed that the bleaching system had a promising application prospect. Compared with the H2O2 system, the H2O2/PA system significantly promoted O-1(2) generation under the same alkali condition by using 9,10-dimethylanthracene as a fluorescent probe for O-1(2). And the generation of large amount of O-1(2) did not obviously affect the bleaching performance in the H2O2/PA system. By using benzenepentacarboxylic acid as a fluorescent probe for HO center dot detection, it was found that the fluorescence intensity was enhanced 14 folds in the presence of PA, indicating that PA could strongly promote HO center dot generation. By using dimethyl sulfoxide as a scavenger to control HO center dot concentration, it was found that the WI of the fabric was closely related to the HO center dot concentration, revealing that the HO center dot could play an important role in the bleaching process. Phthalic acid was also added to the H2O2 bleaching system to investigate potential bleaching route of the H2O2/PA system. Based on these experimental results, a possible bleaching mechanism of the H2O2/PA system was proposed. 
Cotton fabric; Hydroxide peroxide bleaching; O-phthalic anhydride; Low temperature; Bleach activator