pH-Sensitive Dye-Polyether Derivatives as Dispersants for Its Parent Dye. Part 1: Synthesis and Hydrolysis Behavior

Abstract

A series of dye-polyether derivatives, supposedly to be used as dispersants for parent dye, were synthesized by grafting poly(oxyalkylene)-amines based on differing both molecular weights and degrees of hydrophilicity/hydrophobicity, onto C.I. disperse red 60 via a stable urea linkage. The structures of the dye-polyether derivatives were characterized by FTIR, ¹H NMR, and SEC. The influence of pH on the hydrolysis behaviors of the dye-polyether derivatives were studied in buffered aqueous solutions within the pH range of 4 to 10. The hydrolysis of dye-polyether derivatives was pH dependent and relatively faster in mild alkaline buffer solution than in acidic one. The influence of poly(oxyalkylene)-amine structure on the hydrolysis behavior was also investigated; it was found that the hydrolysis rate is affected little by the molecular weight and increases with the increasing hydrophilicity of the poly(oxyalkylene)-amine.

Keywords:

• Dispersants
• disperse dyes
• dye-polyether derivatives
• hydrolysis behavior
• urea-linked compounds

The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (No. 20973063), the Innovation Foundation for Ph.D. Candidate of Donghua University (DHU) (105-06-0019037) and the Research Foundation of the Key Lab of Textile Science & Technology (Ministry of Education, China).

Notes

PDI = polydispersity index.

^a Estimated by SEC.

^b Provided by the manufacturer.