Optimization of preparing condition for polypropylene-based strong acidic ion exchange fiber

• 1、School of Chemistry and Chemical Engineering, Materials Science Institute, Sun Yat-Sen University, PCFM Lab, OFCM Institute

Abstract：Polypropylene was used as matrix, chlorosulfonic acid sulfonation method, sodium sulfite sulfonation method, as well as direct grafting method using monomers containing sulfonic group were employed to prepare an acidic cation exchange fiber. The effects of the reaction conditions such as reaction time, temperature, sulfonation agent concentration on the degree of grafting were investigated. Advantages of the three different preparation methods were compared. FTIR was used to characterize the corresponding changes in the surface structure before and after grafting and sulfonation, respectively. TG was used to determine the thermal stability of the fiber. The experimental results showed that cation exchange fiber with sulfonic groups can be prepared by these three methods. Chlorosulfonic acid sulfonation method had a higher sulfonation efficiency, but the mechanical strength of the matrix fibers be greatly damaged. Sodium sulfite sulfonation method required a longer reaction time. PP grafted with mixture of acrylic acid (AA) and sodium styrene sulfonate (SSS) method is simple, quick and environmentally friendly. The product had good mechanical strength, but the strong acid part of the exchange capacity is small and need further study.

Keywords： Poly(propylene) fiber Strong acid ion exchange fiber Sulfonation Preparation