Study on Synthesis of a Ampholytic Polyphenylene Sulfide (PPS)

Abstract

Ampholytic Polyphenylene Sulfide (PPS) was prepared from PPS by sulfonation, followed by bromination and then the substitution of bromine by quaternary ammonium group and tertiary amine group.The structure and properties of polymers were characterized by FT-IR, TGA, UV and isoelectric point(IEP) measurement. The degree of sulfonation and the content of bromide were investigated by acid base titration and Mohr Method respectively. The results indicated that 47.6% sulfonation degree at 4h, 105°C and a 15ml/g ratio of oluem and PPS, 35.25% content of bromide at 4h, 40°C and 4% FeCl3. Bromine is completely substituted by quaternary ammonium groups at a 1:1.2 ratio of P-SO3-Br and volume of trimethylamine,70°C and 4 h,and that by tertiary amine groups at a 1:1.2 ratio of P-SO3-Br and volume of dimethylamine,80°C and 4 h. Ampholytic PPS shows better solubility and thermostability than PPS.Hyperchromic effect: Br < NH(CH3)2 < N(CH3)3. The IEP of P-SO3-TMA and P-SO3-DMA are 4.08 and 3.84 respectively.