Rheological Characterization of Lightly Sulfonated Polystyrene Ionomers and Its Blends with Precursor Polystyrene
WANG Jin, ZHENG Xue-Jing, LIU Chen-Yang, CHENG Xing-Guo, HE Jia-Song 
Chem. J. Chinese Universities . 2002, (7): 1437 -1443 .