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Preparation and Rheological Properties of Styrene and Sodium Styrene Sulfonate Copolymer

DENG Kang-wei;CHEN Long;PAN Dan;SUN Jun-fen;QIN Zong-yi;College of Materials Science and Engineering,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University;  
A dyeable modification additive for polypropylene fiber,styrene and sodium styrene sulfonate copolymer P(St-co-NaSS)was prepared by the emulsion copolymerization method.The structural units of sodium styrene sulfonate in copolymer were characterized by Fourier Transform Infrared spectroscopy(FT-IR)and Nuclear Magnetic Resonance(~1 H-NMR).The effects of reaction conditions on sulfonation degree of copolymer were studied.The effects of introduction of sulfonic acid groups on glass transition temperature and initial decomposition temperature were studied by Differential Scanning Calorimeter(DSC)and Thermogravimetric analysis(TG).The effects of sulfonation degree on the shear viscosity of copolymer were studied by rotation rheometers.The results show that sulfonation degrees of copolymer reach 6.68%(the zero shear viscosity is 19 620Pa·s,belong to Newtonian fluid)when reaction time is2 h,reaction temperature is 70 ℃,the used initiator mass fraction is 0.6%,the molar fraction of sodium styrene sulfonate is 0.01.The copolymer shows the characteristics of pseudoplastic fluid and good processing fluidity.For PP/P(St-co-NaSS)blends,the K/Svalue(dyeing depth)stained with the cationic dye was 2.603 2,the K/Svalue stained with the disperse dye was 10.168 8.The P(St-co-NaSS)is suitable as a dyeable modification additive for polypropylene fiber.
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