Synthesis of Hydrophobically Associating Starch and Research on Its Solution Properties
Liu Xiang-yi, XU Xiao-jun · Fain kemikaru · 2006
The hydrophobically associating starch(PSOAM) was synthesized by inverse suspension polymerization with redox initator,and its solution properties were researched.When m(starch)∶m(acrylamide)∶m(octadecyl acrylate)=4∶7.4∶0.6,reaction temperature was 40 ℃ and reaction time was 3 h,the monomer conversion and graft percentage were 94.6% and 53.8% respectively and M_n=2.23×10~6.When c(PSOAM)=0.3 g/L at 30 ℃,in pure water and in saline(c(NaCl)=0.20 mol/L),the apparent viscosities were 21.0 mPa·s and 25.6 mPa·s and the surface tensions were 56.4 mN/m and 48.4 mN/m,respectively.The apparent viscosity retaining ratio was 69% at 70 ℃ and the apparent viscosity debasement was 60% at shear rate 1/50 s~(-1) when c(PSOAM)=0.3 g/L.