| 초록 |
To prepare high molecular weight (HMW) poly(vinyl pivalate) (PVPi) with high yield and high linearity which is a promising precursor for syndiotactic poly(vinyl alcohol) (PVA), vinyl pivalate (VPi) was emulsion polymerized using 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH) as an initiator and sodium dodecyl sulfate (SDS) as an emulsifier. The effect of the polymerization conditions on the conversion, molecular weight, and degree of branching was investigated. PVPi with maximum number-average degree of polymerization (Pn) of 16,700 obtained at polymerization temperature of 50 ℃ using SDS and AAPH concentration of 2.0 × 10-3 mol/liter of water and 1.0 × 10-3 mol/liter of water, respectively, and the maximum conversion was about 91%. From the emulsion polymerization of VPi, spherical PVPi with high yield was effectively prepared, which might be useful for the precursor of syndiotactic PVA particles with various surface properties. |
