The preparation of PVAc with lower PDI through RATRP in miniemulsion polymerization

摘要

In this paper, reverse atom transfer radical polymerization (RATRP) was used to prepare polyvinyl acetate (PVAc) with lower polydispersity index (PDI). The different reaction parameters such as ligand, catalyst, and surfactant were studied separately to control the polymerization of VAc. The results show that RATRP is not controlled with bpy as ligand, but it is possible to obtain PVAc with low PDI when PMDETA was used as ligand. The molecular weight and the PDI is 10.71×10 ~4 and 1.62 when the molar ratio of AIBN/CuC _(l2)/PMDETA is 1.5:1:2, the molar ratio of AIBN to VAc is 0.5%, surfactant to deionized water is 10 wt%. The molecular weight and the PDI is 12.81×10 ~4 and 1.48 when the molar ratio of AIBN/CuC _(l2)/PMDETA is 2:1:2. The structure of the polymer and the polymer conversion were investigated through ~1H-NMR and gravity method separately. The molecular weight (Mn) and the polydispersity of the obtained polymers were characterized through gel permeation chromatography (GPC).