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Preparation method of polyvinyl pivalate using low temperature suspension polymerization of vinyl pivalate and resulting polyvinyl pivalate and polyvinyl alcohol
Preparation method of polyvinyl pivalate using low temperature suspension polymerization of vinyl pivalate and resulting polyvinyl pivalate and polyvinyl alcohol
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机译:利用新戊酸乙烯酯的低温悬浮聚合反应制得的新戊酸聚乙烯醇和聚乙烯醇的方法
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摘要
Poly(vinyl pivalate) exhibiting a high syndiotacticity and a high molecular weight is prepared through suspension polymerization of vinyl pivalate at low temperatures. Furthermore, poly(vinyl pivalate) microspheres with a high syndiotacticity is prepared for use as a precursor for PVA with a high molecular weight and a high syndiotacticity through suspension polymerization of vinyl pivalate at 20 to 70° C. with the use of azobisdimethylvaleronitrile as an initiator. In addition, poly(vinyl pivalate) is separated using a dispersing agent and a precipitating agent to thereby prepare poly(vinyl pivalate) microspheres with various sizes and a uniform size distribution. The poly(vinyl pivalate) microspheres are suspended in an aqueous alkali soloution such that only the surface thereof is saponified to PVA. In this way, embolic particles with a spherical shape are obtained to be useable as an embolic material for embolotherapy.
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