摘要
利用 Kelen- Tudos方法测算丙烯腈 (AN)与 N-乙烯基吡咯烷酮 (NVP)自由基共聚合单体竞聚率 ,研究了不同反应体系对单体竞聚率的影响。结果发现 :在水相悬浮聚合体系中 ,转化率小于 1 8%时 ,两单体的竞聚率同 DMSO均相溶液聚合结果相近 ;转化率较大时 ,同溶液聚合结果偏差较大。H2 O/ DMSO混合溶剂悬浮聚合时 ,当水含量超过 6 0 % (质量比 )后 ,单体竞聚率向水相悬浮聚合结果靠近。溶剂的极性增大 ,r AN与 r NVP值均减小。随反应温度升高 。
Effect of different acrylonitrile N vinylpyrrolidone free radical copolymerization systems on reactivity ratios for monomers has been studied. The valoues of reactivity ratios were calculated by the method of Kelen Tudos. It shows that reactivity ratios in aqueous suspension polymerization system are similar to those in solution polymerization system when the conversion is less than 18%. As the conversion increases, the results are very different. H 2O/DMSO mixture solvent was also used for producing the AN NVP copolymer. In water rich reaction medium( m H 2O / m DMSO =60/40), reactivity ratios are equivalent to those in aqueous suspension polymerization system. With an increase of polarity of solvent, both r AN and r NVP reduce. When the reaction temperature rises, reaction gradually changs to ideal copolymerization.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2003年第3期72-74,共3页
Polymer Materials Science & Engineering
基金
国家自然科学基金 (5 97830 0 2 )
