超声辐照下PEO与NaMAA嵌段共聚反应的研究

本文研究了在超声波辐照下聚氧化乙烯与甲基丙烯酸钠在水溶液中的嵌段共聚反应和共聚物结构。共聚反应按自由基聚合机理进行。反应动力学方程可用-(d[M]/(dt))=k[R·]^(1/6)[M]表示。随辐照时间或单体浓度的增加,共聚物产率和共聚物中NaMAA含量增大。将1％PEO-105％NaMAA水溶液在频率21.5kHz、阴极电流0.7A的超声强度下辐照15分钟,共聚物的产率为24.0％。用IR、MS、NMR、DSC、TEM等分析了共聚物的化学结构和聚集态结构,表明所得共聚产物为嵌段共聚物。

Studies on Ultrasonic Block Copolymerization of Poly(Ethylene Oxide) with Sodium Methacrylic Acid

The block copolymerization and structure of the copolymer of polyethylene oxide)(PEO)with sodium methacrylic acid(NaMAA)were studied respectively.The ultrasonic copolymerization in PEO-PNaMAAaqueous solution follows the kinetic relationship,-d[M]/dt=k[R]^1/6[M].With increasing irradiation time or monomer concentration,the yield and NaMAAcontent in the block copolymer are increased.The chemical and morphological structure of the copolymer were identified by IR,MS,NMR,TEM,DSCetc.,and the results showed that the copolymer obtained was a block one.The yield of the copolymer,formed by irradiating1% PEO-10% NaMAAaqueous solution for a period of 15 min.at 21.5 kHz with 0.7Acathode current,was 24.0%.