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Characterization of Amphiphilic Cobaltocenium Copolymers via Size Exclusion Chromatography with Online Laser-Light Scattering and Viscometric Detectors
Journal of Macromolecular Science Part B-Physics ( IF 1.4 ) Pub Date : 2020-10-14 , DOI: 10.1080/00222348.2020.1819600
Nasrollah Hamidi 1 , Tianyu Zhu 2
Affiliation  

Abstract

A sample of cobaltocenium copolymer (Copolym) obtained by a controlled polymerization method was characterized by a multi-detector size exclusion chromatography (MD-SEC) method eluted by various pure and mixed mobile phases. The value of number average molecular weight ( M ¯ n ), estimated by MD-SEC using the above elutes, was comparable with the ones obtained from the SEC standard calibration curve and estimation by the monomer conversion method. The solution properties of the Copolym were studied based on the Mark-Houwink-Kuhn-Sakurada (MH) relationship where the values of the MH exponent of the Copolym in the above solutions were within the values corresponding to a flexible random coil system. The unperturbed end-to-end dimensions of the Copolym were obtained based on the Stockmayer-Fixman extrapolation method. It was found that the degree of flexibility of the Copolym was higher than that of C-C backbone polymers such as atactic polypropylene, and in the range of poly(acrylic acid), which is suggested to be due to the short-range interference effect of the ionic side chains and solvent molecules on the degree of free rotation of the copolymer.



中文翻译:

通过尺寸排阻色谱和在线激光散射和粘度检测器表征两亲钴to共聚物

摘要

通过多种纯净和混合流动相洗脱的多检测器尺寸排阻色谱(MD-SEC)方法对通过受控聚合方法获得的钴ce共聚物(Copolym)样品进行了表征。数均分子量的值( 中号 ¯ ñ 使用上述洗脱液通过MD-SEC估算的)与从SEC标准校准曲线和单体转化法估算的结果相当。基于Mark-Houwink-Kuhn-Sakurada(MH)关系,研究了Copolym的溶液性质,其中上述溶液中Copolym的MH指数值在对应于柔性随机线圈系统的值之内。基于Stockmayer-Fixman外推法获得了Copolym的不受干扰的端到端尺寸。结果发现,共聚多聚体的柔韧性比CC骨架聚合物(如无规聚丙烯)高,并且在聚丙烯酸范围内,

更新日期:2020-10-14
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