期刊
MACROMOLECULAR SYMPOSIA
卷 237, 期 -, 页码 18-27出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200650503
关键词
block copolymer; chromatography; critical conditions
Block copolymers of ethylene oxide (ECI) and propylene oxide (130) are characterized by liquid chromatography under critical conditions (LCCC) for EO. At the critical adsorption point (CAP) for one structural unit, the non-critical block can elute in size exclusion (SEC) or adsorption (LAC) mode. Depending on the molar mass and architecture of the polymers, different strategies are applied. For samples with a higher molar mass, the SEC separation is the method of choice, while lower molar masses also allow a LAC separation. Examples for both situations are given, which show, that these approaches yield different information. In the SEC mode, homopolymers and diblocks can be separated from the triblocks. In LAC mode, a baseline resolution of individual oligomers can be achieved, in which homopolymers, cliblocks and triblocks with the same number of repeat units of the non-critical block have the same elution volume.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据