Synthesis, separation and characterization of knotted ring polymers
Synthesis, separation and characterization of knotted ring polymers
复制标题
结环聚合物的合成、分离和表征
DOI：
10.1016/j.polymer.2011.12.034
复制
发表时间：
2012
期刊：
影响因子：
4.6
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
A.Takano;et al.
以环己烷为溶剂，在极稀的条件下，通过分子内环合反应成功合成了相对分子质量为380K的打结环状聚苯乙烯(PS)。经SEC和相互作用层析表征，粗产物包括线形前体分子、单环分子和各种分子间反应副产物。粗品经高效相互作用层析多次分级，得到高纯度的打结环分子。SEC-MALS研究发现，打结的环状聚合物的链尺寸明显小于线形和平凡的环状聚合物，而打结的聚合物分子的绝对相对分子质量与相应的分子质量相同。
Knotted ring polystyrene (PS) with molecular weight of 380 k was successfully synthesized by intramolecular cyclization reaction in cyclohexane under extremely diluted condition. Crude product was confirmed to include linear precursor molecule, single ring molecules, and various intermolecular-reacted byproducts by SEC and interaction chromatography characterizations. The crude product was fractionated repeatedly several times by high performance interaction chromatography and finally highly-purified knotted ring molecules were obtained. It has been found by SEC-MALS that the chain dimension of the knotted ring polymers is evidently smaller than those of linear and the trivial ring polymer, while knotted polymer molecules have the same absolute molecular weight as the corresponding counterparts.