Preparation of low molecular weight cyclic polystyrenes with high purity via liquid chromatography at the critical condition
SCIE
SCOPUS
- Title
- Preparation of low molecular weight cyclic polystyrenes with high purity via liquid chromatography at the critical condition
- Authors
- Gao, Lingfeng; Oh, Joongsuk; Tu, Yingfeng; Chang, Taihyun
- Date Issued
- 2018-01
- Publisher
- ELSEVIER SCI LTD
- Abstract
- Cyclic polymers synthesized by ring-closure method from linear precursors contain some of linear contaminates. In this work, the origin of linear contaminates in cyclic polystyrenes (c-PS) is demonstrated by the coupling of liquid chromatography at the critical condition (LCCC) with matrix-assisted laser desorption/ionization time-of-flight mass spectra. The linear contaminates are revealed to be the "dead" chains during ATRP by chain termination, the unreacted linear polystyrene (l-PS) precursors, and the dimers by the imperfect ring-closure reaction. The c-PS are purified by LCCC fractionation, and the results show the LCCC fractionation at the critical adsorption point (CAP) of c-PS is more efficient than that at the CAP of linears for low molecular weight (<10,000) PS. A two-step LCCC method is presented for the preparation of c-PS with high purity (>99.6%) via the tandem-coupled LCCC fractionation at the CAP of l-PS and at the CAP of c-PS. (C) 2017 Elsevier Ltd. All rights reserved.
- Keywords
- ACCELERATING CLICK REACTION; RADICAL POLYMERIZATION; LINEAR PRECURSOR; GRAFT COPOLYMER; BLOCK-COPOLYMER; RING POLYMER; CYCLIZATION; ARCHITECTURES; TREFOIL; CHAINS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50549
- DOI
- 10.1016/j.polymer.2017.12.020
- ISSN
- 0032-3861
- Article Type
- Article
- Citation
- POLYMER, vol. 135, page. 279 - 284, 2018-01
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