Molecular Weight Distribution of Two Types of Living Chains Formed during Nitroxide-Mediated Polymerization of Styrene
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SCOPUS
- Title
- Molecular Weight Distribution of Two Types of Living Chains Formed during Nitroxide-Mediated Polymerization of Styrene
- Authors
- Kim, K.; Lee, J.; Cho, H.Y.; Lee, E.H.; Lee, S.-H.; Chang, T.; Jeon, H.B.; Paik, H.-J.
- Date Issued
- 2021-04
- Publisher
- John Wiley & Sons Ltd.
- Abstract
- Different types of polymer chains generated during the nitroxide-mediated polymerization of styrene are separated for the first time, and their molecular weight distribution (MWD) is investigated. Living and dead chains are monitored during the reaction; specifically, two types of living chains derived from the initiation of the alkoxyamine (RT) and the self-initiation of styrene and dead chains present in the as-prepared polystyrene (PS). To distinguish between each polymer species, different numbers of hydroxyl groups are introduced onto the T and R groups of the alkoxyamine (one and two groups, respectively). Each living and dead chains is resolved according to the distinct number of hydroxyl groups on its chain-end using high-performance liquid chromatography. Molecular structures of the fractionated PS are characterized using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and 1H nuclear magnetic resonance spectroscopy, and the results of which show two distinct initiation paths: one originating from RT and the other from the self-initiation of styrene. Molecular weight and MWD are measured using size-exclusion chromatography and reveal a narrow MWD for the living chains derived from RT. Contrastingly, a broad and skewed MWD is observed for the other living chains derived from the self-initiation of styrene and the dead chains. ? 2021 Wiley-VCH GmbH
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/113263
- DOI
- 10.1002/marc.202000624
- ISSN
- 1022-1336
- Article Type
- Article
- Citation
- Macromolecular Rapid Communications, vol. 42, no. 7, 2021-04
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