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Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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HPLC and MALDI-TOF MS analysis of highly branched polystyrene: Resolution enhancement by branching

Cited 20 times inthomson ciCited 22 times inthomson ci
Title
HPLC and MALDI-TOF MS analysis of highly branched polystyrene: Resolution enhancement by branching
Author
Im, KPark, SoojinCho, DChang, TLee, KChoi, N
Keywords
GRADIENT INTERACTION CHROMATOGRAPHY;  FLIGHT MASS-SPECTROMETRY;  LIQUID-CHROMATOGRAPHY;  SYNTHETIC-POLYMERS;  FUNCTIONAL DENDRIMERS;  POLYISOPRENE;  COPOLYMER
Issue Date
2004-05
Publisher
AMER CHEMICAL SOC
Citation
ANALYTICAL CHEMISTRY, v.76, no.9, pp.2638 - 2642
Abstract
Temperature gradient interaction chromatography (TGIC) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) were applied for the characterization of highly branched polystyrenes (PS) prepared by linking living polystyryl anions using 4-chlorodimethylsilylstyrene. Reversed-phase (RP)-TGIC showed an unexpectedly high resolution according to the number of branches despite significant overlap of the molecular weight as confirmed by MALDI-TOF MS. The enhancement of the resolution is ascribed to the contribution of the nonpolar groups in the branched PS: the dimethylsilyl groups in the branching unit as well as the see-butyl initiator groups. As the number of branches increases, the number of nonpolar groups increases, which in turn increases the RP-TGIC retention synergistically with increasing molecular weight. In contrast, a poorer resolution was found in normal-phase-TGIC, in which the nonpolar groups reduce the retention. The resolution in RP-TGIC appears superior to that of liquid chromatography at the chromatographic critical condition (LCCC) of PS. It is seemingly due to the synergistic contribution of the incremental PS molecular weight to the functionality in the branched PS in RP-TGIC while only the functionality contributes to the separation in LCCC. This type of resolution enhancement could be utilized efficiently for the analysis of highly branched polymers such as dendrimers or hyperbranched polymers.
URI
https://scholarworks.unist.ac.kr/handle/201301/6556
DOI
10.1021/ac035506p
ISSN
0003-2700
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