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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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Fractionation of block copolymers prepared by anionic polymerization into fractions exhibiting three different morphologies

Cited 38 times inthomson ciCited 40 times inthomson ci
Title
Fractionation of block copolymers prepared by anionic polymerization into fractions exhibiting three different morphologies
Author
Park, SoojinCho, DRyu, JKwon, KLee, WChang, T
Keywords
Interaction chromatography; Polystyrene block polyisoprene diblock copolymers
Issue Date
2002-07
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.35, no.15, pp.5974 - 5979
Abstract
In this study we fractionated polystyrene-block-polyisoprene diblock copolymers (PS-b-PI) prepared by anionic polymerization into fractions which have a narrower distribution in molecular weight as well as in chemical composition. The strategy was to use two-dimensional HPLC: reversed phase HPLC to fractionate PI block and normal phase HPLC to fractionate PS block with a minimal effect of the other block. The working principle of the separation method was confirmed for a low molecular weight PS-b-PI (2.4 kg/mol). With the aid of matrix assisted laser desorption/ionization mass spectrometry, we found that the separation method could resolve each mer of the PS-b-PI. We extended the application to a high molecular weight diblock copolymer (24 kg/mol) and established the method as a promising tool to further fractionate block copolymers into molecular species better defined in molecular weight as well as in composition. We observed a significant variation in average molecular weight as well as in composition of the fractionated samples. These variations were large enough to show different morphologies for the fractions taken from the same mother block copolymer.
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DOI
10.1021/ma0205313
ISSN
0024-9297
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ECHE_Journal Papers
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