Fast and efficient single step liquid chromatography separation of parent homopolymers from block copolymers

2021 ◽  
pp. 462441
Author(s):  
Miloš Netopilík ◽  
Miroslav Janata ◽  
Olga Trhlíková ◽  
Dušan Berek
Keyword(s):  
Liquid Chromatography ◽  
Block Copolymers ◽  
Single Step ◽  
Liquid Chromatography Separation

scholarly journals Separation of Poly(styrene-block-t-butyl methacrylate) Copolymers by Various Liquid Chromatography Techniques

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Tina Šmigovec Ljubič ◽  
David Pahovnik ◽  
Majda Žigon ◽  
Ema Žagar
Keyword(s):  
Liquid Chromatography ◽  
Block Copolymers ◽  
Molar Mass ◽  
Small Difference ◽  
Reversed Phase ◽  
Butyl Methacrylate ◽  
Critical Conditions ◽  
Chromatographic Techniques ◽  
Methacrylate Copolymers ◽  
Gradient Liquid Chromatography

The separation of a mixture of three poly(styrene-block-t-butyl methacrylate) copolymers (PS-b-PtBMA), consisting of polystyrene (PS) blocks of similar length andt-butyl methacrylate (PtBMA) blocks of different lengths, was performed using various chromatographic techniques, that is, a gradient liquid chromatography on reversed-phase (C18 and C8) and normal-phase columns, a liquid chromatography under critical conditions for polystyrene as well as a fully automated two-dimensional liquid chromatography that separates block copolymers by chemical composition in the first dimension and by molar mass in the second dimension. The results show that a partial separation of the mixture of PS-b-PtBMA copolymers can be achieved only by gradient liquid chromatography on reversed-phase columns. The coelution of the two block copolymers is ascribed to a much shorter PtBMA block length, compared to the PS block, as well as a small difference in the length of the PtBMA block in two of these copolymers, which was confirmed by SEC-MALS and NMR spectroscopy.

scholarly journals High-Yield, Single-Step Separation of Metallic and Semiconducting SWCNTs Using Block Copolymers at Low Temperatures

2014 ◽  
Vol 118 (29) ◽  
pp. 16156-16164 ◽  
Author(s):  
Christa M. Homenick ◽  
Alexander Rousina-Webb ◽  
Fuyong Cheng ◽  
Michael B. Jakubinek ◽  
Patrick R. L. Malenfant ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Low Temperatures ◽  
Single Step ◽  
High Yield
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