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Asymmetrical flow field-flow fractionation as a novel technique for the analysis of PS-b-PI copolymers |
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| Authors: | Ashwell C. Makan Pritish Sinha Nyashadzashe Ngaza Werner van Aswegen Harald Pasch |
| Affiliation: | 1. Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Matieland, South Africa 2. Kansai Plascon Research Centre, Polymer Science Division, University of Stellenbosch, Room 2028, Matieland, 7602, South Africa |
| Abstract: | Asymmetrical flow field-flow fractionation (AF4) was used as a fractionation technique to investigate the molecular heterogeneity of poly(styrene-b-isoprene) diblock copolymers synthesized by either sequential living anionic polymerization or coupling of living precursor blocks. AF4 coupled to multi-angle laser light scattering (MALLS), refractive index (RI), and ultraviolet (UV) detectors was used to separate the diblock copolymers from the homopolymers and coupling products, and the molar masses of the different components were analyzed. In order to get more information about the separated block copolymers, homopolymers, and coupling products, fractions were collected directly after the AF4 channel. The collected fractions were analyzed offline by 1H NMR to provide identification of the different species and additional information on the true chemical composition, and the microstructure of the diblock copolymer was obtained. ? |
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