Tadpole-shaped magnetic block copolymer: Self-assembly induced increase of magnetic susceptibility

Tadpole-shaped magnetic block copolymer: Self-assembly induced increase of magnetic susceptibility Self-assembly induced increase of magnetic susceptibility for the tadpole-shaped block copolymer based on paramagnetic FeCl4 pyridinium was reported in this work. The tadpole-shaped block copolymer was prepared by sequential reversible addition-fragmentation chain transfer polymerization of styrene (St) and 4-vinylpyridine (4VP) at the presence of chain transfer agent-modified polyhedral oligomeric silsesquioxanes (POSS). The corresponding magnetic block copolymer (POSS-PSt-b-QP4VP(FeCl4)) was obtained by quternization of 4VP and complexation with FeCl3. The prepared block copolymer was paramagnetic with magnetic susceptibility of 15.4 × 10−6 emu g−1, as investigated by superconducting quantum interference device. Surprisingly, the magnetic susceptibility of the block copolymer was almost doubled (27.5 × 10−6 emu g−1) after self-assembly in thin film. Since the composition of the block copolymer is unchanged, the increase of the susceptibility should be generated by the self-assembly, which makes the magnetic FeCl4− more ordered. And, self-assembly will be an efficient and convenient method in improving magnetic properties of such polymers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Elsevier

Tadpole-shaped magnetic block copolymer: Self-assembly induced increase of magnetic susceptibility

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0032-3861
D.O.I.
10.1016/j.polymer.2017.12.009
Publisher site
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Abstract

Self-assembly induced increase of magnetic susceptibility for the tadpole-shaped block copolymer based on paramagnetic FeCl4 pyridinium was reported in this work. The tadpole-shaped block copolymer was prepared by sequential reversible addition-fragmentation chain transfer polymerization of styrene (St) and 4-vinylpyridine (4VP) at the presence of chain transfer agent-modified polyhedral oligomeric silsesquioxanes (POSS). The corresponding magnetic block copolymer (POSS-PSt-b-QP4VP(FeCl4)) was obtained by quternization of 4VP and complexation with FeCl3. The prepared block copolymer was paramagnetic with magnetic susceptibility of 15.4 × 10−6 emu g−1, as investigated by superconducting quantum interference device. Surprisingly, the magnetic susceptibility of the block copolymer was almost doubled (27.5 × 10−6 emu g−1) after self-assembly in thin film. Since the composition of the block copolymer is unchanged, the increase of the susceptibility should be generated by the self-assembly, which makes the magnetic FeCl4− more ordered. And, self-assembly will be an efficient and convenient method in improving magnetic properties of such polymers.

Journal

PolymerElsevier

Published: Jan 17, 2018

References

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