Unique thermo-induced sequential gel-Sol-gel transition of responsive multiblock copolymer-based hydrogels

Jinming Hu, Zhishen Ge, Yueming Zhou, Yanfeng Zhang, Shiyong Liu

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51 Citations (Scopus)

Abstract

The relative dominance of hydrophobic and electrostatic supramolecular interactions in aqueous solutions of responsive multiblock copolymers was thermoregulated. pH responsive poly(4-vinylpyridine) (P4VP) and thermosensitive random copolymer of N-isopropylacrylamide (NIPAM) and N,N-dimethylacrylamide (DMA), P(NIPAM-co-DMA), were chosen as the two chain sequences alternately arranged in m-P-(NIPAM-co-DMA)-b-P4VP multiblock copolymers. A comparison to the aggregation properties of the multiblock in dilute aqueous solution shows that at 5?C, ionic complexation between protonated P4VP and NDSNa is responsible for the physical gelation, which leads to insolubility of P4VP sequences. Cooling from the gel state at 55?C to 5?C realize sequential gel-sol-gel transition in the reverse order, as compared to that observed in the heating process.
Original languageEnglish
Pages (from-to)5184 - 5187
Number of pages4
JournalMacromolecules
Volume43
Issue number12
DOIs
Publication statusPublished - 2010
Externally publishedYes

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