研究目的
Investigating the viscoelastic changes of block copolymer ion gels in a photo-switchable azobenzene ionic liquid triggered by light.
研究成果
The study demonstrated that UV light can either harden or soften ion gels containing the same photoresponsive IL mixture, depending on the polymer structures. The rheological properties of thermoresponsive ion gels can be tuned using light, and opposite photoresponsive changes of the storage modulus were obtained by slightly modifying the polymer structures.
研究不足
The study is limited by the spatial resolution and operating temperature of thermoresponsive systems. The photoresponsive gel-to-sol transitions in the BMB system were not observed, possibly due to the less swollen cores.
1：Experimental Design and Method Selection:
The study involved the synthesis of ABA triblock copolymers with PBnMA and PPhEtMA as A blocks and their characterization in the presence of a photo-switchable ionic liquid. The rheological and structural changes were monitored under light irradiation.
2：Sample Selection and Data Sources:
Well-defined BMB and PMP triblock copolymers with similar molecular weights were synthesized. A mixture of [Azo][NTf2] and [C1mim][NTf2] was used as the solvent IL.
3：List of Experimental Equipment and Materials:
Rheological measurements were conducted to observe the viscoelastic changes. SAXS measurements were performed to analyze the microphase separation structures.
4：Experimental Procedures and Operational Workflow:
Dynamic temperature sweeps and strain sweep measurements were conducted to observe the sol-gel transitions and mechanical properties. Photoinduced reversible rheological changes were achieved by exploiting the photoisomerization of [Azo][NTf2].
5：2].
Data Analysis Methods:
5. Data Analysis Methods: The SAXS profiles were fitted using the Percus-Yevick hard sphere model to discuss the microphase separation structures in detail.
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