A biological system shows dynamical shapes and tunable mechanical states while working as an actuator and/or sensor. To simulate this, we prepared semicrystalline dynamic ionogels (SDIGs) via a facile process by introducing crystallized polymer domains for phase change and amorphous domains for ionic liquid loading into ionogels. The obtained SDIGs offered tunable mechanical properties upon temperature switching with a change in modulus up to 2 orders of magnitude. It also showed an excellent shape memory effect, shape programmability, and melting accelerated conductivity increase. Enabled by ionic Joule heating technique, the ionogel provided an electrical triggered actuating process to mimic flower blossoming. Moreover, it was demonstrated as a touch sensor with various working shape states, indicating cyclic and green utilization. This work provides insights into the design of semicrystalline electronics and is believed to promote the development of biomimetic actuators and sensors.
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http://dx.doi.org/10.1021/acsami.2c04510 | DOI Listing |
Angew Chem Int Ed Engl
December 2024
Key Labs for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, 200237, Shanghai, CHINA.
High-performance polymers based on dynamic chemistry have been widely explored for multi-field advanced applications. However, noncovalent sacrifice bond mediated energy dissipation mechanism causes a trade-off between mechanical toughness and resilience. Herein, we achieved the synchronous boost of seemingly conflicting material properties including mechanical robustness, toughness and elasticity via the incorporation of mechanical chemistry into traditional semi-crystalline networks.
View Article and Find Full Text PDFAdv Mater
December 2024
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden.
Superinsulating nanofibrillar cellulose foams have the potential to replace fossil-based insulating materials, but the development is hampered by the moisture-dependent heat transport and the lack of direct measurements of phonon transport. Here, inelastic neutron scattering is used together with wide angle X-ray scattering (WAXS) and small angle neutron scattering to relate the moisture-dependent structural modifications to the vibrational dynamics and phonon transport and scattering of cellulose nanofibrils from wood and tunicate, and wood cellulose nanocrystals (W-CNC). The moisture interacted primarily with the disordered regions in nanocellulose, and WAXS showed that the crystallinity and coherence length increased as the moisture content increased.
View Article and Find Full Text PDFPolymers (Basel)
November 2024
School of Automotive Studies, Tongji University, Shanghai 201804, China.
Proton exchange membranes (PEMs) are dominated by semicrystalline structures because highly pure crystals are still challenging to produce and control. Currently, the development and application of PEMs have been hindered by a lack of understanding regarding the effects of microstructure on proton and heat transport properties. Based on an experimentally characterized perfluoro sulfonic acid membrane, the corresponding semicrystalline model and the crystal model contained therein were constructed.
View Article and Find Full Text PDFPolymers (Basel)
November 2024
Branch of Petersburg Nuclear Physics Institute Named by B.P. Konstantinov of National Research Centre «Kurchatov Institute»-Institute of Macromolecular Compounds, Bolshoi, pr. 31 (V.O.), 199004 St. Petersburg, Russia.
Carbohydr Polym
February 2025
College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Environment Correlative Dietology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Hubei Key Laboratory of Fruit & Vegetable Processing & Quality Control, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China. Electronic address:
The aging process endows Chenpi (Pericarpium Citri Reticulatae) with unique value and efficacy. This study investigated the dynamic changes in the fine structure, chain conformation, and morphology of water-soluble polysaccharides from Chenpi over time. In the initial storage period of Chenpi (1 year), Chenpi polysaccharides (CP) exhibited a triple-helical structure, with chains entangled and aggregated into rough spherical conformations.
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