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Chemically Interconnected Thermotropic Polymers for Transparency-Tunable and Impact-Resistant Windows.

Cheng Zhang, Heng Deng, Stuart M Kenderes

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    Summary

    Chemically interconnected thermotropic polymers offer tunable transparency for smart windows. This novel poly(glycerol-dodecanoate) system overcomes interface issues, enhancing stability and mechanical properties for energy-efficient applications.

    Keywords:
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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Smart Materials

    Background:

    • Thermotropic polymers are crucial for smart and energy-saving windows, enabling tunable transparency.
    • Current systems often use physical dispersions, leading to poor interfaces, weak adhesion, and reduced long-term stability.
    • Addressing these limitations is key for advanced window technologies.

    Purpose of the Study:

    • To develop a novel, chemically interconnected thermotropic polymer system.
    • To enhance the mechanical properties and long-term stability of thermotropic materials for window applications.
    • To achieve tunable optical transparency through a controlled phase transition.

    Main Methods:

    • Synthesized a chemically interconnected polymer, poly(glycerol-dodecanoate) (PGD), by reacting dodecanedioic acid (DDA) with glycerol.
    • Incorporated non-cross-linked DDA molecules to form semicrystalline domains within the PGD matrix.
    • Evaluated the thermotropic behavior, optical properties, and interfacial bonding of the PGD-DDA system.

    Main Results:

    • The PGD-DDA system exhibits tunable optical transparency due to the solid-liquid phase transition of semicrystalline domains.
    • Demonstrated stable performance over 100 heating-cooling cycles.
    • Achieved significantly improved interfacial bonding to glass substrates (>6910 J m⁻² below transition, >135 J m⁻² above), enhancing window impact resistance.

    Conclusions:

    • The chemically interconnected PGD-DDA polymer offers a robust solution for tunable transparency in smart windows.
    • This approach overcomes the limitations of traditional dispersed systems, providing superior stability and mechanical integrity.
    • The material shows significant potential for energy-efficient building envelopes and advanced glazing applications.