Photothermal waterborne polydopamine/polyurethanes with light-to-heat conversion properties

Taş, Cüneyt Erdinç and Berksun, Ekin and Köken, Deniz and Ünal, Serkan and Ünal, Hayriye (2021) Photothermal waterborne polydopamine/polyurethanes with light-to-heat conversion properties. ACS Applied Polymer Materials, 3 (8). pp. 3929-3940. ISSN 2637-6105

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A polydopamine-polyurethane (PDA-WPU)-based polymeric matrix with efficient light-to-heat conversion properties that can initiate light-activated temperature elevations is presented. The polymerization of dopamine monomer in a pre-synthesized aqueous polyurethane dispersion resulted in hybrid polyurethane-polydopamine particles via the coating of discrete waterborne polyurethane (WPU) particles with photothermal polydopamine. The resulting polydopamine-polyurethane (PDA-WPU) dispersions presented a unimodal particle-size distribution and particle sizes that increased as a function of the initial dopamine concentration and polymerization time. Films cast from PDA-WPU dispersions were black-colored and presented a homogeneous morphology with contact angles that decreased with increasing PDA content. While the thermal decomposition behavior and thermal conductivity values of hybrid PDA-WPU films were improved relative to neat WPU films, the glass transition temperatures remained unaffected and the films presented acceptable mechanical properties. PDA-WPU films prepared with the highest amount of polydopamine reached 105.8 °C when irradiated with solar light at 3 sun for 20 min. Five min of irradiation with NIR laser light at 800 mW/cm2 elevated the temperatures of the PDA-WPU films from room temperature to 138.6 °C. Moreover, PDA-WPU dispersions were molded in the form of a container to investigate their potential in solar-driven water-evaporation applications. The hybrid PDA-WPU polymer matrix prepared via a facile postsynthesis modification of WPU dispersions with polydopamine synergistically possesses the features of both components and presents strong photothermal activity along with its easy-to-apply, nanoparticle-free, and environmentally friendly nature; thus, this matrix can be viewed as a promising candidate for a wide range of photo-driven applications.
Item Type: Article
Uncontrolled Keywords: waterborne polyurethane, polydopamine, light-to-heat conversion, solar energy, light harvesting, solar-driven water evaporation
Subjects: T Technology > TP Chemical technology > TP1080 Polymers and polymer manufacture
Divisions: Integrated Manufacturing Technologies Research and Application Center
Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Serkan Ünal
Date Deposited: 22 Aug 2021 10:13
Last Modified: 30 Aug 2022 14:30

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