Fabrication and characterization of thermo-responsive GO nanosheets with controllable grafting of poly(hexadecyl acrylate) chains
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Abstract
A series of novel poly(hexadecyl acrylate)-grafted-graphene oxides (PHDA-g-GOs) were fabricated as thermo-responsive GO nanosheets via diazonium addition and surface-initiated atom transfer radical polymerization (SI-ATRP). Various spectroscopic and microscopic evidences confirm the successful fabrication of the thermo-responsive GO nanosheets. The thermo-responsive property and thermal stability of the PHDA-g-GOs were determined by DSC and TGA. Furthermore, we have demonstrated the ability to systematically tune the chain length of polymer molecules covalently bonded to GO nanosheets by SI-ATRP. Comparing the thermo-responsive GO samples, the ∆H m and ∆H c increased as the molar ratio of monomer to initiator increased. Moreover, the T mo, T co, ∆H m and ∆H c values of the PHDA-g-GO3 (with a molar ratio of monomer to initiator as 1000:1) are 31.2, 31.4 °C, 79 and 76 J/g, respectively. Meanwhile, the thermo-responsive GO nanosheets have good thermal stability and shape stability. Therefore, the thermo-responsive GO nanosheet is a very promising functional material and can be used in more areas, such as the fabrication of temperature-sensitive drugs, reagents, fibers and textiles, solar energy storage and temperature sensor.
Notes
Acknowledgements
This work was supported by the New Materials Research Key Program of Tianjin (No. 16ZXCLGX00090), the National Key Research and Development Program of China (No. 2016YFB0303000) and State Key Laboratory of Separation Membranes and Membrane Processes.
Supplementary material
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