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UV-shielding, flexible and enhanced thermal-conductive polylactide composites modified with single-layered, large-sized MXene nano-sheets

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Abstract

An updated organic solvation-assisted intercalation and collection (OAIC) strategy was developed to prepare high-quality 2D transition metal carbon/nitride (MXene) and evaluate its effects on the structure and properties of polylactide (PLA). Then, PLA composites with different MXene contents were prepared by solution casting method. Transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, UV–visible spectrometry, x-ray diffraction, differential scanning calorimetry, polarized optical microscopy and mechanical tests were used to characterize the MXene/PLA composites. Also, physical models were established to describe the modification mechanism of MXene on PLA. The results show that our updated OAIC strategy successfully prepared single-layered, large-sized MXene nanosheets, which can disperse in both aqueous phase and organic solvent uniformly and stably. MXene and PLA are physically blended in the resultant composites, since PLA shows the typical spherulite morphology. Crystallite size of PLA was refined by the as-synthesized MXene nanosheets. The MXene/PLA composites illustrated prominent UV shielding effect: its UV shielding performance is very close to 100% when the MXene reaches up to 4.0 parts per hundreds of resins (phr). Elongation at break increases to 95.85% with 3.5 phr of MXene, which is 4.32 times that of pure PLA. Thermal conduction of the resultant PLA composites was greatly improved with small amount of MXene: its thermal conductivity was increased up to 0.59 W·m−1·K−1 with 1.0 phr of MXene, which is 2.2 times that of pure PLA.

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Acknowledgements

The authors thank the financial support from the Education Department of the Shaanxi Provincial Government (Program No. 22JC038). Thanks go to Prof. Jianhui Tian at XATU for his sincere help in thermal conductivity measurement.

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Authors and Affiliations

  1. School of Materials Science and Chemical Engineering, Xi’an Technological University, No. 2, Middle Xuefu Road, Weiyang College Park, Xi’an, 710021, China

    Tao Qiang, Xinyu Qi, Lin Hu & Na Hu

  2. Decarbonization Hub, School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China

    Tao Qiang

  3. School of Mechatronic Engineering, Xi’an Technological University, Xi’an, 710021, China

    Honghong Gao

  4. Shaanxi Advanced Materials Beyond Carbon Technology Co., Ltd., Xianyang, 712046, China

    Honghong Gao

  5. China Railway Beijing Engineering Group Co., Ltd, Hefei, 230088, China

    Hua Qiang

  6. College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang, 712000, China

    Shan Wang

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Qiang T and Gao HH involved in design of the experiment, Analysis and interpretation of data, writing the main manuscript, editing. Qi XY and Qiang H involved in acquisition the data. Hu L and Hu N involved in critical revision of the manuscript. Wang S involved in validation of the final version. All authors reviewed the manuscript.

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Qiang, T., Qi, X., Gao, H. et al. UV-shielding, flexible and enhanced thermal-conductive polylactide composites modified with single-layered, large-sized MXene nano-sheets. Polym. Bull. (2024). https://doi.org/10.1007/s00289-024-05303-z

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