Abstract
In this work, poly(ethylene glycol) (PEG)/boron nitride nanosheets (BNNS) masterbatch was prepared by freeze-drying their ultrasonically homogenized aqueous suspension, followed by melt-mixing with poly(lactic acid) (PLA) to fabricate the nanocomposites. The effect of PEG and BNNS on the crystallization behavior of PLA was investigated. The dynamic mechanical properties, thermal conductivity and thermal stability of the nanocomposites were also evaluated. It was found that, under quiescent conditions, PEG and BNNS had a synergistic effect on accelerating the nonisothermal crystallization of PLA. Unexpectedly, under injection molding conditions, the combination of PEG and BNNS had a negative effect on PLA crystallization. This can be ascribed to the plasticizing effect of PEG, which relaxes the orientation of PLA chains and retards flow-induced crystallization. Dynamic mechanical analysis (DMA) showed that the presence of BNNS enhanced the heat resistance of PLA only when PLA was crystallized, while further incorporation of PEG had a negative effect. Nevertheless, simultaneous use of PEG and BNNS had a synergistic effect on enhancing the thermal conductivity of PLA.
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This work is financially supported by the National Natural Science Foundation of China (52073261, U1704162).
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QL Investigation, Validation, Writing—original draft. RX Investigation. KC Investigation. MJ Writing—review & editing. CL Resources. CS Resources. YW Conceptualization, Supervision, Writing—original draft, Writing—review & editing.
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Li, Q., Xu, R., Chen, K. et al. Combined effect of poly(ethylene glycol) and boron nitride nanosheets on the crystallization behavior and thermal properties of poly(lactic acid). J Therm Anal Calorim 147, 11147–11158 (2022). https://doi.org/10.1007/s10973-022-11308-5
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DOI: https://doi.org/10.1007/s10973-022-11308-5