Abstract
The impact of the interaction strength between polymer and nanoparticles (NPs), εNP, on the glass transition temperature, Tg, and the phase separation in polymer nanocomposites (PNCs) is explored by employing molecular dynamics simulations. The variation of the Tg with respect to εNP shows interesting behaviors at low and high-volume fractions of nanoparticles (fNP). For εNP < 2, the Tg curves seem to diverge, whereas for εNP > 2, they almost coincide. Interestingly, no sign of any phase separation is witnessed in the investigated PNCs at low fNP. However, at high fNP, obvious phase separation is noticed for low εNP. For both cases, there is no phase separation for εNP > 2. The measurement of the diffusion constants also reveals that the polymer dynamics become independent of the volume fraction of NPs for εNP > 2. We strongly recommend considering this critical value of εNP to avoid phase separation and Tg instability in the case of a high-volume fraction of NPs incorporated into PNCs. Briefly, different behaviors of Tg as the interaction strength between nanoparticles and polymer is increased in relevance to different inserted volume fractions of NPs are observed. Thus, the findings of this work could yield a high impact on the experimental techniques implemented in the fabrication and characterization of NPs–Polymers nanocomposites.
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Acknowledgements
The authors acknowledge their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through Large Groups Project under grant number (RGP2/335/44). The Fifth author would like to acknowledge the financial support provided by the deanship of scientific research at Jordan university of science and technology, Irbid-Jordan (grant number 20200401).
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Khan, R.A.A., Alsaad, A.M., Zulfqar, A. et al. A simulation study on the effect of polymer–NP interaction strength on the glass transition temperature and phase separation in polymer nanocomposites. J Mater Sci 58, 16942–16953 (2023). https://doi.org/10.1007/s10853-023-09074-2
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DOI: https://doi.org/10.1007/s10853-023-09074-2