Poly (methyl methacrylate) (PMMA) has been widely used in aerospace field due to its high transmittance, mechanical strength, and chemical stability. However, with the disadvantages of poor thermostability and cold resistance, PMMA is unstable under high or low temperature. This has restricted its further applications as crucial surface materials in aerospace field. In this work, the temperature-dependent mechanical properties of PMMA/CNT nanocomposite with different CNT contents have been investigated using molecular dynamics (MD) simulation and the molecular behaviors have been characterized to reveal the underlying mechanisms. It is found that with increasing temperature from 100 to 500 K, the longitudinal, transverse, and shear moduli of PMMA/CNT nanocomposite decrease by 30%, 45%, and 62% respectively, while the coefficient of thermal expansion increases by 27%. It is found that the atom distribution becomes more dispersed and the nanocomposite structure becomes looser, which lead to the weakened properties of the nanocomposite.
[4] J.F. Wang*, P.H. Li#, X.B. Tian, S.Q. Shi and Lik-ho Tam*, “Molecular investigation on temperature-dependent mechanical properties of PMMA/CNT nanocomposite”, Engineering Fracture Mechanics, 2023, 109705. https://doi.org/10.1016/j.engfracmech.2023.109705
[3] J.F. Wang*, S.Q. Shi, Y.Z. Liu, J.P. Yang# and Lik-ho Tam*, “Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates”, Nonlinear Dynamics, 2022, 109:1517–1550. https://doi.org/10.21203/rs.3.rs-1079170/v1
[2] J.F. Wang, J.P. Yang#, L.-h. Tam* and W. Zhang*, “Effect of CNT volume fractions on nonlinear vibration analysis of composite plates: A multiscale simulation”, Thin-Walled Structures, 2022, 170:108531. https://doi.org/10.1016/j.tws.2021.108513
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