Nonlinear Phenomena in Complex Systems, 2018, Vol.21, No.4, pp.350

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2018, Vol.21, No.4, pp.350 - 356

PBMA-C₆₀ Composite: Thermal Decomposition, Experiments in Mass-Spectrometer, and Quantum Chemical Modeling
A. O. Pozdnyakov, V. I. Nikolaev, A. L. Pushkarchuk, S. A. Kuten, and A. A. Khrutchinsky

In this paper we discuss mass-spectrometric thermal decomposition experiments with submicron films of neat polybutylmethacrylate, PBMA, and PBMA-fullerene C60 composite. The experiment registers thermal desorption mass-spectra (TDMS) that is the monomer desorption rate versus time upon gradual heating the PBMA films in the given temperature regime. The spectra provide information on the amount of the monomer desorbed at different decomposition stages upon heating the given amount of film material as well as on the spectral shape changes. It is shown that both the amount of monomer and the TDMS spectral shape are sensitive to the presence of fullerene and ultraviolet irradiation. The experimental results are discussed in terms of quantum chemical models of binding. The DFT/B3LYP/3- 21G level of theory was used. The BMA-C₆₀ structures which can yield different amounts of monomer have been compared.

Key words: PBMA-fullerene, thermal decomposition, ultraviolet irradiation, quantum chemical model

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