Molecular Dynamics study on the dielectric relaxation of low relative permittivity and dissipation factor polymers

Microelectronic devices are typically supported on polymeric materials that must adapt to diverse working and environmental conditions. The suitability of the material for a specific application depends on its mechanical, thermal, electric, and chemical properties. In this work, we explore potential polymers for printed circuit board (PCB) substrates for next generation communication devices. Using Molecular Dynamic simulations, we perform dielectric spectroscopy, an experimental technique employed to characterize polymers under electromagnetic radiation. The polarization fluctuations in the materials are assessed by the thermal fluctuations of the individual dipoles, which allows us to calculate the complex permittivity response in a wide range of frequencies. We observe a low relative permittivity and dielectric loss for maileimides and siloxane structures with incorporated phenyl functional groups. Moreover, we found that the static permittivity and relaxation mechanism of the polymers are affected by the number and distribution of the aromatic groups along the backbone.