Shear viscosity of Polydimethylsiloxane melt by molecular dynamics simulation

Polydimethylsiloxane (PDMS) widely used in the micro-electro-mechanical system and microfluidics system. The viscosity of the melt affects the flow and deformation of the polymer during molding. Polymer flow is not a simple slip of the polymer chain segment, but the result of segment movement. The viscosity of PDMS has been calculated by the molecular dynamic simulation based on the Green-Kubo (GK) formula. The simulation for calculating viscosity run using the LAMMPS, where the united atom force field for Polydimethylsiloxane (PDMS) was used. It was found that with the increase of chain dimensions and crosslinking rate within a certain range, its viscosity increased.