Abstract
Polymer blending is one of important technologies in polymer processing. In this work, we simulated the self-assembly of diblock copolymer Polystyrene-Polyvinylpyrrolidone (PS-PVP) and homo- Polystyrene (homo-PS) by dissipative particle dynamics (DPD) simulation method. The variables we changed are the chain length and volume fraction of added homopolymer, and the system temperature. In NVT ensemble, we investigated how morphology changing with different variables; and understood how lamellar structures formed with control variables. Finally, we used polymer properties such as end-to-end distance, junction point distance, and thickness of lamellar to discuss differences in different lamellar structures. In this thesis, the results show: after blending diblock copolymer with homopolymer, while temperature ranging from 1.0 to 1.4 and the volume fraction of polymer A ranging from 0.5 to 0.6, the equilibrium morphology is lamellar structure. In fixed temperature, while blending short-chained homopolymer, it shows homopolymer would locate between blocks. When blending with long-chained homopolymer, the long-chained homopolymer would be at the central of lamellar. In the case of changing the temperature: at low temperature, the distribution of moderate-chained homopolymer is more similar to short-chained homopolymer; while at high temperature, the distribution of moderate-chained homopolymer is similar to long-chained homopolymer