Off-lattice Monte Carlo Simulation For The Conformation Of Block Polymer

The conformation refers to the spatial structure of a polymer determined by the relative locations of its monomers. Many properties of polymer are related to the conformation of a polymer chain, so it is the most fundamental part in the polymer physics.In this dissertation, we first summarize the current experimental, theoretical and computer simulation progresses respectively, and then study the conformation of block copolymer chain and star copolymer by the off-lattice Monte Carlo simulation.The dissertation of M.S.degree is mainly composed of three chapters.The first chapter:Summarization. We summarize the investigations on the conformation of the single polymer chain in the experimental and theoretical sides in recent years, and give a detailed summarization of the computer simulation progresses on this topic.The second chapter:The Off-lattice Monte Carlo simulation on the conformation of single block copolymer chain. The relaxation progress of a single block copolymer chain is studied by means of the off-lattice Monte Carlo simulation. It is shown that the coil-helix transition and coil-globule transition can take place under proper physical conditions. The effect of several factors on the conformations of polymer chain is also discussed.The third chapter:The off-lattice Monte Carlo simulation on the conformation of star copolymer. We simulate the evolutions of the radius of gyration, the mean square radius of gyration and the energy of a star copolymer. It is shown that the star copolymer can display a watermelon conformation under stable conditions, and then some relevant problems are studied.