Phase Behaviors Of Diblock Copolymer/Homopolymer System Under Confinement Driven By Nanoparticles

Polymer blend system can form many novel structures by self-assemble.However,the polymer blend always forms highly disordered structures in the homogeneous substrate or the bulk.Via confinement and addition can effectively control self-assembly of polymer blend system.In this thesis,we study the phase behaviors of diblock copolymer and homopolymer system driven by nanoparticles under confinement using cell dynamical system(CDS)method of time dependent Ginzbug-Landau theory.Firstly,we study the phase behaviors of diblock copolymer /homopolymer system under two parallel walls confinement driven by nanoparticles.The research find that,under different the distance between walls,the polymer blend system forms various ordered structures with the different concentration and wetting strength of nanoparticles,the morphologies transform lamellae to columnar structure.Meanwhile,we explain the mechanism of phase transformation of polymer.The results show that,via adding nanoparticles can effectively control phase behaviors of polymers system.The results provide a method to control the polymer self-assembly for the theory and experimental study.Next,we study the phase behaviors of diblock copolymer/homopolymer system under sphere confinement driven by nanoparticles.We detailedly study the effect of different concentrations and wetting strength of nanoparticles on the polymer system under different sphere confinement.The results show that,under driven by the nanoparticles,the system realized the transformation of ordered structures with various orientation,transform the double helix structure to the lamellar structure,the single helix structure to the double helix structure,the lamellar structure to the singlehelix structure.The results provide a great theoretical guidance of constructing special performanced new composite material.Through the above research,we found that system of polymer form a series of order morphologies driven by nanoparticles under the confinement,the results provide useful guidance for theory and experiments and industry to prepare order composite material.