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Study on Self-Assembly Morphology Evolution of Block Copolyer by AFM

Author: DongNanShi
Tutor: WangYou
School: Harbin Institute of Technology
Course: Materials Physics and Chemistry
Keywords: block copolymer self-assemble phase separation micelle blend
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 115
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Abstract


Nano-materials have unique properties. Materials with well ordering of nanostructure have been seriously considered for nanotechnological application because of its fancy physical phenomena and the relation to quantum photoelectric component. With the development of the nanometric science and technology which acts as an advanced and crossing subject, block copolymer self assembly technology can be used for making of nano-metal clusters, semiconductor nanomaterials, functional latex nanoparticles, polymer nanomicelle, etc. So there is a wide application prospect in the catalysts, drug carriers, drug delivery, biological and chemical sensors and micro-reactor and other fields.Although the block copolymer microphase separation can occur into orderly structure by self-assemble, if there are no further constraints, the disordered structure maybe instead of the ordered in nature state as self-assembly of microdomian is not in the preferred orientation. Even defective structure can occurred in the process of phase separation. Undermining the performance of the materials, it will lose the unique feature. The block copolymer self-assembly structure is partially accurate in different nanotechnology applications. But it is very difficult to achieve in large-scale long-range order with the micro-nano-structured. Therefore self-assembled nano-micro structure with regulation pattern diversity, high degree of order and stability, become a hot subject in the nanotechonology applications.In this paper, we will study the mechanism of block copolymer self-assembly on the base of kinetics and thermodynamics of block copolymer microdomain separation. In order to establish the foundation of controlling block copolymer self-assembled nanostructure, the effect on self-assembled nanostructure induced by rate of solvent evaporation, solvent fumigation, film thickness and high annealing. We improve the stability and order of the SEBS block copolymer film. We also studied the process that the form of block copolymer micelles have been changed. At last, we explored the morphological changes of the block copolymer and homopolymer blend film with the fumigation of the amphiphilic solvents.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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