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Study on Preparation of Single-Chain Polymers and Self-Assembly Structure of Block Copolymers Induced by Solvents

Author: LiuBaoQuan
Tutor: WangYou
School: Harbin Institute of Technology
Course: Materials Physics and Chemistry
Keywords: Single polymer chain Self-assembly Atomic force microscopy Block copolymers
CLC: O631.1
Type: Master's thesis
Year: 2008
Downloads: 58
Quote: 0
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Abstract


This article was prepared by reverse-phase precipitation method polymethyl methacrylate single-stranded polymeric nanoparticles. By the preparation of a dilute solution of the polymer (dilute solution concentration lt; critical overlap concentration) the original one another interpenetrating polymer chain separation, single polymer chain particle solution system. Under stirring, the process of inverting precipitate, single-chain polymer particles will be directly and rapidly precipitated into the precipitation solvent (precipitating agent insoluble polymer, but miscible solvent with a dilute solution - extraction), making this single-chain agglomerates the states preserved, single-chain polymer particles are then obtained by centrifugation or filtration treatment. The laboratory was prepared by precipitation by reversed-phase polystyrene single-chain polymer particles, so this work is proving once again that such a method of preparing high molecular single-stranded universal. For the preparation of single-stranded polymer particles using an atomic force microscope (AFM) for a single-stranded poly (methyl methacrylate) (SCPMMA) particle morphology characterization. Particle diameter measured using AFM and AFM results are consistent with the actual molecular weight of polymethyl methacrylate, and thus prove that the use of the process of preparing the nanoparticles are indeed single polymer in the theoretically calculated molecular weight of the particles, the experimental results show: chain particles. Using differential scanning calorimeter (DSC), Fourier infrared spectroscopy (IR) comparative study of a single polymer chain aggregation structure interpenetrating polymer body chain aggregation structure difference. The results show that indeed there are significant differences between the two, and laid the foundation for the further study of a single polymer chain nanoparticles effect. Xylene, ethanol and distilled water, the three-phase solvent interaction method is placed by SBS SBS Self-assembled nanowires, and to study the process of its formation, to provide a new method for the preparation of block copolymers self-assemble nanowires. A block copolymer of polystyrene - polybutadiene - polystyrene (SBS) film in distilled water, ethanol and xylene three-phase mixed solvent fumigation under the self-assembled structure, for the first time found a self-assembled cake-type structure, explore the mechanism of the formation of this structure, provides a new method for the preparation of polymer micro and nano devices and templates. By AFM carried out a detailed study of commonly used laboratory distilled water, and water by solvent treatment and high temperature ablation material self-assembly of micro-and nano-level study, test results showed that: in distilled water containing a large number of inorganic and organic micro-and nano-level impurities. The results for water to participate in the experiment to provide a reference.

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