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Preparation and Study on Micelles of EO-PO-EO Triblock Copolymers

Author: LiuJia
Tutor: ChengBin
School: Beijing University of Chemical Technology
Course: Materials Science
Keywords: propylene oxide anionic ring-opening polymerization relative molecular mass distribution ethylene oxide PEO-PPO-PEO triblock copolymer micelle diameter
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 284
Quote: 2
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Abstract


The copolymer of ethylene oxide and propylene oxide is a very important type of non-ionic surface active agent, the properties of which could be monitored by changing the relative molecular mass or the ratios of ethylene oxide to propylene oxide. Ever since its first appearance, the copolymer of ethylene oxide and propylene oxide has been developed at a surprising fast speed and widely used in both industries and everyday life. Furthermore, in the past decade, it is playing a more and more important role in the fields of biomaterials, nanomaterials and mesoporous materials.PEO-PPO-PEO triblock copolymer has become one of the most important templates in making mesoporous materials as a result of its excellent integrity of the arrangements of segments. For the PEO-PPO-PEO triblock copolymer, the PEO segment can resolve fully in water, while the PPO segment has bad solubility, in this way, water becomes a solvent of selectivity to the triblock copolymer. While dissolving in water, the differences in the solubility of different segments become the main factor in judging whether there is micelle forming in the water solution. By characterization of the micelles formed in the water solution of PEO-PPO-PEO triblock copolymer, properties of mesoporous materials using the triblock copolymer as templates can be obtained.In this thesis, intiating system with 1, 2- propylene glycol as initiator were studied. Different kinds of dehydrating methods in different initiating methods were studied and compared. Also, an improved initiating method with better dehydrating effects was originated. The results showed that higher relative molecular mass and much narrower relative molecular mass distribution were obtained by the new initiating method. In this way, the molecular structure of the polyether can be better controlled.What’s more, by the polymerization of a series of PEO-PPO-PEO triblock copolymers of different ethylene oxide/propylene oxide ratios, different micelles of different ratios were prepared and characterized.

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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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