Amphiphilic Poly(ethylene oxide)-block-poly(butadiene-graft-liquid crystal) Copolymers: Synthesis and Self-Assembly in Water

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• 作者：Hong Yang ; Lin Jia ; ChenHui Zhu ; Aurelie Di-Cicco ; Daniel Levy ; Pierre-Antoine Albouy ; Min-Hui Li ; Patrick Keller
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：December 28, 2010
• 年：2010
• 卷：43
• 期：24
• 页码：10442-10451
• 全文大小：1336K
• 年卷期：v.43,no.24(December 28, 2010)
• ISSN：1520-5835

文摘

What could be the self-assembly behavior in aqueous solution for an amphiphilic block copolymer with a very flexible hydrophobic backbone possessing however a liquid crystalline (LC) order? To answer this question, five amphiphilic block copolymers were prepared by grafting, via a thiol−ene addition reaction, four different thiol-functionalized LC mesogens or LC-like side groups on two commercially available poly(ethylene oxide)-block-poly(butadiene) (PEO-b-PB) polymers. These copolymers form monodisperse nanospheres in dilute deionized water with the aid of 1,4-dioxane as cosolvent (dioxane−H₂O system), while in the THF−H₂O system, some give heterogeneous polydisperse micelles and others form large hollow concentric spherical vesicles (“Russian dolls” arrangement). Smectic stripes inside the vesicles and the nanospheres are clearly visualized by cryo-TEM technique.