Grafting PMMA Brushes from α-Alumina Nanoparticles via SI-ATRP

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• 作者：Amir Khabibullin ; Karan Bhangaonkar ; Clare Mahoney ; Zhao Lu ; Michael Schmitt ; Ali Kemal Sekizkardes ; Michael R. Bockstaller ; Krzysztof Matyjaszewski
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：8
• 期：8
• 页码：5458-5465
• 全文大小：446K
• ISSN：1944-8252

文摘

Alumina nanoparticles are widely used as nanofillers for polymer nanocomposites. Among several different polymorphs of alumina, α-alumina has the most desirable combination of physical properties. Hence, the attachment of polymer chains to α-alumina to enhance compatibility in polymeric matrixes is an important goal. However, the chemical inertness and low concentration of surface hydroxyl groups have rendered polymer modification of α-alumina a long-standing challenge. Herein, we report that activation of α-alumina in concentrated or molten NaOH as well as in molten K₂S₂O₇ increased polymer graft density up to 50%, thereby facilitating the synthesis of α-alumina brush particles with uniform grafting density of 0.05 nm^–2 that are readily miscible or dispersible in organic solvents or in chemically compatible polymeric hosts.