Modification of Silica Nanoparticles with Miktoarm Polymer Brushes via ATRP
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- 作者：Amir Khabibullin ; Maciej Kopeć…
- 关键词：ATRP ; Binary polymer brushes ; Miktoarm polymer brushes ; Silica nanoparticles ; Microphase separation
- 刊名：Journal of Inorganic and Organometallic Polymers and Materials
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：26
- 期：6
- 页码：1292-1300
- 全文大小：958 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Inorganic Chemistry
Organic Chemistry
Polymer Sciences - 出版者：Springer New York
- ISSN：1574-1451
- 卷排序：26
文摘
Silica nanoparticles were successfully modified with miktoarm brushes via atom transfer radical polymerization (ATRP) using three different approaches. In the first approach: “graft onto and from”, a poly(tert-butyl acrylate) (PtBA) macroinitiator was grafted onto the surface of a monomer-modified silica nanoparticle. Then, polystyrene (PSt) brush was grafted from the surface-tethered reactive chain end. In the second approach: “two-step reverse ATRP”, the PtBA and poly(n-butyl acrylate) (PBA) brushes were consecutively grafted from initiator-modified silica particles via ATRP. The polymerization was initiated from the silica surface via a two-step controlled thermal decomposition of surface-tethered diazo initiator moieties. In the third method: “diblock first”, a diblock copolymer of poly(tert-butyl acrylate) and poly(glycidyl methacrylate) (PtBA-b-PGMA) was grafted onto amine-modified silica particles. The diblock copolymer was covalently attached to the silica surface via interaction between surface-tethered amine groups and the short reactive block containing glycidyl groups. Next, the polystyrene brushes were grafted from surface-tethered reactive chain end. The materials prepared by three different approaches were characterized using gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The PtBA brushes were hydrolyzed under acidic conditions to form poly(acrylic acid) (PAA) brushes. The resulting materials were imaged using atomic force microscopy (AFM) and transmission electron microscopy (TEM).