Functionalized Si₃N₄ nanoparticles modified with hydrophobic polymer chains by surface-initiated atom transfer radical polymerization (ATRP)

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• 作者：Na Sun ; Xiangjun Meng ; Zhenggang Xiao ; ^{xiaozhg@njust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanocomposites ; Si3N4 nanoparticle ; Surface functionalization ; ATRP
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：13830-13835
• 全文大小：1510 K

文摘

In order to improve the dispersibility of nanoparticles in polymer matrix, a feasible processing way for grafting high density hydrophobic polymer on the surface of silicon nitride (Si₃N₄) nanoparticles was carried out by an atom transfer radical polymerization (ATRP) method. The ATRP initiators were first immobilized on the surface of Si₃N₄ nanoparticles by using 3-aminopropyltriethoxysilane coupling agent and 2-bromoisobutyryl bromide, and then the polymerization of methyl methacrylate was initiated and propagated on the surface of Si₃N₄ nanoparticles by ATRP reaction. The chemical groups, size, morphology, grafting content, and colloidal thermal stability of PMMA–Si₃N₄ particles were studied by Fourier transform infrared (FTIR), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). Results indicate that the grafting of polymer on the surface of Si₃N₄ nanoparticles is successful and the grafting content of PMMA reaches 60.4%. Moreover, the grafted polymer chains have changed the surface properties of Si₃N₄ nanoparticles and enhanced their dispersibility in organic media.