Controlled Dielectric Properties of Polymer Composites from Coating Multiwalled Carbon Nanotubes with Octa-acrylate Silsesquioxane through Diels鈥揂lder Cycloaddition and Atom Transfer Radical Polymeriz

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• 作者：Wenjing Zhang ; Zheng Zhou ; Qifang Li ; Guang-Xin Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 23, 2014
• 年：2014
• 卷：53
• 期：16
• 页码：6699-6707
• 全文大小：555K
• 年卷期：v.53,no.16(April 23, 2014)
• ISSN：1520-5045

文摘

A synthetic strategy of coating multiwalled carbon nanotubes (MWCNTs) with cross-linkable octa-acrylate polyhedral oligomeric silsesquioxane (POSS) by combining Diels鈥揂lder cycloadditions with atom transfer radical polymerization in a controlled manner is reported. First, the furfuryl-2-bromoisobutyrate is synthesized by an esterification reaction from 2-bromoisobutyryl bromide and furfuryl alcohol. Then, the MWCNT-based initiators of atom transfer radical polymerization (ATRP) are synthesized through a Diels鈥揂lder reaction between MWCNTs and furfuryl-2-bromoisobutyrate with controlled grafted content. The MWCNT initiators are used to initiate the ATRP reaction of the octa-acrylate POSS on the MWCNT surface. Finally, a core鈥搒hell structure with a MWCNT at the center is obtained, with the thickness of the POSS shell adjusted through different initiators from 5, 10, to 15 nm. The POSS-coated MWCNT is compounded with polyvinylidene fluoride to obtain a kind of composite which has both high dielectric permittivity and low dielectric loss.