通过表面引发的原子转移自由基聚合（SI-ATRP）制备的所有丙烯酸嵌段共聚物/粘土纳米复合材料的合成和表征,Industrial & Engineering Chemistry Research

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通过表面引发的原子转移自由基聚合（SI-ATRP）制备的所有丙烯酸嵌段共聚物/粘土纳米复合材料的合成和表征
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : June 19, 2012 , DOI: 10.1021/ie300953c
Dhruba J. Haloi ₁ , Souvik Ata ₁ , Nikhil K. Singha ₁

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表面引发的聚合（SIP）是一种新兴的强大工具，可用来修改和定制纳米粒子的表面特性。在SIP的不同方法中，与其他聚合方法相比，表面引发的原子转移自由基聚合（SI-ATRP）具有一些战略优势。此调查报告的准备和聚表征（2-乙基己酯）（PEHA）从经由SI-ATRP纳米粘土表面和聚（2-乙基己酯）/粘土纳米复合材料-嵌段-聚（甲基丙烯酸甲酯）（PEHA- b -PMMA ）/粘土纳米复合材料，通过常规ATRP。为了进行SI-ATRP，纳米粘土（Cloisite Na ⁺首先通过经由接枝反应将ATRP引发剂（2-溴丙酰溴）掺入纳米粘土表面来改性）。然后将制备的溴官能化纳米粘土（Clay–Br）用于在90°C下使用CuBr作为催化剂与N，N，N'，N''，N结合使用的丙烯酸2-乙基己酯（EHA）的SI-ATRP ″-五甲基二亚乙基三胺（PMDETA）为配体。使用与EHA的SI-ATRP相同的反应条件，通过常规ATRP，使用大分子引发剂（粘土-PEHA-Br）制备PEHA- b- PMMA /粘土纳米复合材料。通过ATRP制备了一系列PEHA- b- PMMA /粘土纳米复合材料。通过WAXD和TEM分析对制备的PEHA /粘土纳米复合材料和PEHA- b- PMMA /粘土纳米复合材料进行表征。PEHA- b的DSC分析-PMMA /粘土纳米复合材料显示出对应于嵌段共聚物中存在的两个嵌段的两个T _g值。还进行了TGA分析，以研究PEHA /粘土纳米复合材料和PEHA- b -PMMA /粘土纳米复合材料在不同纳米粘土负载下的热稳定性。制备的聚合物的化学结构和分子量通过傅立叶变换红外光谱（FT-IR），¹ H NMR和凝胶渗透色谱法（GPC）分析。

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Synthesis and Characterization of All Acrylic Block Copolymer/Clay Nanocomposites Prepared via Surface Initiated Atom Transfer Radical Polymerization (SI-ATRP)

Surface initiated polymerization (SIP) is an emerging powerful tool to modify and tailor the surface properties of nanoparticles. Among different methods of SIP, surface initiated atom transfer radical polymerization (SI-ATRP) has several strategic advantages over other methods of polymerizations. This investigation reports the preparation and characterization of poly(2-ethylhexyl acrylate) (PEHA)/clay nanocomposite from nanoclay surface via SI-ATRP and poly(2-ethylhexyl acrylate)-block-poly(methyl methacrylate) (PEHA-b-PMMA)/clay nanocomposite via conventional ATRP. To carry out SI-ATRP, the nanoclay (Cloisite Na⁺) surface was first modified by incorporating an ATRP initiator (2-bromopropionyl bromide) to nanoclay surface via a grafting reaction. The prepared bromo-functionalized nanoclay (Clay–Br) was then used to carry out SI-ATRP of 2-ethylhexyl acrylate (EHA) at 90 °C using CuBr as catalyst in combination with N, N, N′, N″, N″- pentamethyl diethylenetriamine (PMDETA) as the ligand. The macroinitiator (clay-PEHA-Br) was used to prepare PEHA-b-PMMA/clay nanocomposites via conventional ATRP using the same reaction conditions as SI-ATRP of EHA. A series of PEHA-b-PMMA/clay nanocomposites were prepared via ATRP. The prepared PEHA/clay nanocomposites and PEHA-b-PMMA/clay nanocomposites were characterized by WAXD and TEM analyses. DSC analysis of PEHA-b-PMMA/clay nanocomposites showed two T_g values corresponding to two blocks present in the block copolymers. TGA analysis was also carried out to study the thermal stability of PEHA/clay nanocomposites and PEHA-b-PMMA/clay nanocomposites at different nanoclay loading. The chemical structure and molecular weights of the prepared polymers were analyzed by Fourier transform infrared (FT-IR), ¹H NMR, and gel permeation chromatography (GPC) analyses.

更新日期：2017-01-31

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