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Magnetorheological suspensions based on modified carbonyl iron particles with an extremely thin poly(n-butyl acrylate) layer and their enhanced stability properties

機(jī)譯：基于改性羰基鐵顆粒的極薄聚丙烯酸正丁酯層的磁流變懸浮液及其增強(qiáng)的穩(wěn)定性

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This study is focused on the modification of magnetic carbonyl iron (CI) particles with a thin polymer shell utilizing the atom-transfer radical polymerization (ATRP) technique, enabling control of the molecular weight and polydispersity of the final grafted polymer chains on the surface of CI particles and therefore also allowing tuning of the magnetorheological (MR) performance as well as stability properties (chemical, sedimentation). Hence, the bare CI particles were coated with a poly(butyl acrylate) (PBA) shell by the ATRP technique. The polymerization procedure of polymer grafting on the surface of the CI particles was characterized by gel permeation chromatography and nuclear magnetic resonance. The presence of the PBA chain on the CI particles was confirmed by Fourier infrared spectroscopy and energy dispersive spectroscopy. A saturation magnetization analysis using vibrating sample magnetometer proved that a thin polymer shell negligibly affects their magnetic properties, and data fit into the Jiles-Atherton model allowed the finite magnetization saturation for both bare CI and CI-PBA particles to be obtained. Furthermore, it was proved that a thin PBA coating provides sufficiently enhanced chemical and sedimentation stability properties for such a system, while the MR performance investigated using a rotational rheometer was affected negligibly. Finally it can be stated that a controllable coating performed via the ATRP technique is a useful tool to significantly improve stability properties, while the MR performance maintains values suitable for real-life applications.
機(jī)譯：這項(xiàng)研究的重點(diǎn)是利用原子轉(zhuǎn)移自由基聚合（ATRP）技術(shù)用薄的聚合物殼修飾磁性羰基鐵（CI）顆粒，從而能夠控制最終接枝聚合物鏈在聚合物表面的分子量和多分散性。 CI粒子，因此也可以調(diào)整磁流變（MR）性能以及穩(wěn)定性（化學(xué)，沉淀）。因此，通過ATRP技術(shù)，將裸露的CI顆粒涂覆有聚丙烯酸丁酯（PBA）殼。通過凝膠滲透色譜和核磁共振表征了聚合物接枝在CI顆粒表面的聚合過程。通過傅立葉紅外光譜和能量色散光譜證實(shí)了CI顆粒上PBA鏈的存在。使用振動(dòng)樣品磁力計(jì)進(jìn)行的飽和磁化強(qiáng)度分析證明，薄的聚合物殼對(duì)磁性能的影響可忽略不計(jì)，并且通過對(duì)Jiles-Atherton模型的數(shù)據(jù)擬合，可以獲得裸CI和CI-PBA粒子的有限磁化飽和度。此外，已經(jīng)證明，薄的PBA涂層為這種系統(tǒng)提供了充分增強(qiáng)的化學(xué)和沉積穩(wěn)定性，而使用旋轉(zhuǎn)流變儀研究的MR性能受到的影響可忽略不計(jì)。最后可以說，通過ATRP技術(shù)進(jìn)行的可控涂層是有效改善穩(wěn)定性的有用工具，而MR性能則保持了適合實(shí)際應(yīng)用的值。

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