Preparation and Performance of Multi-responsive Smart Magnetic Particles with Thermosensitive Conductivity

Jia-wei Liu; Qiang Zhang; Ji-guang Liu

doi:10.11777/j.issn1000-3304.2018.18252

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Preparation and Performance of Multi-responsive Smart Magnetic Particles with Thermosensitive Conductivity

Research Article | 更新时间：2021-01-26

- Preparation and Performance of Multi-responsive Smart Magnetic Particles with Thermosensitive Conductivity
- Acta Polymerica Sinica Vol. 50, Issue 7, Pages: 695-701(2019)
- 作者机构：
  
  北京服装学院材料科学与工程学院　北京 100029
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18252
  CLC：
- Published：2019-7，
  
  Published Online：29 December 2018，
  
  Received：23 November 2018，
扫描看全文
Jia-wei Liu, Qiang Zhang, Ji-guang Liu. Preparation and Performance of Multi-responsive Smart Magnetic Particles with Thermosensitive Conductivity. [J]. Acta Polymerica Sinica 50(7):695-701(2019)
DOI：

Jia-wei Liu, Qiang Zhang, Ji-guang Liu. Preparation and Performance of Multi-responsive Smart Magnetic Particles with Thermosensitive Conductivity. [J]. Acta Polymerica Sinica 50(7):695-701(2019) DOI： 10.11777/j.issn1000-3304.2018.18252.

摘要

通过两步自由基聚合制备了PANI/P(St-NIPAM)/Fe

温敏导电磁性复合颗粒并研究了其导电性能. 首先以改性四氧化三铁(Fe

)、苯乙烯(St)和

-异丙基丙烯酰胺(NIPAM)共聚制备出P(St-NIPAM)/Fe

颗粒，然后进行苯胺吸附与氧化聚合制备出PANI/P(St-NIPAM)/Fe

导电复合颗粒. 用扫描电镜(SEM)、热重分析(TG)和红外(IR)等测试表征颗粒，结果表明复合颗粒具有核壳结构，聚苯胺在颗粒中的含量依赖于NIPAM的投料比. 动态光散射(DLS)结果表明颗粒尺寸对温度具有响应性，复合颗粒同时拥有磁性和导电性. 复合颗粒的电导率研究表明颗粒的导电性可以通过组成调控，在恒定单体投料比的情况下，随着颗粒中聚合物与Fe

重量比从1:1增加到10:1，颗粒溶液25 °C时的电导率从58.4 μS/cm上升到860 μS/cm；在恒定单体总量与磁性颗粒重量比为10:1的情况下，随着NIPAM/St比例从2 mol%增加到10 mol%，颗粒溶液电导率从698 μS/cm增加到1120 μS/cm. 与25 °C的样品相比，在50 °C下颗粒溶液的电导率均明显下降，显示出明显的温度响应性；这种性能对发展温度响应的智能电子材料具有重要意义.

Abstract

Magnetic PANI/P(St-NIPAM)/Fe

particles with thermosensitive conductivity were prepared

via

two-step radical polymerization. Copolymerization of styrene (St) and

-isopropylacrylamide (NIPAM) was performed on the surface of modified magnetic ferroferric oxide (Fe

) to afford P(St-NIPAM)/Fe

particles

and PANI/P(St-NIPAM)/Fe

compounded particles were obtained thereafter from

in situ

oxidation polymerization of aniline inside the particles. Serial characterization including scanning electron microscopy (SEM)

thermogravimetric analysis (TG)

and infrared (IR) spectroscopy indicated that as-prepared particles possessed a core-shell structure

and the content of PANI in particles was closely related to the dosage of NIPAM in polymerization. In addition

dynamic light scattering (DLS) revealed the thermo-responsiveness of particle hydrodynamic diameter. Electrical conductivity of these magnetic particles was investigated in detail

and was found adjustable by the particle composition. Specifically

the conductivity of composite particle solution was enhanced from 58.4 μS/cm to 860 μS/cm when the monomer feed ratio was fixed during polymerization but the ratio of polymer shell to Fe

was changed from 1:1 to 10:1. Meanwhile

the solution conductivity at 25 °C increased gradually from 698 μS/cm to 1120 μS/cm by raising the NIPAM/styrene ratio from 2 mol% to 10 mol% while keeping the ratio of Fe

to total monomer amount at 1:10. Further measurement at 50 °C displayed a decreased conductivity for all PANI/P(St-NIPAM)/Fe

particle solutions regardless of the varied NIPAM/styrene ratio

namely

the composite particles were proved with significant thermosensitivity in terms of their electrical conductivity. A relationship was thereby established between the temperature-sensitivity of particle conductivity and the thermal responsiveness of PNIPAM-induced volumetric change. These smart conductive particles bear huge potentials for extensive applications in biological imaging

sensing

and microelectronic devices.

关键词

温度响应导电性磁性颗粒智能颗粒聚苯胺

Keywords

ThermosensitivityConductivityMagnetic particlesSmart particlesPolyaniline

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Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, School of Chemistry and Materials Science, University of Science and Technology of China

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