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

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

Department of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029

Corresponding author: Ji-guang Liu, j.liu@bift.edu.cn
Received Date: 23 November 2018
Available Online: 29 December 2018

Magnetic PANI/P(St-NIPAM)/Fe₃O₄ particles with thermosensitive conductivity were prepared via two-step radical polymerization. Copolymerization of styrene (St) and N-isopropylacrylamide (NIPAM) was performed on the surface of modified magnetic ferroferric oxide (Fe₃O₄) to afford P(St-NIPAM)/Fe₃O₄ particles, and PANI/P(St-NIPAM)/Fe₃O₄ 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 Fe₃O₄ 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 Fe₃O₄ to total monomer amount at 1:10. Further measurement at 50 °C displayed a decreased conductivity for all PANI/P(St-NIPAM)/Fe₃O₄ 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.
- Thermosensitivity,
- Conductivity,
- Magnetic particles,
- Smart particles,
- Polyaniline
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