Pickering emulsion polymerized poly(N-methylaniline)/Fe3O4 nanocomposite particles and their dual electrorheological and magnetorheological responses

IF 5.8 2区化学 Q1 POLYMER SCIENCE

European Polymer Journal Pub Date : 2025-04-16 DOI:10.1016/j.eurpolymj.2025.113955

Shizhao Wang , Yong Ku Kwon , Hyoung Jin Choi

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Abstract

Core-shell structured nanocomposite particles with electric/magnetic dual-responsive characteristics were synthesized using a Pickering emulsion polymerization process, in which magnetite (Fe₃O₄) nanoparticles served as a solid particle surfactant for the shell structure, and poly(N-methylaniline) (PNMA) was used as the core structure. In addition to various characterizations of their morphology, chemical and crystalline structures, magnetic and thermal properties, the synthesized PNMA/Fe₃O₄ particles were dispersed in silicone oil to prepare a suspension, and their magnetorheological and electrorheological (ER) properties were investigated using a rotational rheometer. While PNMA does not require a de-doping step for its ER application compared to typical conducting polymers, the suspension exhibited solid-like properties under the action of external electric and magnetic fields with a yield stress of 126.75 Pa under an electric field of 2.5 kV/mm, and 38.88 Pa under a magnetic field of 171kA/m. The yield stresses were directly proportional to the magnetic/electric field strength with slopes of 1.0 and 2.0, respectively.

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Pickering乳液聚合聚n -甲基苯胺/Fe3O4纳米复合粒子及其电流变和磁流变双响应

采用Pickering乳液聚合法制备了具有电/磁双响应特性的核-壳结构纳米复合粒子，其中磁铁矿（Fe3O4）纳米粒子作为固体颗粒表面活性剂，聚n -甲基苯胺（PNMA）为核心结构。将合成的PNMA/Fe3O4颗粒分散在硅油中制备悬浮液，并利用旋转流变仪对其磁流变和电流流变（ER）性能进行了研究。虽然与典型的导电聚合物相比，PNMA在ER应用中不需要脱掺杂步骤，但在外加电场和磁场的作用下，该悬浮液表现出固体状的性质，在2.5 kV/mm的电场下屈服应力为126.75 Pa，在171kA/m的磁场下屈服应力为38.88 Pa。屈服应力与磁场强度成正比，斜率分别为1.0和2.0。

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来源期刊

European Polymer Journal 化学-高分子科学

CiteScore

9.90

自引率

10.00%

发文量

691

审稿时长

23 days

期刊介绍： European Polymer Journal is dedicated to publishing work on fundamental and applied polymer chemistry and macromolecular materials. The journal covers all aspects of polymer synthesis, including polymerization mechanisms and chemical functional transformations, with a focus on novel polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine. The main scope is covered but not limited to the following core research areas: Polymer synthesis and functionalization • Novel synthetic routes for polymerization, functional modification, controlled/living polymerization and precision polymers. Stimuli-responsive polymers • Including shape memory and self-healing polymers. Supramolecular polymers and self-assembly • Molecular recognition and higher order polymer structures. Renewable and sustainable polymers • Bio-based, biodegradable and anti-microbial polymers and polymeric bio-nanocomposites. Polymers at interfaces and surfaces • Chemistry and engineering of surfaces with biological relevance, including patterning, antifouling polymers and polymers for membrane applications. Biomedical applications and nanomedicine • Polymers for regenerative medicine, drug delivery molecular release and gene therapy The scope of European Polymer Journal no longer includes Polymer Physics.