Pickering emulsion polymerization of poly(ionic liquid)s encapsulated nano-SiO2 composite particles with enhanced electro-responsive characteristic. (20th June 2018)

• Record Type: Journal Article
• Authors: Zhao, Jia; Liu, Yang; Zheng, Chen; Lei, Qi; Dong, Yuezhen; Zhao, Xiaopeng; Yin, Jianbo
• Is Part Of: Polymer. Volume 146(2018)
• Page Start: 109
• Page End: 119
• Publication Date: 2018-06-20
• Subjects: Elecrorheology -- Poly(ionic liquid)s -- Pickering emulsion polymerization; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.05.030
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Poly(ionic liquid)s (PILs) encapsulated nano-SiO2 composite particles were synthesized by a Pickering emulsion polymerization and used as stimuli-responsive electorheological (ER) particles, which showed enhanced electro-responsive effectiveness and temperature stability. Methacryloxypropyltrimethoxysilane modified nano-SiO2 particles with size of 15 nm were used as solid surfactant, which could not only help to form emulsion droplets of IL monomer but also immerse into droplets to form nanocomposite particles after polymerization. The morphology of the nanocomposite particles was characterized by scanning electron microscopy and transmission electron microscopy, while the chemical structure was analyzed by thermogravimetric analysis and Fourier transform infrared spectroscopy. Under electric field, ER property of the nanocomposite particles when dispersed in insulating oil was characterized by temperature-modulated rheology. Through comparing with pure PILs particles, we found that introducing nano-SiO2 into PILs particles could significantly suppress the excessive growth of leaking current density with increasing temperature and improve the electro-responsive ER effectiveness and temperature stability of ER property. Dielectric spectra analysis indicated that nano-SiO2 could act as cross-linking points to suppress the thermally promoted segment relaxation and improve the activation energy of the ion transport in PILs matrix, and this should be responsible for the enhanced electro-responsive ER effectiveness and temperature stability of PILs encapsulated nano-SiO2 composite particles. Graphical abstract: Poly(ionic liquid)s encapsulated nano-SiO2 composite particles were synthesized by a Pickering emulsion polymerization, which showed enhanced electro-responsive electorheological effectiveness and temperature stability because nano-SiO2 could act as cross-linking points to restrain thermally promoted segment relaxation of poly(ionic liquid)s and improve the activation energy of ion transport. Image 1 Highlights: PILs-encapsulated nano-SiO2 composite particles were synthesized via Pickering emulsion polymerization. Encapsulation with nano-SiO2 suppressed leaking current density and improved temperature stability of ER effect of PILs. Improved temperature stability was because nano-SiO2 as cross-linking points restrained the segment relaxation.