Easy fabrication of poly(butyl acrylate)/silicon dioxide core-shell composite microspheres through ultrasonically initiated encapsulation emulsion polymerization

Abstract

In this study, instead of using the usual chemical methods, poly(butyl acrylate)/silicon dioxide (PBA/SiO) core-shell composite microspheres were prepared using a physical method-ultrasonically initiated encapsulation emulsion polymerization. The morphology and particle size of the PBA/SiO microspheres were analysed using transmission electron microscopy (TEM) and dynamic light scattering (DLS). The encapsulation state was determined using X-ray photoelectron spectroscopy (XPS). The composition and thermogravimetric behavior were characterized using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The TEM and DLS results show that monodisperse PBA/SiO core-shell composite microspheres were successfully obtained. The diameter and shell thickness were 150 nm and 15 nm, respectively. The XPS and FTIR results show that there was no new chemical bond between the PBA shell and the SiO core. They were just combined by physical adsorption. The encapsulation efficiency of SiO microspheres by PBA is 8.2% through TGA. In addition, this article focuses on the formation mechanism of PBA/SiO core-shell microspheres prepared through ultrasonically initiated encapsulation emulsion polymerization. Intuitive observation and the results of TEM and DLS, especially the change in zeta potential, clearly indicate an encapsulation process. Thereinto, a bilayer-structure space established by appropriate amount of cetyltrimethyl ammonium bromide (CTAB) molecules is the key to realize ultrasonically initiated encapsulation emulsion polymerization.

Anti-corrosive Prussian blue film modified by polydopamine for energy extraction and sensing in seawater

“…Then, the coordinated water molecules are removed at a temperature range from 150 to 300 °C. 39 The higher residue weight of the PB-PDA films suggests that less water existed in the samples, which is probably caused by coordination between PDA and the PB film because the adsorption and coordination sites for water were occupied by PDA. 40 The X-ray photoelectron spectroscopy (XPS) technique was employed to give the detailed compositional and structural information of the films as well.…”

Recent Progress in Intensifying Synthesis of Acrylic Microspheres for Catalysis

“…[103] Following the ultrasonication, the reaction mixture was photopolymerized after the dispersion in an aqueous PVA solution. Encapsulation with KCl followed by partial conversion with AgCl resulted in finely dispersed uniformly distributed [21] Copyright 2018, Elsevier.…”

“…Through ultrasonically initiated emulsion polymerization, PnBA/SiO 2 core–shell microspheres were synthesized using an ultrasonic probe. [ 21 ] The synthesized microspheres were observed to have a well‐defined spherical size and were monodisperse (narrow size distribution). TEM analysis confirmed the resultant microspheres had no adhesion in between and were core–shell structures with diameter and shell thickness of 150 nm and 15 nm, respectively.…”

“…Especially for the preparation of core–shell microspheres, ultrasonication has been found to be simple, clean, and efficient and proves its universality in terms of the polymerization procedure. [ 21 ]…”

A Facile Route to Prepare PMMA/SiO2 Core‐Shell Particles and PMMA Microcapsules via Sonochemical Graft Polymerization

“…They are widely used in the fields of advanced materials, medicine and bionics . Extensive literature has focused on the preparation of core‐shell composite particles and microcapsules, among which the layer by layer (LBL) self‐assembly method and the template method are most common . However, the former has the disadvantages of experiencing complicated procedures and requiring superb experimental operation.…”