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Synthesis of bifunctional nanoencapsulated phase change materials with nano‐TiO 2 modified polyacrylate shell for thermal energy storage and ultraviolet absorption
Author(s) -
Zhou Jianhua,
Zhao Jiaojiao,
Cui Yanjiao,
Cheng Wenjing
Publication year - 2020
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5924
Subject(s) - nanocapsules , materials science , chemical engineering , thermal stability , fourier transform infrared spectroscopy , particle size , nanoparticle , interfacial polymerization , titanium dioxide , sodium polyacrylate , polymerization , bifunctional , composite material , monomer , polymer , nanotechnology , organic chemistry , chemistry , raw material , catalysis , engineering
Abstract A novel kind of bifunctional nanoencapsulated phase change material with thermal energy storage and ultraviolet absorption functions was successfully prepared through surfactant‐free emulsion polymerization with reactive emulsifiers. These nanocapsules consisted of n‐octadecane and n‐butyl stearate as binary core materials and polyacrylate supplemented with titanium dioxide nanoparticles (nano‐TiO2) as hybrid shell materials. The experimental results show that the monomer conversion and thermal conductivity increased and the particle size and distribution decreased with increase in nano‐TiO2 content when the nano‐TiO2 dosage was below 0.2 wt%. Fourier transform infrared spectroscopy and XRD confirmed that the binary phase change materials were well encapsulated inside the polyacrylate‐TiO2 hybrid shell and nano‐TiO2 was also successfully crosslinked in the nanocapsules. TEM demonstrated that the synthesized nanocapsules exhibited a regular spherical profile and a well‐defined core–shell structure with diameter ranging from 70 to 100 nm. In addition, the results obtained from DSC, TGA and UV–visible spectrophotometry showed that the as‐prepared nanocapsules had good thermal storage capacity, thermal stability and ultraviolet absorption properties. It can be considered that the resultant nanoencapsulated phase change materials with polyacrylate‐TiO2 hybrid shell may have high feasibility and hold good promise in the applications of intelligent thermoregulation fabrics. © 2019 Society of Chemical Industry