Silica-coated poly(glycidyl methacrylate-ethylene dimethacrylate) beads containing organic phase change materials

Abstract

Macroporous sorbents differing in size were prepared by the 2,2ʹ-azobis(isobutyronitrile) (AIBN)-initiated suspension radical polymerization of glycidyl methacrylate and ethylene dimethacrylate in the presence of an inert porogen. The microspheres were loaded with paraffin and cetyl alcohol phase change materials (PCMs) and coated with silica by sol-gel method using trimethoxy(methyl)silane hydrolysate. The energy storing capacity of the PCM-containing composite particles was monitored by differential scanning calorimetry. Accelerated thermal cycling tests were carried out to determine the thermal reliability of the microencapsulated PCMs. Paraffin and cetyl alcohol content in the microcapsules was 42.9 wt.% and 48.9 wt.%, respectively. The microcomposites with higher PCM content showed correspondingly higher latent heat storage capacity (melting and solidification enthalpies were 96.1 J/g and 94.5 J/g, respectively). However, there was low enthalpy change observed after 1000 thermal cycles of cetyl alcohol-containing capsules, which indicated that PCM leakage from the microspheres was minimal.

Synthesis, Characterization and Application of a MIP-polyHIPE for Selective Extraction of Angiotensin II Receptor Antagonists Residues in Natural Waters

“…The monomers used were butyl acrylate, since its high glass transition temperature ensures good mechanical stability under solvent flow, trimethylolpropane triacrylate (cross-linker) to guarantee a high cross-linking density and consequent structural stability, and glycidyl methacrylate as a functional monomer. The latter has recently gained much attention in preparing stable spherical polymers [ 21 , 22 , 23 ]. Moreover, the possible opening of the glycidyl methacrylate’s epoxy ring could provide hydroxyl groups that can interact with template molecules [ 24 ].…”

Efficient preparation of polydimethylsiloxane‐based phase change composites with sandwich structure

“…32 Therefore, in order to solve the leakage problem and make prepared composites better use as thermal management materials (TMMs), it is necessary to improve the stability of PCMs. [33][34][35] Many studies have prepared stable solid-liquid PCCs by adding micromolecule phase change fillers to polymer matrices. 36 The selection of polymer matrix including polydimethylsiloxane (PDMS), epoxy (EP), polyurethane (PU) and so on [37][38][39][40][41][42] is an important issue.…”

“…However, these methods cannot effectively solve the packaging problem of PCMs 32 . Therefore, in order to solve the leakage problem and make prepared composites better use as thermal management materials (TMMs), it is necessary to improve the stability of PCMs 33–35 . Many studies have prepared stable solid–liquid PCCs by adding micro‐molecule phase change fillers to polymer matrices 36 .…”