Encapsulation of stearic acid with different PMMA-hybrid shell materials for thermotropic materials

Nurten Şahan, Daniel Nigon, Susan C Mantell, Jane H Davidson, Halime Paksoy

Research output: Contribution to journalArticle

Abstract

In this study, we synthesized and characterized particles with a stearic acid (SA) core encapsulated in poly(methyl methacrylate) (PMMA) and four PMMA-hybrid shell materials. The objective was to create spherical particles with diameters of several hundred nanometers for use as the dispersed phase in thermotropic materials for overheat protection of polymer solar absorbers. Encapsulation was accomplished by emulsion polymerization. The composition, morphology and thermal properties of the encapsulated particles were characterized by scanning and transmission microscopy, Fourier transform infrared spectral analysis, digital scanning calorimetry and thermogravimetry. There were no chemical interactions between core and shell materials. The mean diameter and the thickness of the encapsulating shell varied over relatively narrow ranges of 110–360 nm, and 17–60 nm, respectively, depending on the functional groups of the shell. Based on published recommendations for size and shell thickness for thermotropic materials for overheat protection of polymer solar absorbers, particles encapsulated with polymethylmethacrylate-co-2-hydroxy-ethylacrylate (PMMA-HEA) shell and with polymethylmethacrylate-styrene (PMMA-S) shell are good candidates for further evaluation.

Original languageEnglish (US)
Pages (from-to)466-476
Number of pages11
JournalSolar Energy
DOIs
StatePublished - May 15 2019

Fingerprint

Stearic acid
Polymethyl Methacrylate
Polymethyl methacrylates
Encapsulation
Solar absorbers
Polymers
Scanning
Styrene
Emulsion polymerization
Calorimetry
Spectrum analysis
Functional groups
Thermogravimetric analysis
Fourier transforms
Microscopic examination
Thermodynamic properties
Infrared radiation
stearic acid
Chemical analysis

Keywords

  • Microencapsulation
  • PMMA
  • Phase change material
  • Stearic acid
  • Thermal energy storage
  • Thermotropic material

Cite this

Encapsulation of stearic acid with different PMMA-hybrid shell materials for thermotropic materials. / Şahan, Nurten; Nigon, Daniel; Mantell, Susan C; Davidson, Jane H; Paksoy, Halime.

In: Solar Energy, 15.05.2019, p. 466-476.

Research output: Contribution to journalArticle

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