Effect of halloysite nanotubes on multifunctional properties of coaxially electrospun poly(ethylene glycol)/polyamide-6 nanofibrous thermal energy storage materials

Yilmaz R. B., BAYRAM G., YILMAZER Ü.

THERMOCHIMICA ACTA, vol.690, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 690
  • Publication Date: 2020
  • Doi Number: 10.1016/j.tca.2020.178673
  • Journal Name: THERMOCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Analytical Abstracts, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Coaxial electrospinning, Composite nanofibers, Halloysite nanotubes, Nanoencapsulated phase change material, Thermal energy storage material, Poly(ethylene glycol)/polyamide-6 core/shell nanofibers, PHASE-CHANGE MATERIALS, CHANGE FIBERS, COMPOSITES, PERFORMANCE, FABRICATION, OCTADECANE
  • Middle East Technical University Affiliated: Yes

Abstract

Coaxial electrospinning of poly(ethylene glycol) (PEG)/polyamide 6 (PA6) was successfully used in development of nanofibrous thermal energy storage (TES) material. Halloysite nanotubes (HNTs) were introduced into the core/shell structured TES materials at various concentrations (0.5, 1, 3 and 5 wt. %). Surface activation of HNT was also conducted by piranha etching in order to increase the affinity between piranha-etched nanotubes (HNT-P) and PEG. The core/shell structured materials were characterized using SEM, FTIR, TGA, DSC, tensile and thermal cyclic tests. With incorporation of 3 wt. % HNT-P into the core/shell nanofibers, tensile modulus and latent heat of melting values were increased by 25 % and 21 %, respectively. Additionally, PEG encapsulation efficiency of the neat core/shell nanofibers was increased from 78 % to 96 % with 3 wt. % HNT-P addition. The neat core/shell samples preserved 88 %, whereas 3 wt. % HNT and HNT-P added nanofibrous samples preserved 94 % of their initial melting enthalpies.