3 years ago

Influence of gelation step for preparing PEG–SiO 2 shape-stabilized phase change materials by sol–gel method

Manuel Carmona, Juan F. Rodriguez, Nieves Peco, Jesús Martín Del Campo, Angel Serrano


An in situ shape-stabilized phase change material (ssPCM) from polyethylene glycol (PEG) has been produced by sol–gel method. The inorganic matrix was in situ formed from tetraethyl orthosilicate (TEOS), controlling the condensation rate in a second alkaline step using NaOH. ssPCMs having a latent heat up to 113.8 J/g were synthetized using a sol with a molar ratio H2O:EtOH:H2SO4:PEG1000:TEOS of 2:0.34:0.021:0.50:1 and an equivalent ratio NaOH/H2SO4 of 1.15 for promoting the gel step. The presence of high-density hydrogen bonds between silanol groups and the ether oxygen atoms of PEG and the existence of latent heat allowed to confirm that the PEG worked in two ways. It either forms the PEG–SiO2 matrix or adsorbs onto the surface of the previous polymeric matrix, losing or conserving its latent heat, respectively. The addition of NaOH allowed to change the functionality of the silicon matrix which strongly affected the water content, the thermal stability, and the amount of active PEG in the ssPCMs, leading to an optimal neutralization condition when an equivalent ratio NaOH/H2SO4 of 1.15 was used. The obtained ssPCM has an appropriate range of operative temperatures, a high latent heat in the range of common thermoregulating materials, and a proper thermal reliability.

An in situ shape-stabilized phase change material from polyethylene glycol has been produced by sol–gel method, studying the effect of the condensation step on its final properties.

Publisher URL: https://link.springer.com/article/10.1007/s10971-018-4866-9

DOI: 10.1007/s10971-018-4866-9

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.