Zeolitic imidazolate framework-67 for shape stabilization and enhanced thermal stability of paraffin-based phase change materials. Issue 18 (29th March 2019)

• Record Type: Journal Article
• Authors: Hu, Yiwen; Song, Xiuduo; Zheng, Qilong; Wang, Jiangning; Pei, Jiangfei
• Is Part Of: RSC advances. Volume 9:Issue 18(2019)
• Page Start: 9962
• Page End: 9967
• Publication Date: 2019-03-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra00874h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Micro-sized ZIF-67 crystals were prepared and used as the reinforcing material to design novel paraffin-based composite phase change materials with a polymethyl methacrylate shell. Abstract : Zeolitic imidazolate framework-67 (ZIF-67), a new kind of metal–organic framework, has large surface area as well as outstanding thermal and chemical stability. In this paper, micro-sized ZIF-67 crystals were prepared and further employed as the reinforcing material to design novel paraffin-based composite phase change materials (PCMs) with a polymethyl methacrylate (PMMA) shell. The composite PCMs were fabricated by using a ZIF-67 crystal-stabilized oil-in-water (O/W) Pickering emulsion as a template. Morphologies and thermal properties of the prepared composite PCMs with different contents of ZIF-67 crystals were determined by SEM, DSC and TGA. Results showed that the ZIF-67 concentration in the emulsion system has a significant effect on the microstructure, phase change behavior and thermal stability of the resultant composite PCMs. When adding 1.5 g of ZIF-67 crystals, the resultant composite PCMs achieved a stable sphere-like structure and had about 106.06 J g −1 of latent heat. The prepared composite PCMs also exhibited a good thermal stability. Compared with pure paraffin, the thermostability of the shape-stabilized paraffin was significantly enhanced at a low content of ZIF-67 crystals.