Combined stabilizers prepared from cellulose nanocrystals and styrene-maleic anhydride to microencapsulate phase change materials

Shenjie Han; Shaoyi Lyu; Zhilin Chen; Feng Fu; Siqun Wang

doi:10.1016/j.carbpol.2020.115923

Combined stabilizers prepared from cellulose nanocrystals and styrene-maleic anhydride to microencapsulate phase change materials

Carbohydr Polym. 2020 Apr 15:234:115923. doi: 10.1016/j.carbpol.2020.115923. Epub 2020 Jan 30.

Authors

Shenjie Han¹, Shaoyi Lyu¹, Zhilin Chen², Feng Fu³, Siqun Wang⁴

Affiliations

¹ Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
² Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
³ Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China. Electronic address: feng@caf.ac.cn.
⁴ Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China; Center for Renewable Carbon, Department of Forestry, Wildlife & Fisheries, University of Tennessee, Knoxville, TN 37996, USA. Electronic address: swang@utk.edu.

PMID: 32070542
DOI: 10.1016/j.carbpol.2020.115923

Abstract

Cellulose nanocrystals (CNCs) combined with styrene-maleic anhydride (SMA) as stabilizers were used to stabilize paraffin droplets for fabricating paraffin/melamine-urea-formaldehyde (MUF) microcapsules. Effects of mixed emulsifier of CNCs and SMA on the morphologies, chemical structures, and properties of paraffin/MUF microcapsules were characterized by Field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC), and paraffin leakage rate test. The results showed that using CNCs alone as emulsifier did not work in manufacturing paraffin/MUF microcapsules, but mixed emulsifier of CNCs and SMA was suitable. When CNCs and SMA each account for 50 % of the mixed stabilizer, the phase change latent heat values of melting and crystallization of MicroC5S5 were about 123.6 J/g and 118.4 J/g, respectively. This demonstrates that CNCs can be mixed with SMA to stabilize paraffin droplets in situ polymerization and reduce the need for surfactants.

Keywords: Cellulose nanocrystals; Microcapsules; Phase change material; Pickering emulsions; Styrene-maleic anhydride.