Study on Preparation of PVA-Borax Hydrogel Based on Polymer Nanomaterials Technology

Abstract

Aiming at the current problem that polyvinyl alcohol (PVA) hydrogel is used as a phase change cold storage agent in cooling clothes, there is a problem that it is too hard after freezing. The article adopts a freezing-thawing method and uses Borax as a performance improvement additive. The Borax-PVA composite hydrogel of polymer cellulose nanocrystal. The results show that 5% PVA solution, 2mL propylene glycol, 2mL glycerol, 10% Borax solution. The PVA hydrogel synthesized under these conditions has a phase transition temperature of -6.2℃ and a phase transition latent heat as high as 243.6J/g, and after being frozen for 24 hours in a low temperature environment of -15℃, the softness is moderate, which is more suitable for cooling clothes.