Preparation And Properties Of Phase Change Microcapsules And Fibers Encapsulated With Soy Wax

Energy crisis is increasingly serious and how to improve energy efficiency and develop new energy sources have been significant in scientific research. Since phase change material can store and release energy in the process of phase change, maintain the temperature, reduce energy usage and improve renewable energy utilization, it has been applied to building materials, clothing and other materials. With the problems of easy leakage, polluting environment, phase separation and chemical instability, neat phase change materials can not be applied effectively in general. We used microcapsules and coaxial fiber to encapsulate phase change materials. The results are listed as follows.(1) With the method of in situ polymerization, phase change microcapsules can be prepared by melamine resin coating material and soy wax as core material. By investigating different emulsifiers and core/wall ratio, of which the effect on morphology, structure, size distribution, covering rate and thermodynamic properties of phase-change microcapsule were studied, based on this we can obtain the optimal experimental condition: 0.25 wt % OP-10 in ratio, 1.5 g resorcinol in dosage, and soy wax to melamine resin ratio is 1 : 2. Microencapsulated phase change which prepared under this conditions have uniform morphology, good soy wax coating rate and thermal cycle performance.(2) With the aid of electrospinning, polyvinyl butyral/soy wax and polyurethane/soy wax coaxial fibers can be prepared. By applying differential scanning calorimetry, thermal gravimetric analysis, scanning electron microscopy, and transmission electron microscopy, structure and performance of coaxial composite fiber were tested. Results show that the coaxial electrostatic spinning preparation of composite fiber contains good morphology and structure, thermal properties and cycle performance.