Research On Phase Change Material Based On PAN Waste

China is the largest producer and consumer of the PAN fibers. Today the demand of PAN fibers has reached hundreds of tons. At the same time, human produced a large number of PAN fiber waste each year. It is a waste of resources and a certain impact on the environment that not using it. There is a strong academic value and social value on recycling and the use of PAN waste. In recent years, people want to find the new fields of recycling the PAN fibers. Phase change materials become the research focus as energy memory. This feature has a great significance in the field of energy efficiency and temperature control. Therefore, the phase change material and its application have a wide range of research topics.We study the recycling and utilization of PAN waste in this paper. Recycle PAN waste to give the material new features. The value and the use of the PAN have been expanded. In this study, the PAN fibers were made to hydrolysis of the PAN (H-PAN) through alkali catalyzed hydrolysis firstly. And than prepared the graft copolymer H-PAN-g-PEG by grafting reaction between H-PAN and polyethylene glycol (PEG), which has the performance of the phase transition. Phase change fibers were made by wet spinning. We get the conditions of the wet spinning process. Studied the fiber-forming at different coagulation bath. Explore influencing factors on the performance of phase change fiber in the spinning process. And describes the mechanical properties and phase transition properties of materials.It was found that:graft copolymer H-PAN-g-PEG has good thermal insulation properties. Comparison of three different coagulation bath, and found that fiber solidification best in DMF. We study the spinning process of the phase change fibers, and determine the best spinning process by orthogonal experiments. The best spinning conditions is spinning solution concentration:20%, crosslinking agent concentration:4%, coagulation bath concentration:90%, the solidification temperature:30℃. The spinning solution concentration is the maximum impact factors on fiber breaking strength, and the crosslinker concentration is the maximum on fiber breaking elongation. To add crosslinker can improve the mechanical properties of the fiber phase transition, and little effect on the apparent morphology of the fiber. The draft can increase the strength of the fiber, three times is the best. To join the H-PAN can also increase the fiber strength and change the insulation properties.