Preparation And Performance Of Thermoplastic Cane Lignin Composites With Room Temperature Phase Change Energy Storage Function

Over the last few decades,Nano phase change materials（NPCMs）have received a lot of notice owing to their enormous applications in solar energy collection,heat reclaim and smart buildings.However,obtaining NPCMs with stable shapes at high temperatures（e.g.180℃）without leakage remains a big challenge.At present,almost all reported NPCMs shape stability studies are concentrated below 100℃,which is far from meeting the molding processing requirements of commonly used thermoplastics,such as polyvinyl chloride,the processing temperature under shear force is 140～200℃.This thesis reports for the first time a simple method to prepare a series of novel room temperature NPCMs with good quasi-single dispersion,with a maximum phase change latent calorific value of up to 116.1 J·g^-1,and at an external shear force of 101.9 KN·m^-2,180℃,the developed NPCMs still have excellent shape stability and average grain size of approximate 120 nm.Among them,dodecanool and in situ crosslinked acrylate copolymers are used as heat storage cores and supramolecular locking shell materials for NPCMs,respectively.In addition,this thesis systematically investigates the storage stability,topography,phase transition behavior,and shape stability of the prepared NPCMs under different conditions.The results show that NPCMs have fantastic quasi-monodispersity and shape stability under the simultaneous action of high temperature and shear force,which can meet the molding processing requirements of commonly used thermoplastics.Then,the thermoplastic sugarcane lignin composites with room temperature phase change energy storage function were successfully prepared by adding the produced NCPMs to modified sugarcane lignin using thermoplastic processing method.The dimensional stability,morphology and phase change energy storage capacity of the material have been systematically investigated.The results show that the material can maintain good dimensional stability in the environment of temperature not higher than 70℃.After hot processing at 160℃ and strong shear forces,the NPCMs maintain a good spherical morphology and have good compatibility with modified cane lignin.Phase change energy storage test and infrared thermal imaging test show that room temperature phase change energy storage sugarcane lignin composite material has excellent room temperature phase change energy storage capacity,when the temperature is higher than its phase change temperature（28℃）,the material will absorb energy and store energy;when the temperature is lower than its phase change temperature,the material will slowly release the absorbed energy,thereby reducing the fluctuation range of the system temperature.The material opens up a new avenue for the development of next-generation intelligent buildings,furniture,decorative materials and functional thermoplastic composites with thermal energy storage and release capabilities.