Zone Melting Of Organic Photoelertic And Polymer Materials

As a separation and purification technology,zone melting is characterized by high separation efficiency,low resource consumption and environmental protection.Although the application of zone melting in the field of metals and inorganic semiconductor materials has matured,the application of organic photoelectric and polymer materials remains to be improved.This paper mainly optimizes the model of zone melting and improves the process of zone melting,so that zone melting is more suitable for the separation and purification of organic photoelertic and polymer materials.The main contents were as follows: 1)For the complexity of organic materials,it is necessary to study the phase diagram before purification experiments.The solid-liquid binary phase diagram of FL and BL was drawn by thermal analysis method,and the accuracy of the phase diagram was verified by zone melting experiments.When the mole fraction of FL is 0-0.25 and 0.85-1,we could obtain pure BF and FL,respectively.However,when the mole fraction of FL is 0.25-0.85,the effect of separation can not be achieved through zone melting.In other words,we could obatain the mixtures of BF and FL.Besides,by analyzing the phase diagram of FL and BF,we draw a conclution that the distribution coefficient of FL was 0.36.2)In order to solve the problems of waste and pollution during the separation of organic solid chemicals,a new zone melting purification model based on material balance and theoretical plate was proposed in this paper.For the first purification cycle,the new model shows the similar results to the classical integral model.The advantage is that this model can investigate the several purification cycles other than only one cycle for classical model.This is suitable for the purification of complicated organic photoelectronic materials because they always cannot be purified to satisfied purity only through one purification cycle.The experiments for the purification of a mixture of BF and FL were also carried out.The experimental purity of each sample is close to the theoretically calculated purity when the experimental error is neglected,and after three purification cycles,the purity was improved from less than 90% to 97%.Therefore,the validity of the new model has been verified.3)In order to solve the problem of thermal decomposition of complex organic photoelertic materials and excessive viscosity of polymer materials in the zone melting process,the zone melting process was optimized and a solvent zone melting was proposed.The feasibility and validity of the solvent zone melting in the application of organic photoelectric materials and polymer materials was verified through the purification experiments of FL and BF,the separation and purification experiments of PEG2000 and PEG10000 and the fractionation and purification experiments of PVP.Furthermore,the solvent zone melting was improved by the difference in solubility of the sample in the solvent.