The invention relates to a fluorescent poly
arylene ether nitrile multipolymer and a preparation method thereof, which belong to the technical field of
high polymer materials. The preparation method comprises the following steps: using 2, 6- dichlorobenzonitrile,
phenolphthalein and
phenolphthalein as raw materials and N-pyrrolidone as solvents for carrying out
dehydration reaction for 2 to 5 hours at 140 to 160 DEG C under the effect of catalysts and
dehydration agents, raising the temperature to 180 to 200 DEG C for reaction after the
dehydration agents are evaporated out, stopping the reaction when a pole climbing phenomenon occurs, crushing precipitates obtained through primary
precipitation of reagents via precipitating agents, acidifying the precipitates by dilute
hydrochloric acid, washing the precipitates by boiling water, filtering and
drying the precipitates to obtain crude products, dissolving the crude products by
dimethylformamide, filtering the solution, and obtaining the fluorescent poly
arylene ether nitrile multipolymers after filtering and
drying the precipitates after the secondary
precipitation of filter liquid via the precipitating agents. The invention has the advantages that raw materials can be easily obtained, the reaction condition can be easily realized, the production process is easy to control, no secondary reaction and no byproduct are generated in the
polymerization process, and the prepared fluorescent poly
arylene ether nitrile multipolymer has good
fluorescence performance,
thermal stability,
mechanical property and self
fire resistance and belongs to a novel high-heat-resistance
fluorescent polymer.