Dendron, polyurethane with side-chain regular dendron, and producing methods thereof

A method for producing a polyurethane with side-chain regular dendron, the polyurethane comprising a structure expressed by the following formula:

• R1 representing diisocyanate, R2 representing polyol, the method comprising the following steps of:
• (a) in a first stage reaction, disposing purified diisocyanate and dehydrated polyol in a flask at 60 degrees in Celsius with aerating nitrogen of gas so as to form a reaction system, keeping the reaction system in circumference reaction for half an hour;
• and
• (b) in a second stage reaction, adding dendron taken as chain extender and dibutyltin dilaurate taken as catalyst into the reaction system, heating the reaction system to be at 80 degrees in Celsius and kept in reaction for 3.5 hours, then after the reaction ends, pouring a solution in the reaction system onto a disk of Teflon to be disposed in an oven for removing solvent, so as to obtain the polyurethane.

A method for producing dendron taken as chain extender for producing polyurethane, the dendron comprising a structure expressed by the following formula:

• R representing alkyl chain of C10˜C18 or perfluoroalkylethyl derivative with more-than-four carbons, the method comprising the following steps of:
• (a) in a first stage reaction, dissolving bifunctional build unit IDD in tetrahydrofuran to form a first solution, adding alcohol into the first solution at 70 degrees in Celsius with aerating nitrogen of gas for 4 hours, after the reaction ends, dropping the first solution into methanol for precipitation and stirring at 70 degrees in Celsius for 6 hours, collecting a first product by exhaust filtering, drying the first product so as to obtain a first intermediate;
• (b) in a second stage reaction, dissolving the first intermediate in dehydrated tetrahydrofuran to form a second solution, aerating nitrogen of gas, stirring the second solution and slowly adding diethylenetriamine at 70 degrees in Celsius, keeping in reaction for 3 hours after a second product starts being precipitated, cooling the second solution to room temperature, washing the second product with mass tetrahydrofuran, drying the second product by exhaust filtering so as to obtain a dendrimer;
• (c) in a third stage reaction, mixing the dendrimer with dehydrated tetrahydrofuran to form a third solution, stirring the third solution with aerating nitrogen of gas at 75 degrees in Celsius, after the dendrimer has been dissolved, adding the bifunctional build unit IDD in the third solution for reaction for 4 hours, drawing part of the tetrahydrofuran, dropping the third solution into methanol for precipitation, obtaining a second intermediate by exhaust filtering and then drying;
• (d) repeating the above steps to produce a third intermediate and a fourth intermediate;
• and
• (e) dissolving the second intermediate, the third intermediate, and the fourth intermediate into dehydrated tetrahydrofuran and mixing with APDEA so as to form a fourth solution, keeping the fourth solution in reaction under aerating nitrogen of gas at 75 degrees in Celsius for 48 hours, after the intermediates have completely reacted, precipitating the fourth solution with methanol and washing incompletely-reacted APDEA out, stirring for 6 hours to obtain the dendron by exhaust filtering and then drying.