2MeTHF is expected to be used to develop poly(tetramethylene ether) glycol as a bio-urethane material, which has new performance with excellent chemical and mechanical properties. The purpose is to provide poly(tetramethylene ether) glycol that does not cause coloration and its production method so that its value as an industrial raw material is not reduced. Poly(tetramethylene ether) glycol which is a copolymerization reaction product of tetrahydrofuran and plant-derived 2-methyltetrahydrofuran, wherein the 2-methyltetrahydrofuran is 2-methyltetrahydrofuran purified by a purification step that includes contacting the 2-methyltetrahydrofuran with an acid.

A method for synthesizing polyphenylene ether. The method involves conducting a condensation reaction of polymer monomers and oxygen under the action of a catalyst to form polyphenylene ether. By controlling the addition rate and amount of the catalyst during the reaction process, the molecular weight and molecular weight distribution of the polyphenylene ether can be regulated. Using the synthesis method of the present invention, the molecular weight and molecular weight distribution of the polyphenylene ether product can be effectively controlled by managing the addition rate and amount of the catalyst.