Preparation method for hydroxyl terminated polyethylene glycol-polytetrahydrofuran triblock copolyether
The invention discloses a preparation method for hydroxyl terminated polyethylene glycol-polytetrahydrofuran triblock copolyether. The method comprises the following steps: dissolving dry polytetrahydrofuran glycol in a solvent, adding an alkali metal hydride, allowing polytetrahydrofuran glycol and...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses a preparation method for hydroxyl terminated polyethylene glycol-polytetrahydrofuran triblock copolyether. The method comprises the following steps: dissolving dry polytetrahydrofuran glycol in a solvent, adding an alkali metal hydride, allowing polytetrahydrofuran glycol and the alkali metal hydride to react at a temperature of from room temperature to 150 DEG C for more than 1 h to produce polytetrahydrofuran glycol alkoxide, placing the polytetrahydrofuran glycol alkoxide into an autoclave, adding oxirane, initiating oxirane to carry out anionic ring-opening polymerization, and carrying out polymerization at a temperature of from room temperature to 150 DEG C for 1 to 120 h so as to prepare hydroxyl terminated polyethylene glycol-polytetrahydrofuran-polyethylene glycol ABA type block copolyether. The method provided in the invention is stable and controllable; prepared hydroxyl terminated triblock copolyether has a high purity, a definite structure and narrow molecular weight distri |
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