| 摘要 |
A method for making an alkyl polyethylene glycol carbonate by the step of reacting mono-alkyl polyethylene glycol (mPEG) such as mPEG having an avera ge molecular weight of 20,000 grams. Per mole and a polydispersity of less t han 1.1, a chloro formate such as p-nitrophenyl chloroformate, an aromatic s olvent such as toluene and an amine such as tripentylamine. And, a method fo r making a multi-armed polyethylene glycol carbonate by the step of reacting a multi-armed polyethylene glycol having at least one hydroxyl group, a chl oroformate, an aromatic solvent and an amine.
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