Novel hyperbranched poly(phenylene oxide)s with phenolic terminal groups: synthesis, characterization, and modification |
| |
Authors: | Jigui Zhang |
| |
Affiliation: | The Key Laboratory for Nanomaterials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, ChaoYang District, Beijing 100029, People's Republic of China |
| |
Abstract: | Novel hyperbranched poly(phenylene oxide)s (HPPOs) with phenolic terminal groups were prepared from 4-bromo-4′,4″-dihydroxytriphenylmethane via a modified Ullmann reaction. This monomer was treated with potassium carbonate or sodium hydroxide as a base and copper chloride as a catalyst in an aprotogenic solvent, either dimethylsulphoxide (DMSO) or sulfolane. The sulfolane/NaOH system at higher temperature led to more rapid polymerization, and a relative high molecular weight. The degrees of branching of these HPPOs from the DMSO/K2CO3 and sulfolane/NaOH systems were 71 and 48%, respectively, as determined by 1H NMR integration experiments. The phenolic terminal groups underwent facile modification, furnishing hyperbranched polymers with a variety of functional chain ends. The nature of the chain-end groups had a significant influence on the solubility of the hyperbranched poly(phenylene oxide)s. The resulting polymers were characterized by NMR, Fourier transform infrared, gel permeation chromatography (GPC), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). |
| |
Keywords: | Hyperbranched poly(phenylene oxide) Synthesis Modification |
本文献已被 ScienceDirect 等数据库收录! |
|