以聚醚胺为单体的超支化聚酰亚胺的制备与表征

以聚醚胺(T-403)、4,4′-二氨基二苯醚(ODA)和3,3′,4,4′-二苯甲酮二酐(BTDA)为单体,采用A2+B3法通过热亚胺化和化学亚胺化得到一系列超支化聚酰亚胺(HBPIs)。通过红外光谱测试(FT-IR)、热重分析测试(TGA)、溶解性测试和X射线衍射分析(XRD)对聚合物进行了结构表征和性能测试。FT-IR表明生成了预期的聚合物;TGA表明合成的超支化共聚PI随着共聚体系中芳香二胺的比例增大,其在N2中5%和10%的热失重温度也随之升高;溶解性测试表明合成的超支化聚酰胺酸具有较好的溶解性,化学亚胺化合成的HBPI溶解性良好;X射线衍射分析(XRD)表明聚合物的结晶度较低。

The Preparation and Characterization of Hyper-Branched Polyimides Based on Polyetheramine

A series of hyper-branched polyimides were synthesized via A2+B3 approach using 3,3′,4,4′-benzophenone tetracarboxylic dianhydride(BTDA) and 4,4′-diaminodiphenyl ether(ODA) and poly(oxyalkylene) triamine(T-403) as materials.The structure and properties of the products were characterized by Fourier transform infrared spectroscopy(FT-IR),thermal gravimetric analysis(TGA),X-ray diffraction(XRD) and solubility test.The chemical structure of hyper-branched copolyimides was confirmed by FT-IR spectra.The thermogravimetric curve indicates that PI′s 5% or 10% thermal decomposition temperature in N2 increases as the proportion of ODA increases;the solubility test shows that the obtained hyper-branched poly(amic acid)s and the polyimide obtained by chemical imidization are soluble in several polar aprotic solvents.XRD spectrum demonstrates that the polymers have low-order aggregation structure.