聚砜酰胺酸和聚砜酰亚胺的微波辐射合成

Synthesis of Polyamic Acid Sulfone and Polyimide Sulfone by Microwave Irradiation

采用4, 4-二氨基二苯砜(DDS)与均苯四酸二酐(PMDA)为单体进行微波辐射溶液聚合反应,所得的聚酰胺酸进行固相微波辐射亚酰化。考察了微波辐射时间、反应温度、单体浓度、单体配比等因素对聚合物的特性粘数、转化率的影响,并与热聚合进行比较,用红外及核磁共振的测试方法对聚合物的结构进行了表征,通过红外光谱表征了聚酰亚胺的亚酰化度。实验结果表明:微波辐射不仅能缩短缩聚反应时间,还能提高缩聚物的特性粘数和转化率。固相微波辐射使聚酰胺酸的亚酰化时间缩短,亚酰化度增大。合成的聚酰胺酸和聚酰亚胺都具有一定的荧光性能, 聚酰亚胺具有一定的磁性。

The polycondensation of the 4,4-diaminodiphenyl sulfone and pyromellitic dianhydride was studied under microwave irradiation, and the resulted polyamic acid sulfone was imidized in solid phase by using microwave irradiation. Meanwhile, the effects of the microwave irradiation time, the reaction temperature, the concentration of monomers, and the monomers ratio on the intrinsic viscosity and the conversion were investigated. At the same time, the comparison of microwave irradiation polymerization with the relevant conventional thermopolymerization was made. The polymerisates were determined by Fourier transform infrared absorption spectrum (FTIR) and nuclear magnetic resonance spectrometry (NMR). The imidization degree of polyimide sulfone was measured by infrared absorption spectrum. The results showed that under microwave irradiation, not only the time of polycondensation was shortened, but also the intrinsic viscosity and the conversion of the polycondensate were raised. The imidization time of the polyamic acid sulfone is reduced and the degree of imidization is promoted when the resulted polyamic acid sulfone is imidized in solid phase by using microwave irradiation. What is more, both the polyamic acid sulfone and the polyimide sulfone have fluorescent property. And that the polyimide sulfone has magnetic property.