C-N/C-O偶联反应三元共聚构筑可溶性N–取代聚苯并咪唑酰亚胺砜

Soluble N-substituted poly(benzimidazole imide sulfone) synthesized by ternary copolymerization via C—N/C—O coupling reaction

以4,4′–二羟基二苯砜为第三单体,与1,4–双（2–苯并咪唑基）苯单体和双（4–氟邻苯二甲酰亚胺–N–苯基）醚通过C—N/C—O偶联反应,成功获得了系列组分不同的N–取代聚苯并咪唑酰亚胺砜（PBIIS）。通过傅里叶变换红外（FT–IR）、元素分析和核磁共振（NMR）对所合成的聚合物进行了表征,表征结果与目标聚合物吻合良好。热重测试结果表明,所制备的聚合物具有良好的热稳定性,质量损失5%时的温度在500℃左右。基于其独特的分子链结构,N–取代PBIIS具有良好的溶解性能,室温下可溶于N,N–二甲基乙酰胺（DMAc）、N–甲基吡咯烷酮（NMP）、N,N–二甲基甲酰胺（DMF）和二甲基亚砜（DMSO）等溶剂中。通过浇铸法制备N–取代PBIIS薄膜,其具有优良的透光性能。另外,N–取代PBIIS表现出优异的力学性能,其断裂伸长率为2.7%~6.1%,最大拉伸强度可达74.8 MPa。

A series of N-substituted poly（benzimidazole imide sulfone）s （PBIIS） with different constituents were successfully obtained by using 4,4＇-dihydroxyl dipheuyl sulfone as the third monomer and through the C--N/C--O coupling reaction of it with 1,4-bis（2-benzimidazolyl） benzene monomer and bis（4-fluoro phthalimido-N-phenyl） ether. The prepared polymers were characterized by using Fourier translation infrared （FT-IR）, elemental analysis and nuclear magnetic resonance （NMR）. The characterization results are in good agreement with the target polymer. The thermogravimetry test results show that the prepared polymer possesses good thermal stability. The temperature in case of 5% mass loss is about 500 ~C. Due to its unique molecular chain structure, the N-substituted PBIIS possesses good solubility and is soluble in such solvents as N,N-dimethylacetamide （DMAc）, N-methyl pyrrolidone （NMP）, N,N- dimethylformamide （DMF）, dimethyl sulfoxide （DMSO） and so on. The N-substituted PBIIS thin film was prepared by using the casting method, and it possesses excellent light transmission performance. In addition, the N-substituted PBIlS exhibits excellent mechanical performance, its elongation at break is 2.7%-6.1%, the maximum tensile strength can reach 74.8 MPa.