含不对称茚满结构聚酰亚胺的合成与表征

Synthesis and Characterization of Polyimides with Asymmetric Indane Structure

以双酚A为原料,通过有机合成制备含不对称茚满结构的二胺单体6-(4-氨基-2-三氟甲基)苯氧基-1-[4-(4-氨基-2-三氟甲基)苯氧基]苯基-1,3,3,-三甲基茚满,并与5种二酐通过化学亚胺化法制备含茚满结构聚酰亚胺。通过红外光谱、核磁共振、溶解性能测试、紫外可见光谱、差示扫描量热分析、热重分析等对聚合物进行测试。结果表明,该系列聚酰亚胺室温下在低沸点溶剂如CHCl3,CH2Cl2,THF,丙酮等中也表现出非常优异的溶解性能;在450~760 nm范围内具有优异的光学性能,550 nm处透光率高达88.1%;玻璃化转变温度在228~265℃,5%热失重温度(N2氛围)在484~520℃,具有良好的热性能;拉伸强度为75.8~92.5 MPa,弹性模量为1.3~2.0 GPa,断裂伸长率为3.2%~10.8%,表现出良好的力学性能。

The diamine monomer 6-(4-amino-2-trifluoromethyl)phenoxy-1-[4-(4-amino-2-trifluoromethyl)phenoxy]phenyl-1,3,3-trimethyl indene containing asymmetric indane structure was synthesized with bisphenol A.A series of polyimides containing indane structure were prepared with five commercial aromatic dianhydrides via chemical imidization.The structures of the monomer and polymers were confirmed by FT-IR and NMR,and the properties of these polymers were characterized by solubility testing,UV-vis,DSC,TGA,etc.The results show that these polyimides have excellent solubility even in low boiling solvents such as CHCl3,CH2Cl2,THF and acetone.The films show excellent optical properties in the range of 450 nm to 760 nm,and the transmittance at 550 nm is up to 88.1%.These polyimides display good thermal properties,their glass transition temperature ranges from 228℃to 265℃and 5%mass loss temperature is up to 484~520℃.The films also show good mechanical properties,and the tensile strength,elastic modulus and elongation at break are in the range of 75.8~92.5 MPa,1.3~2.0 GPa,3.2%~10.8%,respectively.