复合成盐剂对聚醚醚酮合成与性能的影响

采用4,4′-二氟二苯甲酮、对苯二酚为原料,以不同比例的碳酸钾和碳酸钠为复合成盐剂,二甲苯为脱水剂,二苯砜为溶剂成功制备了一系列聚醚醚酮(PEEK)树脂。通过傅里叶红外光谱和X射线衍射对PEEK树脂结构进行了表征,证明合成的样品是对苯二酚型PEEK树脂。其次,对所制样品分别进行力学性能、特性黏度、热性能测试,详细地探讨不同钾/钠比例的复合成盐剂对PEEK性能的影响。结果表明,所有样品均展示了优异的力学性能和热性能,其熔点和初始分解温度分别大于330℃和520℃,拉伸强度介于77~101 MPa。此外,当碳酸钾和碳酸钠的物质的量比为7∶3时,PEEK树脂的综合性能达到最优。

Effect of Compound Salt Forming Agent on Synthesis and Properties of Poly(ether ether ketone)

Taking 4,4′-difluoro diphenylmethanone and hydroquinone as raw material,different proportions of potassium carbonate and sodium carbonate as salt forming agent,dimethylbenzene as dehydrating agent and phenyl sulfone as solvent,a series of poly(ether ether ketone)(PEEK)resins were synthesized via nucleophilic substitution polycondensation reactions.The structure and properties of the PEEK resins were characterized by fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD),which indicated that the synthesized polymer was hydroquinone PEEK.In addition,the mechanical properties,intrinsic viscosity and thermal properties of PEEK resins were investigated,and the effects of compound salt forming agent on properties of PEEK were also discussed.The results indicates that the synthesized PEEK resins show excellent mechanical properties and high thermal stability.The melting point(T m)and initial thermal decomposition temperature(T id)are higher than 330℃ and 520℃,while the tensile strength is 77~101 MPa.Moreover,PEEK shows the best comprehensive performance when the ratio of potassium carbonate to sodium carbonate is 7∶3.