主链含N-烷基咔唑环结构聚芳醚酮的性能表征

对含N-烷基咔唑环结构的聚芳醚酮(PPCzE、PPCzB和PPCzH)进行基本物理性能方面的表征,并与商业化酚酞基聚芳醚酮(PEK-C)进行比较。 咔唑环结构的引入使聚合物在345 nm附近有强紫外光吸收并表现出发蓝光能力。 由于疏水性烷基侧链的存在,聚合物薄膜的水接触角(87°~103°)大于PEK-C(76°),但同时烷基侧链所引起的聚合物链间距的增大导致聚合物的吸水率(0.65%~0.86%)高于PEK-C(0.56%)。 此外,聚合物表现出较好的尺寸稳定性(平均线膨胀系数6.4×10^-5 ℃^-1)和电绝缘性能(体积电阻率10¹⁶ Ω·cm)。 聚合物的拉伸模量在1.9~2.0 GPa之间,拉伸强度在72.5~75.0 MPa之间以及断裂伸长率在6.5%~7.2%之间。 高温条件下(≤225 ℃),PPCzE仍具有良好的拉伸性能。

Properties of Poly(arylene ether ketone)s Containing N-Alkylcarbazole in Main Chains

Several basic physical properties of poly(arylene ether ketone)s containing N-alkylcarbazole(PPCzE, PPCzB and PPCzH) were studied in comparison with the corresponding analog, commercialized phenolphthalein poly(ether ketone)(PEK-C). Strong UV absorption and blue light emission ability are exhibited by these polymers due to the introduction of carbazole structure. The water contact angle of polymers(87°~103°) is greater than that of PEK-C(76°), because of the hydrophobic nature of alkyl groups. While at the same time, these polymers have higher water uptake capabilities than PEK-C which is probably due to their larger chain distance. In addition, these polymers exhibit good dimensional stability(linear thermal expansion coefficient 6.4×10^-5 ℃^-1) and electrical insulating(volume resistivity 10¹⁶ Ω·cm) property. Young's modulus, tensile strength and elongation at break of these polymers are in the range of 1.9~2.0 GPa, 72.5~75.0 MP and 6.5%~7.2%, respectively. Dynamic mechanical analysis shows that PPCzE remains good tensile property at the temperature up to 225 ℃.