Synthesis and Investigation of Transition Metal Removing of Novel Thermally Stable Polyamides bearing Calix[4]arene in their Backbones

Abstract

A series of polyamides having calix[4]arene units in the backbone which are called polycalixamides were prepared by direct polycondensation of dicarboxylic acid derivative of calix[4]arene with commercial diamines. The polycalixamides were obtained in high yields and possessed inherent viscosities of 0.42–0.55 dl/g and glass transition temperatures between 145 and 172°C. These polycalixamides were amorphous and therefore readily soluble in polar aprotic solvents such as NMP, DMSO, DMAc and THF. According to thermogravimetric analysis, these polymer series displayed high thermal stability ranged from 330 to 353°C at the point of 10% weight loss and char yields between 40.7–58% at 700°C in nitrogen. The temperature of maximum decomposition applied in DTG curves of polymers were among 326 to 369°C. The photophysical study was performed by UV-absorption spectroscopy and maximum wavelength for each polymer specified in details. It is found that these polyamides were highly efficient for sorption of Cu2+, Cr2+, Co2+ and Cd2+ in solid-liquid extraction.