Abstract
An ionic liquid (IL) (1,3-dipropylimidazolium bromide) in combination with triphenyl phosphite was employed for the synthesis of highly organosoluble and chiral polyamides bearing l-phenylalanine and anthracenic units via the phosphorylation polyamidation reaction with the assistance of a microwave-accelerated reaction system. Compared with conventional solvents, this approach exhibited higher inherent viscosities and shorter reaction time, which indicated coupling of IL and microwave irradiation was an efficient, rapid, and simple preparation technique for the synthesis of polyamides. The yields and thermal stability of the polymers were comparative under two methods. All of the resulting polymers were amorphous with excellent solubility in many organic solvents, such as N-methyl-2-pyrrolidinone and N,N-dimethylacetamide. The obtained polyamides had glass transition temperatures of about 183 °C, 10% weight-loss temperatures in excess of 340 °C, and char yields at 800 °C in nitrogen higher than 42%.