KCS

Monomer reactivity ratios were investigated in the copolymerization of 2-pyrrolidone and ε-caprolactam. Experiment was performed in the temperature range of 60~90℃. 2-Pyrrolidone with ε-caprolactam copolymer was synthesized by anionic ring-opening polymerization and the mole fraction in the copolymer was obtained by H-NMR. The potassium tert-butoxide was used as an initiator and the N-acetylcaprolactam was used as the activation reagent. According to the obtained reactivity ratio, it is determined that it has the value of the r1≒r2≒1 in 75~80℃ and the copolymer composition is the same as the comonomer feed with random placement of the two monomers along the copolymer chain.