摘要
Phase transition behavior and influence of ions on the thermo-sensitive polyamide with polyethylene glycol as the main chain were studied in detail. By measuring the light transmission rates of polymer solutions, the change of its lower critical solution temperature （LCST） in the salt solution was investigated. It was found that a reversible phase transition of the polyamide occurred at the LCST and finished in a narrow temperature range. The LCST was associated with species of ions in salt solution. Anions had a great impact on the phase transition performance of the thermo-sensitive polyamide, while the cations had a slight influence on the phase transition. Different anions had different coagulation ability to ‘salt-out＇ the polyamide. The order was： CO2-3〉SiO2-3〉HPO2-4〉OH-〉Cl-〉HCO3-〉HSOa-〉NO2-〉NO3-.
Phase transition behavior and influence of ions on the thermo-sensitive polyamide with polyethylene glycol as the main chain were studied in detail. By measuring the light transmission rates of polymer solutions, the change of its lower critical solution temperature （LCST） in the salt solution was investigated. It was found that a reversible phase transition of the polyamide occurred at the LCST and finished in a narrow temperature range. The LCST was associated with species of ions in salt solution. Anions had a great impact on the phase transition performance of the thermo-sensitive polyamide, while the cations had a slight influence on the phase transition. Different anions had different coagulation ability to ‘salt-out＇ the polyamide. The order was： CO2-3〉SiO2-3〉HPO2-4〉OH-〉Cl-〉HCO3-〉HSOa-〉NO2-〉NO3-.
基金
Funded by the Major Special Science and Technology Project of Hainan Province (No.ZDZX20100009)
