PA5T-56低温溶液/固相聚合的制备与表征OA北大核心

There are numerous methods for synthesizing semi-aromatic polyamides,among which the low-temperature solution polymerization method provides mild conditions and is easy to control.Polyp-phenyl-glutarylenediamide(PA5T-56)with a series of component ratios were prepared using bio-based pentanediamine,adipyl chloride and terephthalyl chloride by low temperature solution polymerization and solid phase polymerization.The effects of solid-phase polymerization temperature and time on solid-phase polymerization are discussed in terms of the relative viscosities of the polymerization products.Then the chemical structure and thermal properties of PA5T-56/L were studied.The results showed that with the increase of solid phase polymerization temperature and time during solid phase polymerization,the relative viscosity of low temperature polymerization products of PA5T-56/L could be increased,but when the temperature exceeds 240℃ and the reaction time exceeded 8 h,the relative viscosity decreased.The initial decomposition temperature and temperature of maximum decomposition rate of series of components PA5T-56/L obtained by low temperature solution polymerization were higher than 389.8,463.5℃.The solid-phase polymerization could increase its melting temperature and crystallization temperature by nearly 20℃ when the mole fraction of terephthaloyl pentamethylene diamine segment(5T)was higher than 70％,which was higher than 290.1,240.3℃,respectively.