The kinetics of mesophase formation of a lyotropic aromatic polyamide from isotropic state has been studied by means of depolarized light intensity. Avrami type analysis of the data gives an exponent close to 1, which...The kinetics of mesophase formation of a lyotropic aromatic polyamide from isotropic state has been studied by means of depolarized light intensity. Avrami type analysis of the data gives an exponent close to 1, which suggests the nucleation followed by one-dimensional growth. No influence of blending flexible chain from nylon 6 to the aromatic polyamide on the kinetics of mesophase formation was observed.展开更多
聚合反应过程的热量管理是影响聚合物品质以及工程放大成败的关键因素之一.本文通过在PPTA聚合过程中引入液氮,考察了PPTA在传统低温溶液缩聚法制备过程中,采用惰性传热介质液氮作为辅助移热介质时,对PPTA聚合过程及聚合物性能的影响....聚合反应过程的热量管理是影响聚合物品质以及工程放大成败的关键因素之一.本文通过在PPTA聚合过程中引入液氮,考察了PPTA在传统低温溶液缩聚法制备过程中,采用惰性传热介质液氮作为辅助移热介质时,对PPTA聚合过程及聚合物性能的影响.结果表明,在PPTA聚合过程中适量液氮的加入可提高其比浓对数黏度和热稳定性,改善PPTA的表面浸润性能,并且未对PPTA的化学结构、聚集态结构及液晶形态产生明显影响.在140,300及1000 L反应釜的聚合放大实验中所得聚合物的比浓对数黏度均在6 d L/g以上.展开更多
基金This work was supported by Academia Sinica selected Research Program and National Natural Science Foundation of China
文摘The kinetics of mesophase formation of a lyotropic aromatic polyamide from isotropic state has been studied by means of depolarized light intensity. Avrami type analysis of the data gives an exponent close to 1, which suggests the nucleation followed by one-dimensional growth. No influence of blending flexible chain from nylon 6 to the aromatic polyamide on the kinetics of mesophase formation was observed.
文摘聚合反应过程的热量管理是影响聚合物品质以及工程放大成败的关键因素之一.本文通过在PPTA聚合过程中引入液氮,考察了PPTA在传统低温溶液缩聚法制备过程中,采用惰性传热介质液氮作为辅助移热介质时,对PPTA聚合过程及聚合物性能的影响.结果表明,在PPTA聚合过程中适量液氮的加入可提高其比浓对数黏度和热稳定性,改善PPTA的表面浸润性能,并且未对PPTA的化学结构、聚集态结构及液晶形态产生明显影响.在140,300及1000 L反应釜的聚合放大实验中所得聚合物的比浓对数黏度均在6 d L/g以上.
