摘要
运用差示扫描量热仪研究了不同特性粘数（0．55～0．70dL／g）的PET非等温冷结晶和熔融结晶过程。结果表明，随着特性粘数降低，PET样品消除热历史后的冷结晶起始温度θ0和峰温θ0向低温区偏移，半结晶时间t1/2延长，特性粘数在0．617dL／g以下，易形成完善的大尺寸结晶；PET熔融结晶温度呈上升趋势，熔融结晶t1/2降低，结晶速率增加，当特性粘数大于0．657dL／g时，t1/2和Avrami指数n明显增加，不利于拉膜时铸片的均匀性。
The non-isothermal crystallization kinetics in cooling and melting crystallization of polyethylene terephthalate (PET)with different instinct viscous (0.55 ~0.70 dL /g)were studied by differential scanning calo-rimeter.The results showed that with the instinct viscous decreased,the temperature corresponding to cooling crys-tallization exothermic onset θo and peak θp decreased,the half-crystallization time t1 /2 was increased.When IV less than 0.61 7 dL /g,it was easy to form big size crystallization during cooling crystallization.With the instinct viscous decreased,the melt crystallization temperature of PET increased,the half-crystallization time t1 /2 decreased and the crystallization rate enhanced.When IV more than 0.657 dL /g,t1 /2 and Avrami index n increased obviously,and it was bad for producing film.
出处
《合成技术及应用》
2015年第2期1-4,共4页
Synthetic Technology & Application
关键词
特性粘数
聚对苯二甲酸乙二醇酯
非等温结晶
差示扫描量热仪
intrinsic viscous
polyethylene terephthalate
non-isothermal crystallization
differential scanning calorimeter
