摘要
采用自行研制的动态毛细管流变仪,研究了正弦脉动挤出流场对聚对苯二甲酸乙二酯(PET)结晶行为的影响。正弦脉动挤出后的PET用冰水骤冷,得到无明显结晶的PET样品,通过DSC非等温结晶动力学测试,分析了振频和振幅与PET结晶过程的关系。实验数据显示:PET的等速升温DSC曲线出现双重结晶峰;固定振动频率,低温峰结晶焓百分比随着振动幅度的增大而逐渐增大,由12．6％(稳态)上升到60．7％(12Hz时)和35．5％(6 Hz时); 固定振动幅度(0．3mm),随着振动频率的增加,低温峰结晶焓百分比上升到64．0％(18 Hz),且低温峰向低温方向靠近;总结晶度基本保持不变。
The self-made capillary dynamic rheometer was adopted to study the relationship between the crystallization behavior of poly（ethylene terephthalate）（PET） and the different vibration conditions in the sine pulsating flow field. The crystalline structure changes of PET quenched in ice-water under different vibration conditions were characterized by using differential scanning calorimetry（DSC）. It was found that the thermograms of PET under steady calefaction show double crystallization endotherms; while vibration frequency is constant, with vibration amplitude increasing, the low temperature endotherm＇s percentage of enthalpy of crystallization rises from 12.6 % （0 Hz） to 60.7 % （12 Hz） and 35.5 % （6 Hz）; when vibration amplitude is 0.3 mm, with the increase of vibration frequency, the low temperature endotherm＇s percentage of enthalpy of crystallization rises to 64.0 % （18 Hz）, and low temperature exotherm shifts to lower temperature; the total crystallization degree keeps steady.
出处
《中国塑料》
CAS
CSCD
北大核心
2006年第1期57-60,共4页
China Plastics
基金
国家自然科学基金面上项目(10472034)国家自然科学基金重大项目(10590351)
关键词
聚对苯二甲酸乙二酯
动态毛细管流变仪
正弦脉动流场
结晶双峰
poly（ethylene terephthalate）
dynamic capillary rheometer
sine pulsating flow field
double crystallization endotherm
