摘要
选用医用级热塑性聚氨酯(TPU)为原材料,在旋转流变仪和毛细管流变仪上对TPU进行稳态、动态流变测试。采用Power Law方程进行流变数据拟合,得到200℃时TPU零切黏度为855 Pa·s,非牛顿指数为0.65,松弛时间为0.06 s。利用时温等效原理对动态流变数据进行主曲线滑移拟合,通过阿伦尼乌斯方程求得黏流活化能(ΔE)为137 k J/mol。流变测试结果表明,TPU是一种温敏性较强的材料,准确选择并控制TPU的加工条件十分重要。
A kind of medical grade thermoplastic polyurethane （TPU） was selected as research material to test rheological properties of TPU. Rotational rheometer and high pressure capillary rheometer were used to measured the stable flow viscosity and dynamic viscosity. The master curves can be well described by the Power-Law model, by which the obtained zero shear viscosity is 855 Pa＇s, non-Newtonian index is 0.65 and the relaxation time is 0.06 s at 200℃. Shift factors derived from time-temperature superposition show good fit to the Arrhenius equation with a flow activation energy of almost 137 kJ/mol. The results show that TPU is a kind of polymer material that possess a strong temperature sensitivity to apparent viscosity, and TPU processing conditions such as heating temperature and share rate should be controlled precisely during extrusion.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2016年第12期87-90,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21464010)
江西省重点研发计划(20161BBG70 046)
关键词
聚氨酯
医用材料
流变性能
粘流活化能
thermoplastic polyurethane
medical grade polymer
rheological property
flow activation energy
