The Effect of Crystallinity on the Rheological Behavior of Poly(lactide)
The Effect of Crystallinity on the Rheological Behavior of Poly(lactide)
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DOI：
10.1080/10236669808009725
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发表时间：
1998
影响因子：
1.9
通讯作者：
Jinlin Wang;R. T. Kean;J. Randall;D. Giles
中科院分区：
文献类型：
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作者：
Jinlin Wang;R. T. Kean;J. Randall;D. Giles
摘要 研究了不同结晶度聚丙交酯样品的流变行为。动态剪切储能模量和损耗模量是在 1 rad/s 下作为温度的函数获得的。从玻璃态到橡胶态区域，最初的无定形聚丙交酯（含有 1% D-丙交酯）的动态剪切模量下降了二十多年，而退火（半晶系）样品的动态剪切模量下降了约十年。动态剪切模量数据表明，结晶速率随着聚丙交酯中D-丙交酯的减少和样品中滑石粉（成核剂）的增加而增加。稳态和动态剪切粘度在 210°C 下测量。结果表明，Cox-Merz 规则可用于将动态剪切粘度与稳态剪切粘度联系起来。利用时间-温度叠加原理获得了无定形聚丙交酯的主曲线。结果表明，位移因子与温度的关系...
Abstract The rheological behavior of poly(lactide) samples, with different levels of crystallinity, was investigated. The dynamic shear storage and loss modulus were obtained as a function of temperature at 1 rad/s. From the glassy to the rubbery region, the dynamic shear modulus decreased more than two decades for the initially amorphous poly(lac-tide) (containing 1% of D-lactide) and about one decade for the annealed (semicrystaJ-line) sample. The dynamic shear modulus data showed that the crystallization rate increased with a decrease of D-lactide in poly(lactide) and an increase of talc (a nucleating agent) in the sample. The steady-state and dynamic shear viscosity were measured at 210°C. The results indicated that the Cox-Merz rule can be used to relate the dynamic shear viscosity to the steady-state shear viscosity. A master curve for the amorphous poly(lactide) was obtained, using the time-temperature superposition principle. The result showed that the temperature dependence of the shift factor ca...