Citation: Dong-Lei Liu, Feng Zhou, Kun Fang. A Theoretical Study on Transitional Shear Flow Behavior of the Compressible and Isothermal Thermoplastic Polymer[J]. Chinese Journal of Polymer Science, ;2019, 37(5): 518-526. doi: 10.1007/s10118-019-2214-3 shu

A Theoretical Study on Transitional Shear Flow Behavior of the Compressible and Isothermal Thermoplastic Polymer

Dong-Lei Liu ^1,2,, ,
Feng Zhou ^1,2 ,
Kun Fang ^1,2

a.
College of Mechanical and Electrical Engineering, Nanchang University, Jiangxi 330031, China
b.
Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province, Nanchang University, Jiangxi 330031, China

Corresponding author: Dong-Lei Liu,
Received Date: 29 September 2018
Revised Date: 16 December 2018
Available Online: 29 January 2019

By extending the virtual conformational element of the polymer chain, a dynamic end-to-end (ETE) vector was presented to describe the chain’s instantaneous morphology based on the spring-bead theory. A feasible viscoelastic model was proposed to describe the rheological behavior of the isothermal thermoplastic polymer materials, based on the molecular kinetics, thermodynamics, and continuum mechanics method. The model is simplified as the generalized Newton’s law. Its integral formula with similar form to the K-BKZ model was also derived. Rheological experiments were carried out with the isotactic polypropylene material. The experimental results reveal that the viscoelastic model exhibits a three-stage rheological characteristic. There is a distinct high-elastic rheological region in the middle stage, reflecting the pseudoplastic fluids properties. Compared with the Ostwald-de Waele power law model, the viscoelastic model shows a better agreement with the rheological practices.
- Shear flow,
- Theoretical model,
- Thermoplastic polymer,
- Rheological experiments
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