| Study on Non-Newtonian Index of SIS Thermoplastic Elastomers |
| Received:April 13, 2023 Revised:April 13, 2023 |
| DOI：10.12136/j.issn.1000-890X.2025.04.0243 |
| Key Words: SIS thermoplastic elastomer；non Newtonian index；power-law equation；flow curve；shear viscosity；tensile viscosity |
| Author Name | Affiliation | E-mail | | JIA Tingting | Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science and Technology | jiatingjtt@163.com | | GAO Qingqing | Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science and Technology | | | SHANG Zihao | Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science and Technology | | | TAO Yong | Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science and Technology | | | HU Haiqing* | Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science and Technology | hhq@qust.edu.cn |
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| Abstract: |
| Based on the non Newtonian fluid power-law equation，the flow curves of polystyrene polyisoprene polystyrene（SIS） thermoplastic elastomers with two types of polystyrene phase contents （15% and 29%） were studied using a dual tube capillary rheometer，the non Newtonian index（n） was obtained by different fitting methods，and the accuracy of the n was determined through deviation analysis.The results indicated that，the flow curves of SIS thermoplastic elastomers need to be fitted in different ways based on the viscous flow transition temperature（Tf），the n could be obtained by the segmented first order fitting method at the temperature bleow Tf，the n could be obtained by the segmented second order fitting method at the temperature near Tf，and the n could be obtained by the global second order fitting method at the temperatures above Tf.The n obtained by the segmented fitting method had a significant impact on the shear viscosity and the tensile viscosity of SIS thermoplastic elastomer.The segmented fitting method to obtain the n for the flow curves of two different types of polymers SIS thermoplastic elastomer and polyethylene was universal. |
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