| 聚苯乙烯-聚异戊二烯-聚苯乙烯热塑性弹性体的非牛顿指数研究 |
| Study on Non-Newtonian Index of SIS Thermoplastic Elastomers |
| 投稿时间：2023-04-13 修订日期：2023-04-13 |
| DOI：10.12136/j.issn.1000-890X.2025.04.0243 |
| 中文关键词: 聚苯乙烯-聚异戊二烯-聚苯乙烯热塑性弹性体 非牛顿指数 幂律方程 流动曲线 剪切黏度 拉伸黏度 |
| 英文关键词: SIS thermoplastic elastomer non Newtonian index power-law equation flow curve shear viscosity tensile viscosity |
| 基金项目:山东省自然科学基金资助项目(ZR2022ME142) |
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| 中文摘要: |
| 基于非牛顿流体幂律方程，用双料筒毛细管流变仪研究了两种聚苯乙烯相含量（15%和29%）的聚苯乙烯-聚异戊二烯-聚苯乙烯（SIS）热塑性弹性体的流动曲线，采取不同拟合方式求取非牛顿指数（n），并通过偏差分析确定n的准确性。结果表明：SIS热塑性弹性体的流动曲线需依据黏流转变温度（Tf）进行不同方式拟合，在温度低于Tf时可采用分段一次拟合的方式求取n，温度在Tf附近时可采用分段二次拟合方式求取n，温度高于Tf时可采用整体二次拟合方式求取n；采用分段拟合方式求取的n对SIS热塑性弹性体的剪切黏度和拉伸黏度影响较大；SIS热塑性弹性体和聚乙烯两种不同类型的聚合物的流动曲线采用分段拟合求取n具有普适性。 |
| 英文摘要: |
| 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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