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热反应性Pluronic F127水凝的温度依赖的屈服应力和墙壁滑动行为

Surya Narayana Sangitra¹, Ravi Kumar Pujala¹

¹Soft and Active Matter Group, Department of Physics and Center for Atomic, Molecular and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research (IISER) Tirupati Yerpedu Tirupati 517619 Andhra Pradesh India pujalaravikumar@iisertirupati.ac.in.

|July 30, 2024

概括

这项研究调查了Pluronic F127在sol-gel过渡期间的动态产量应力. 根据博尔茨曼方程,收益应力随着温度的增加而增加,修改后的模型解释了墙壁滑动效应.

科学领域:

材料科学材料科学材料科学
聚合物科学聚合物科学
类风病学类风病学类风病学

背景情况:

热敏聚合物表现出温度依赖的相变.
普鲁罗尼克F127 (PF127) 是一种正在经历sol-gel过渡的triblock共聚物.
收益应力是描述材料流动行为的关键参数.

研究的目的:

为了确定PF127.7.的温度依赖的动态屈服应力.
为了调查和纠正明显的墙壁滑动在风湿学测量期间.
开发一个修改后的模型来准确地确定收益率应力.

主要方法:

使用各种几何形状的风病学测量.
赫歇尔-布克利 (HB) 和宾汉模型的应用.
使用穆尼方法和修改后的Windhab模型,具有滑动边界条件.

主要成果:

观察到明显的墙壁滑动,使传统的产量应力测量变得复杂.
一个经过修改的HB-Windhab模型成功计算了对滑动进行校正的真实收益应力.
PF127的产应力随着温度的增加而增加,并遵循博尔兹曼方程.

结论:

精确的动态屈服应力测定需要考虑墙壁滑动.
修改后的模型提供了一种更可靠的方法来描述PF127的风湿性质.
PF127的温度依赖的产应应力行为与其他热敏聚合物不同.

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