Mechanical characterization and modeling stress relaxation behavior of acrylic–polyurethane‐based graft‐interpenetrating polymer networks,Polymer Engineering and Science

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Mechanical characterization and modeling stress relaxation behavior of acrylic–polyurethane‐based graft‐interpenetrating polymer networks
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-01-27 , DOI: 10.1002/pen.25640
Nima Alizadeh _{1,

2} , Asha‐Dee N. Celestine ₃ , Maria L. Auad _{1,

2} , Vinamra Agrawal ₃

Affiliation

The stress relaxation behavior of acrylic–polyurethane (PU)‐based graft‐interpenetrating polymer networks (IPNs) was characterized via dynamic mechanical analysis (DMA) and modeled using finite element method (FEM) analysis. Stress relaxation of glassy IPN specimens was experimentally studied under flexural testing, while rubbery IPN specimens were tested in tension. The effects of varying the styrene content in the acrylic copolymer phase, compatibility of the two phases in IPNs, and changing the concentration of acrylic copolymer and PU were studied. A higher percentage of styrene content resulted in higher homogeneity of IPN specimens, and decrease in initial modulus for acrylic copolymer specimens. Additionally, glassy IPN specimens with 90% styrene shows resistance to relaxation as high as acrylic copolymer samples. Experimental results were used to develop a numerical model to study stress relaxation response of specimens. While polymer systems have been studied computationally, numerical modeling of IPN systems is still in its infancy. A three‐dimensional FEM model was developed using the Generalized Maxwell model and four‐term Prony series constants, which were extracted from the stress relaxation experiments. With four terms in the Prony series, a good match was observed between experimental observations and results from the FEM model.

中文翻译：

丙烯酸-聚氨酯基接枝互穿聚合物网络的力学表征和应力松弛行为建模

通过动态力学分析（DMA）对丙烯酸-聚氨酯（PU）基接枝互穿聚合物网络（IPNs）的应力松弛行为进行了表征，并使用有限元方法（FEM）分析对其进行了建模。玻璃态IPN样品的应力松弛在弯曲测试下进行了实验研究，而橡胶状IPN样品则进行了拉伸测试。研究了改变丙烯酸共聚物相中苯乙烯含量，两相在IPN中的相容性以及改变丙烯酸共聚物和PU浓度的影响。较高百分比的苯乙烯含量会导致IPN标本具有更高的均质性，并降低丙烯酸共聚物标本的初始模量。此外，具有90％苯乙烯的玻璃状IPN样品显示出与丙烯酸共聚物样品一样高的抗松弛性。实验结果被用来建立一个数值模型来研究试样的应力松弛响应。尽管已经对聚合物系统进行了计算研究，但IPN系统的数值建模仍处于起步阶段。使用广义麦克斯韦模型和四项Prony系列常数开发了三维有限元模型，这些模型是从应力松弛实验中提取的。在Prony系列中使用四个术语，可以观察到实验观察结果与FEM模型结果之间的良好匹配。这些是从应力松弛实验中提取的。在Prony系列中使用四个术语，可以观察到实验观察结果与FEM模型结果之间的良好匹配。这些是从应力松弛实验中提取的。在Prony系列中使用四个术语，可以观察到实验观察结果与FEM模型结果之间的良好匹配。

更新日期：2021-01-27

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