Enhancing Mechanical Properties of Sustainable Thermoplastic Elastomers through Incorporating Ionic Interactions,Macromolecules

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Enhancing Mechanical Properties of Sustainable Thermoplastic Elastomers through Incorporating Ionic Interactions
Macromolecules ( IF 5.1 ) Pub Date : 2024-08-26 , DOI: 10.1021/acs.macromol.4c01387
Wenyue Ding ₁ , Josiah Hanson ₁ , Yi Shi ₂ , Yan Yao ₂ , Megan L. Robertson _{1,

3}

Affiliation

The physical properties of an ABA triblock copolymer-based thermoplastic elastomer, containing a poly(lauryl methacrylate-co-methacrylic acid) midblock and poly(methyl methacrylate) endblocks, were enhanced through neutralization of the methacrylic acid (MAA) repeat units with NaOH to form ionic interactions in the midblock. Rheological properties of the midblock and mechanical properties of the triblock copolymer were investigated as functions of the acid (MAA) and ion content. Midblock relaxation times (τ) increased with increasing acid and ion content; however, the activation energy extracted from an Arrhenius analysis appeared constant for all acid and ion contents. Meanwhile, the factors of enhancement of the strain at break and tensile strength (as compared to the baseline polymer without ionic interactions or hydrogen bonding) collapsed onto master curves when plotted as functions of log τ, indicating that the mechanical behavior of the triblock copolymer could be tuned through varying the relaxation time of the midblock. The tensile strength increased by as much as a factor of 17 times greater than that of the baseline polymer. More moderate enhancements were observed in the strain at break, with the maximum strain at break occurring at intermediate relaxation times. This suggests that midblock chain dynamics are a governing factor for the mechanical property enhancements due to the effects of the ionic aggregates and chain mobility on stress dissipation under tensile deformation.

中文翻译：

通过结合离子相互作用增强可持续热塑性弹性体的机械性能

基于 ABA 三嵌段共聚物的热塑性弹性体（含有聚（甲基丙烯酸月桂酯 -共聚- 甲基丙烯酸）中间嵌段和聚（甲基丙烯酸甲酯）末端嵌段）通过用 NaOH 中和甲基丙烯酸 (MAA) 重复单元而得到增强，在中间嵌段中形成离子相互作用。研究了中间嵌段的流变性能和三嵌段共聚物的机械性能作为酸（MAA）和离子含量的函数。中嵌段弛豫时间 (τ) 随着酸和离子含量的增加而增加；然而，从阿累尼乌斯分析中提取的活化能对于所有酸和离子含量似乎都是恒定的。同时，当绘制为 log τ 的函数时，断裂应变和拉伸强度（与没有离子相互作用或氢键的基线聚合物相比）增强的因素在主曲线上崩溃，表明三嵌段共聚物的机械行为可以通过改变中间块的松弛时间来调整。拉伸强度比基线聚合物增加了 17 倍。观察到断裂应变有更适度的增强，最大断裂应变发生在中间松弛时间。这表明，由于离子聚集体和链迁移率对拉伸变形下应力耗散的影响，中嵌段链动力学是机械性能增强的控制因素。

更新日期：2024-08-26

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