Quantitative nanoscale measurements of the thermomechanical properties of poly‐ether‐ether‐ketone (PEEK),Journal of Polymer Science

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Quantitative nanoscale measurements of the thermomechanical properties of poly‐ether‐ether‐ketone (PEEK)
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-04-09 , DOI: 10.1002/pol.20190274
Wen Qian ₁ , Wenlong Li ₁ , Charles Nguyen ₁ , Tyler J. Johnson ₂ , Joseph A. Turner ₁

Affiliation

Understanding the internal structure and organization of semicrystalline polymers, especially at the nanoscale, has many challenges for researchers to date. In this article, we demonstrate a quantitative method for investigating the local viscoelastic properties (i.e., storage and loss moduli, as well as loss tangent) of semicrystalline polyether‐ether ketone (PEEK) through the combination of contact resonance atomic force microscopy (CR‐AFM) and in situ local heating with a thermal probe. Furthermore, the local viscoelastic properties of the crystalline and amorphous phases were decoupled by performing thermal CR‐AFM array mapping near the glass transition temperature of PEEK (T_g, 143 °C). A distinct bimodal distribution of tip‐sample interaction was observed for PEEK near its T_g, providing a means to estimate the T_g and the degree of crystallinity of PEEK.

中文翻译：

聚醚醚酮（PEEK）热力学性能的纳米级定量测量

迄今为止，了解半结晶聚合物的内部结构和组织，尤其是在纳米尺度上，对研究人员提出了许多挑战。在本文中，我们通过接触共振原子力显微镜（CR-）的结合展示了一种定量方法，用于研究半结晶聚醚醚酮（PEEK）的局部粘弹性（即储能和损耗模量以及损耗角正切）原子力显微镜（AFM）和使用热探针的原位局部加热。此外，通过在PEEK的玻璃化转变温度（T _g，143°C）附近进行热CR-AFM阵列映射，可以解除结晶相和非晶相的局部粘弹性。PEEK在其T附近观察到尖端-样品相互作用的明显双峰分布_g，提供一种估算T _g和PEEK结晶度的方法。

更新日期：2020-04-09

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