writer：Guiyan Zhao; Yongfeng Men; Zhonghua Wu; Xiangling Ji; Wei Jiang
keywords：PEEK, crystallization, shear flow, WAXD, SAXS, DSC, poly(ether ether ketone)
source：期刊
specific source：Journal of Polymer Science: Part B: Polymer Physics, Vol. 48, 220-225 (2010)
Issue time：2010年

本文利用离线广角X射线衍射(WAXD)、小角X射线散射(SAXS)和差示扫描量热计(DSC)研究了剪切对聚醚醚酮（PEEK）结晶行为的影响。当样品在330℃结晶时，观察到短期剪切引起的PEEK在剪切方向上WAXD图谱强度的变化。结果表明，垂直于(110)和(111)晶面的晶粒尺寸随剪切率增大而减小，而垂直于(200)晶面的晶粒尺寸随剪切率增大而增大。此外，增加剪切率可导致结晶度以及晶层平均厚度的增加。当剪切率增加到30 s-1时，在随后的DSC扫描中发现了一个新的高温熔融峰。

The effect of shear on the crystallization behavior of the poly(ether ether ketone) (PEEK) has been investigated by means of ex situ wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and differential scanning calorimetry (DSC). The changes of the intensity of WAXD patterns along shear direction of the PEEK induced by short-term shear were observed when the samples crystallized at 330 ℃. The results showed that the dimensions of the crystallites perpendicular to the (110) and (111) planes reduced with the increase of shear rate, whereas the dimensions of the crystallites perpendicular to (200) plane increased with the increase of shear rate. Moreover, increasing shear rate can lead to the increase of the crystallinity as well as the average thickness of the crystalline layers. Correspondingly, a new melting peak at higher temperature was found during the subsequent DSC scanning when the shear rate was increased to 30 s-1.

论文链接：https://doi.org/10.1002/polb.21851