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首页> 外文期刊>Journal of Applied Polymer Science >Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO2
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Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO2

机译：工艺参数和热历史对超临界CO2对PEEK微孔泡沫行为的影响

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摘要

In this study, we mainly investigate the solid-state foaming of polyether ether ketone (PEEK) with different crystallinities using supercritical CO2 as a physical blowing agent. The gaseous mass-transfer and thermophysical behaviors were studied. By altering the parameters of the foaming process, microcellular foams with different cell morphologies were prepared. The effect of crystallization on the cell morphology was also investigated in detail. The results indicate that the crystallization restricts gas diffusion in the material, and the thermophysical behaviors of the saturated PEEK sample with low crystallinity presents two cold crystallization peaks. The cell density decreases and the cell size increases as the saturation pressure increases. The cell density of the microcellular foams prepared under 20 MPa is 1.23 x 10(10) cells/cm(3), which is almost 10 times compares to that under 8 MPa. The cell size increases as the foaming time extends or the foaming temperature increases. It is interesting that the cell morphology with a bimodal cell-size distribution is generated when the samples are foamed at temperatures higher than 320 degrees C for a sufficient time. Additionally, nanocellular foams can be obtained from a highly crystallized PEEK after the decrystallization process. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42576.
机译：在这项研究中，我们主要研究使用超临界CO2作为物理发泡剂，对不同结晶度的聚醚醚酮（PEEK）进行固态发泡。研究了气态传质和热物理行为。通过改变发泡过程的参数，制备了具有不同泡孔形态的微孔泡沫。还详细研究了结晶对细胞形态的影响。结果表明，结晶限制了气体在材料中的扩散，低结晶度的饱和PEEK样品的热物理行为表现出两个冷结晶峰。随着饱和压力的增加，孔密度减小，孔尺寸增大。在20 MPa下制备的微孔泡沫的孔密度为1.23 x 10（10）个细胞/ cm（3），几乎是在8 MPa下的10倍。随着发泡时间的延长或发泡温度的增加，孔的尺寸增加。有趣的是，当样品在高于320摄氏度的温度下发泡足够长的时间后，便会产生具有双峰孔尺寸分布的孔形态。另外，在去结晶过程之后，可以从高度结晶的PEEK获得纳米孔泡沫。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42576。

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