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首页> 外文期刊>RSC Advances >Aromatic poly(ether ether ketone)s capable of crosslinking via UV irradiation to improve gas separation performance
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Aromatic poly(ether ether ketone)s capable of crosslinking via UV irradiation to improve gas separation performance

机译：能够通过紫外线辐射交联的芳香族聚醚醚酮，可改善气体分离性能

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The effect of UV-crosslinking on the gas transport properties of two poly(ether ether ketone)s derived from difluorobenzophenone and two bisphenol derivatives, with four (TMBP-DFB) or six (HMBP-DFB) methyl groups, has been studied. The crosslinking reaction was conducted on dense membranes, using polychromatic light, with wavelengths higher than 350 nm, at room temperature and in presence of air. Both polymers were able to produce crosslinked membranes, with gel fractions close to 75%, but a shorter irradiation time was required for HMBP-DFB. A DFT quantum mechanical study has stated that HMBP-DFB radical formation is much easier than for TMBP-DFB, which would support the fastest kinetics of the crosslinking process for HMBP-DFB. The crosslinked membranes have shown greatly improved gas transport properties, especially for the O2/N2 gas pair, where the Robeson upper bound line of 1991 was clearly surpassed. The improvement in selectivity has been ascribed to the better molecular-sieving characteristics of crosslinked membranes.
机译：研究了紫外线交联对衍生自二氟二苯甲酮和两种具有四个（TMBP-DFB）或六个（HMBP-DFB）甲基的双酚衍生物的两种聚醚醚酮的气体输运性能的影响。在室温和空气存在下，使用波长大于350 nm的多色光在致密膜上进行交联反应。两种聚合物均能够产生交联的膜，凝胶分数接近75％，但是HMBP-DFB需要更短的照射时间。 DFT量子力学研究表明，HMBP-DFB自由基的形成要比TMBP-DFB容易得多，这将支持HMBP-DFB交联过程的最快动力学。交联膜显示出大大改善的气体传输性能，尤其是对于O 2 / N 2 气体对，明显超过了1991年的Robeson上限。选择性的提高归因于交联膜的更好的分子筛特性。

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