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首页> 外文期刊>Journal of Membrane Science >Formation and thermal stability of BMI-based interpenetrating polymers for gas separation membranes
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Formation and thermal stability of BMI-based interpenetrating polymers for gas separation membranes

机译：用于气体分离膜的BMI基互穿聚合物的形成和热稳定性

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Semi-interpenetrating polymer networks (semi-IPNs) were prepared by sol-gel technique through in situ polymerization of bismaleimide (BMI) in thermoplastic polyetherimide (PEI) as well as in polysulfone (PSF). This synthesis route allows arresting thermoset/thermoplastic phase separation at an early stage by solidifying the semi-IPNs through membrane phase inversion. The phase separation could be observed visually in the casting solution or by optical microscope on the surface of the produced membranes. These semi-IPNs with a density lower than their thermoplastic base polymer allowed easier water penetration during membrane phase inversion. This led to improved membrane morphology that was confirmed by scanning electron microscopy. Membranes fabricated from these semi-IPN materials had thinner skin layers and longer straight fingers perpendicular to membrane surface. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that these semi-IPNs membranes have improved glass transition temperatures but a lower thermal stability. However, at ambient conditions, these membranes with their improved structure and morphology showed superior gas separation characteristics compared to base polymers. For example, the permeance was increased by 12-15 times without a significant decrease in the selectivity of oxygen over nitrogen in air separation experiments. Crown Copyright (c) 2006 Published by Elsevier B.V. All rights reserved.
机译：通过在热塑性聚醚酰亚胺（PEI）和聚砜（PSF）中双马来酰亚胺（BMI）的原位聚合，通过溶胶-凝胶技术制备了半互穿聚合物网络（semi-IPN）。该合成路线允许通过膜相转化来固化半IPN，从而在早期阻止热固性/热塑性相分离。可以在流延溶液中目视观察相分离，或者通过光学显微镜在所产生的膜的表面上观察相分离。这些半IPN的密度低于其热塑性基础聚合物的密度，使其在膜相转化过程中更容易渗透水。这导致改善的膜形态，这通过扫描电子显微镜得以证实。由这些半IPN材料制成的膜具有较薄的表皮层和垂直于膜表面的较长的直指。差示扫描量热法（DSC）和热重分析（TGA）表明，这些半IPN膜具有改善的玻璃化转变温度，但热稳定性较低。然而，在环境条件下，与基础聚合物相比，这些具有改善的结构和形态的膜表现出优异的气体分离特性。例如，在空气分离实验中，渗透率增加了12-15倍，而氧对氮的选择性没有明显降低。官方版权（c）2006，Elsevier B.V.保留所有权利。

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