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首页> 外文期刊>RSC Advances >Polyhedral oligomeric silsesquioxane/polyamide bio-nanocomposite membranes: structure-gas transport properties
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Polyhedral oligomeric silsesquioxane/polyamide bio-nanocomposite membranes: structure-gas transport properties

机译：多面体低聚倍半硅氧烷/聚酰胺生物纳米复合膜：结构-气体传输性能

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摘要

A series of bio-nanocomposite membranes based on different loadings of polyhedral oligomeric silsesquioxane (POSS) and dimer fatty acid polyamide was prepared by a facile solution casting method and their gas-transport properties were evaluated using oxygen, nitrogen and carbon dioxide. Intactness of POSS molecules in the polyamide was confirmed by Si-29 CP/MAS NMR and FT-IR experiments. The formation of effective H-bonding interactions between POSS and polyamide was confirmed by FT-IR. The surface morphological features of the membranes prepared were analyzed using TEM, SEM and AFM techniques. TEM images revealed excellent dispersion of POSS into the membranes and it (POSS) was found to be in the range of 10 to 20 nanometers size. SEM images showed no agglomeration, even at a high content of POSS. AFM 3-D images of the membranes indicated a slight increase in surface roughness with increased POSS content. The hydrophilic/hydrophobic nature and the surface free energy of the nanocomposite membranes prepared were analysed by contact angle measurements using the Sessile drop method. Considerable influence of POSS on the glass transition temperature of the bio-nanocomposite membranes was observed. Increasing the POSS content decreased the free volume and increased the density of the membranes. These properties can be used to determine the permeability and selectivity of the membranes prepared.
机译：通过简便的溶液流延法制备了一系列基于多面体低聚倍半硅氧烷（POSS）和二聚脂肪酸聚酰胺的不同负载量的生物纳米复合膜，并利用氧气，氮气和二氧化碳对它们的气体传输性能进行了评估。通过Si-29 CP / MAS NMR和FT-IR实验证实了聚酰胺中POSS分子的完整性。通过FT-IR证实了POSS和聚酰胺之间有效的H键相互作用的形成。使用TEM，SEM和AFM技术分析所制备的膜的表面形态特征。 TEM图像显示POSS极佳地分散在膜中，其（POSS）的大小在10至20纳米之间。 SEM图像显示即使在高含量的POSS下也没有团聚。膜的AFM 3-D图像表明，随着POSS含量的增加，表面粗糙度略有增加。所制备的纳米复合膜的亲水/疏水性质和表面自由能通过使用滴滴法的接触角测量来分析。观察到POSS对生物纳米复合膜的玻璃化转变温度有相当大的影响。增加POSS含量会减少自由体积并增加膜的密度。这些性质可用于确定所制备的膜的渗透性和选择性。

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