Soluble, optically transparent polyamides with a phosphaphenanthrene skeleton: synthesis, characterization, gas permeation and molecular dynamics simulations
Soluble, optically transparent polyamides with a phosphaphenanthrene skeleton: synthesis, characterization, gas permeation and molecular dynamics simulations
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DOI：
10.1039/c7py00687j
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发表时间：
2017-08-07
影响因子：
4.6
通讯作者：
Banerjee, Susanta
中科院分区：
文献类型：
--
作者：
Bisoi, Soumendu;Mandal, Arun Kumar;Banerjee, Susanta
本文报道了一种新的二胺单体1，1-双[2 '-三氟甲基-4'-（4“”-氨基苯基）苯氧基]-1-（6-氧代-6H-二苯并< c，e> 1，2>氧磷杂环-6-基）乙烷与多种芳香族二元羧酸通过缩聚反应合成五种新型聚酰胺。通过不同的分析技术对聚合物进行了很好的表征。该聚合物可溶于几种有机溶剂中，并且在空气中在345-365 ° C的温度范围内表现出10%重量损失的高热稳定性。通过溶液浇铸法由这些聚合物制备膜，根据确切的聚合物重复单元结构，该膜显示出65至86 MPa范围内的拉伸强度和6至19%的断裂伸长率。通过DSC和DMA评估膜的玻璃化转变温度，并且值在265-275 ℃的范围内。膜是光学透明的，截止波长在359-396 nm范围内，并显示出低介电常数。该膜显示出非常高的气体渗透性（P-CO2 = 164.7和P-O2 = 59.7 barrer），并提供了渗透性和选择渗透性的良好平衡。分子动力学模拟的聚合物进行了使用原子模型，显示出良好的协议之间的自由体积和气体传输性能的尺寸分布。本研究提供了一个深入了解气体分子在聚合物膜中的扩散行为，其结果与实验获得的扩散行为是一致的。
The present study reports the preparation of five new polyamides from a new diamine monomer, 1,1-bis [2'-trifluoromethyl-4'-(4''-aminophenyl) phenoxy]-1-(6-oxido-6H-dibenz< c,e>< 1,2> oxaphosphorin-6-yl) ethane, with various aromatic dicarboxylic acids by polycondensation reaction. The polymers were well characterized by different analytical techniques. The polymers were soluble in several organic solvents and showed high thermal stability with 10% weight loss in the temperature range of 345-365 degrees C in air. Membranes were prepared from these polymers by the solution casting method that showed a tensile strength within the range of 65 to 86 MPa and an elongation at break of 6 to 19% depending on the exact polymer repeat unit structure. The glass transition temperature of the membranes was evaluated by DSC and DMA and the values were within the range of 265-275 degrees C. The membranes were optically transparent with a cut-off wavelength in the range of 359-396 nm and showed a low dielectric constant. The membranes showed very high gas permeability (P-CO2 = 164.7 and P-O2 = 59.7 barrer) and offered a good balance of permeability and permselectivity. Molecular dynamics simulations of the polymers were done using an atomistic model that showed good agreement between the size distribution of the free volume and gas transport properties. This study provides an insight into the diffusion behavior of gas molecules in polymer membranes and the results were consistent with the experimentally obtained diffusion behavior.