Preparation and modification of thin film composite membrane using a bulky dianhydride monomer,Journal of Applied Polymer Science

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Preparation and modification of thin film composite membrane using a bulky dianhydride monomer
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-07-14 , DOI: 10.1002/app.51389
Hamidreza Rezania ₁ , Vahid Vatanpour ₁

Affiliation

One of the most effective methods to modify thin film composite (TFC) membranes is changing the chemistry of top selective layer by different monomers and different monomer concentrations. Herein, we report the preparation of modified TFC membranes using a pyromellitic dianhydride (PMDA) mixed with organic phase (trimesoyl chloride) and meta phenylene diamine (MPD). By manipulating the PMDA amount in organic phase, the structures and chemical compositions of polyamide selective layer could be modified. It was realized that the presence of PMDA could result in a modified membrane with higher surface roughness, less dense selective layer, more surface charge density, and better hydrophilic properties and consequently less fouling. The optimum PMDA concentration was found 0.05 wt%, such that the obtained membrane had 35.6 L m⁻² h⁻¹ pure water flux, about 1.6-fold higher than the reference membrane with similar salt rejection. Fouling intensity for the reference membrane was 38.1%, while for the modified membranes it decreased to 16.7%.

中文翻译：

大体积二酐单体制备及改性薄膜复合膜

改性薄膜复合 (TFC) 膜的最有效方法之一是通过不同的单体和不同的单体浓度来改变顶部选择性层的化学性质。在此，我们报道了使用均苯四酸二酐 (PMDA) 与有机相（均苯三甲酰氯）和间苯二胺 (MPD) 混合制备改性 TFC 膜。通过控制有机相中PMDA的含量，可以改变聚酰胺选择性层的结构和化学成分。人们认识到，PMDA 的存在可以导致改性膜具有更高的表面粗糙度、更低的选择性层密度、更高的表面电荷密度和更好的亲水性，因此污染更少。发现最佳 PMDA 浓度为 0.05 wt%，从而获得的膜具有 35.6 L m^-2 h ^-1纯水通量，比具有类似脱盐率的参比膜高约 1.6 倍。参考膜的污染强度为 38.1%，而改性膜的污染强度降低至 16.7%。

更新日期：2021-09-09

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