Chemically recyclable nanofiltration membranes fabricated from two circular polymer classes of the same monomer origin

IF 4.9 Q1 ENGINEERING, CHEMICAL Journal of Membrane Science Letters Pub Date : 2024-01-28 DOI:10.1016/j.memlet.2024.100067
Rifan Hardian , Abdul Ghaffar , Changxia Shi , Eugene Y.-X. Chen , Gyorgy Szekely
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Abstract

Nanofiltration is widely used in various industries to separate solutes from solvents. To foster a circular economy, establishing a closed-loop lifecycle for the membrane materials is highly important. In this study, we fabricated recyclable nanofiltration membranes from chemically recyclable polymers —polyester P(BiL=)ROP and poly(cyclic olefin) P(BiL=)ROMP— using γ-butyrolactone as a green solvent. These two polymers, of two different polymer classes, were obtained from a single monomer, which could be recycled back to the same monomer, exhibiting the unique “one monomer–two polymers–one monomer” closed-loop chemical circularity. The effect of physical treatment, such as annealing, hot-pressing, and air exposure on the morphological characteristics and performance of the nanofiltration membranes was investigated. We revealed the interplay between membrane pore size, thickness, density and the molecular sieving performance of the nanofiltration membranes. Solute rejections were mainly governed by the membrane pore size. However, solvent flux was mainly governed by the membrane density that determines the free volume interconnectivity. The membranes exhibited a tunable molecular weight cutoff between 553 and 777 g mol−1 and methanol permeance between 5.9 and 9.8 L m–2 h–1 bar−1. The membranes exhibited excellent long-term nanofiltration stability over 1 week. The combination of the green solvent used for membrane fabrication and the circular life cycle of the polymer membrane brings one step closer to closing the circularity loop of membrane technology.

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用同源的两种环状聚合物制成的化学可循环纳滤膜
纳滤广泛应用于各行各业,用于从溶剂中分离溶质。为了促进循环经济,建立膜材料的闭环生命周期非常重要。在这项研究中,我们使用γ-丁内酯作为绿色溶剂,用化学可回收聚合物--聚酯 P(BiL=)ROP 和聚环烯烃 P(BiL=)ROMP 制作了可回收纳滤膜。这两种聚合物属于两种不同的聚合物类别,均由单一单体制得,并可回收为相同的单体,表现出独特的 "一个单体-两种聚合物-一个单体 "闭环化学循环性。研究了退火、热压和空气暴露等物理处理对纳滤膜形态特征和性能的影响。我们揭示了膜孔径、厚度、密度与纳滤膜分子筛分性能之间的相互作用。溶质截留主要受膜孔径的影响。然而,溶剂通量主要受决定自由体积互联性的膜密度的影响。膜的可调分子量截止值介于 553 和 777 g mol-1 之间,甲醇渗透率介于 5.9 和 9.8 L m-2 h-1 bar-1 之间。膜在 1 周内表现出卓越的长期纳滤稳定性。膜制造所使用的绿色溶剂与聚合物膜的循环生命周期相结合,使膜技术的循环闭环更近了一步。
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