A series of polyurethane membranes were synthesized through poly-addition polymerization for reverse osmosis application. Poly (ethylene glycol) with different molecular weights was used as a soft segment and structural and performance properties of membranes were investigated. FTIR spectra of membranes verified the presence of incorporated monomers and the development of urethane linkages. The water content and surface roughness of the membranes were increased progressively with an increase in the size of the soft segment. The surface hydrophilicity and development of porous structure of membranes increased water flux with compromised salt rejection as size of the soft segment was increased. The permeation properties of the membranes including salt rejection and water flux were recorded by a dead-end reverse osmosis unit. PU-3PEG membrane showed the highest salt rejection (88%) whereas the PU-15PEG membrane exhibited the highest water flux (20.7 L/h m²) at effective pressure of 60 bar. The gel content of PU membranes was decreased with increase in the molecular weight of soft segment (PEG). The antibacterial property of PU membranes was validated by the successful inhibition of the gram negative bacterium “Escherichia coli”. These results proved to be influential in interpreting the structure–property relationship of polyurethane membranes for RO process.

通过加聚反应合成了一系列聚氨酯膜，用于反渗透应用。将具有不同分子量的聚乙二醇用作软链段，并研究了膜的结构和性能。膜的FTIR光谱证实了掺入单体的存在和氨基甲酸酯键的发展。膜的水含量和表面粗糙度随着软段尺寸的增加而逐渐增加。随着软段尺寸的增加，膜的表面亲水性和膜的多孔结构的发展增加了水通量，而盐截留率却受到损害。膜的渗透性包括盐截留率和水通量，是通过死端反渗透单元记录的。²）在60 bar的有效压力下。PU膜的凝胶含量随软链段（PEG）分子量的增加而降低。通过成功抑制革兰氏阴性菌“大肠杆菌”验证了PU膜的抗菌性能。这些结果被证明对解释用于反渗透工艺的聚氨酯膜的结构-性能关系具有影响力。