Preparation and Application of Lignin-based Poly(ionic liquid)Membranes
Lignin star-shaped grafted poly(acrylic acid)copolymers(Lignin-g-PAA)with different grafting densities were synthesized via atom transfer radical polymerization(ATRP),and then electrostatically complexed in situ with imidazolium-based poly(ionic liquid)(PCMVImTFSI)to prepare lignin-based polyelectrolyte membranes(Lignin-PILM)with gradient pore structures.The influence of grafting density of Lignin-g-PAA on the thermal stability,surface morphology,and pore size distribution of the membrane was investigated.Specifically,Lignin-PILM constructed by Lignin2-g-PAA9 with moderate grafting density exhibited a gradient nano-pore structure and excellent thermal stability.Subsequently,the effect of Lignin-g-PAA copolymer content on the UV shielding performance of the membrane was explored.The study revealed that higher Lignin-g-PAA content resulted in superior UV shielding capability and visible light transmittance of the membrane.
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