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The two-step synthetic route and characterization data summary of the L-leucine-based PEU (Poly(1-LEU-10)). In the first step, 1 e.q. of 1,10-decanediol is condensed with 2.3 e.q. of L-leucine to yield the monomer. During this step, the amino acids are protonated with p-toluene sulphonic acid to prevent amidation reactions. In the second step, interfacial polycondensation of monomers with triphosgene yields PEU homopolymer.
