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We have synthesized new bio‐based polyureas (PUs) using 4‐aminophenylalanine (4‐APhe) as a diamine monomer bioavailable by fermentation of genetically modified Escherichia coli. Most of PUs are processable into films or fibers having excellent mechanical properties; mechanical strength at maximum around 150 MPa and strain energy density around 10 J/cm3 at maximum, which means that PU much tougher...
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