The development of high-performance biobased polymers such as polyimides (PIs) is indispensable to establish a sustainable green society, but it is very difficult due to the incompatibility of their monomeric aromatic diamines with microorganisms. Here, we developed biobased PIs from bioavailable aromatic diamines, which were photodimers of 4-aminocinnamic acid (4ACA) derived from genetically manipulated Escherichia coli. These biobased PI films showed ultrahigh thermal resistance with T 10 values over 425°C and no T g values under 350°C, which is the highest value of all biobased plastics reported thus far. The PI films also showed high tensile strength, high Young's moduli, good cell compatibility, excellent transparency, and high refractive indices.

Supporting information Table of contents Efficient bioproduction of 4ACA.

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Here, we present an easy and stable one-step procedure to fabricate self-assembled nanofibers from modified chitosan.

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