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 T₁₀ 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.

中文翻译：

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4-氨基肉桂酸光二聚体的生物基聚酰亚胺

高性能生物基聚合物（如聚酰亚胺（PIs））的开发对于建立可持续的绿色社会是必不可少的，但由于其单体芳香族二胺与微生物的不相容性，这是非常困难的。在这里，我们从可生物利用的芳香族二胺中开发出了基于生物的PI，这些芳香族二胺是源自转基因大肠杆菌的4-氨基肉桂酸（4ACA）的光二聚体。这些基于生物的PI膜显示出超高的耐热性，在425°C时的T ₁₀值且无T _g温度低于350°C，这是迄今为止报道的所有生物基塑料中的最高值。PI膜还显示出高拉伸强度，高杨氏模量，良好的电池相容性，出色的透明性和高折射率。