Bisphenol-A polycarbonate (BPA-PC) has been widely used, but it has been restricted from use in several food-contact products due to the estrogen-like and antiandrogen effects of BPA. With the aim of developing novel, biobased, and ecologically safe high-performance polycarbonates with the potential to replace BPA-PC, in this work, a series of novel biobased copolycarbonates, viz., poly(isosorbide carbonate-co-isoidide-2,5-dimethylene carbonate) (PIsIeC), were designed and successfully synthesized via melt polymerization. The combination of two isohexide building blocks, the highly rigid isosorbide (IS) and the semirigid isoidide-2,5-dimethanol (IIDML), afforded an optimal candidate (PIsIeC-39) with a nice balance of high T_g (120.5 °C), high tensile strength (72.6 MPa), and also a high elongation at break (75.2%), which are comparable or even surpass the properties of BPA-PC and a few oil-based commercial benchmarks. The SEC/viscosity results and also a DFT simulation jointly revealed that the molecular weights of these copolycarbonates were significantly enhanced when using the two isohexide building blocks together due to a possible autocatalytic effect induced by the hydrogen bonding between IIDML and IS. These polymers were obtained with number-average molecular weights of 27,300–113,200 g/mol and intrinsic viscosities of 54–83 mL/g, which are also comparable to those of BPA-PC. Meanwhile, all copolycarbonates have good transparency similar to BPA-PC and also exhibit similar γ-relaxation and higher biobased content (72–84%). These biobased copolycarbonates with superior thermal and mechanical properties have high potential to be an ecologically safe alternative for BPA-PC.

中文翻译：

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坚固、坚韧且耐热的基于异己糖醇的共聚碳酸酯：双酚 A 聚碳酸酯的生态安全替代品

双酚A聚碳酸酯(BPA-PC)已被广泛使用，但由于BPA具有类雌激素和抗雄激素作用，其在多种食品接触产品中的使用受到限制。为了开发具有替代 BPA-PC 潜力的新型生物基、生态安全的高性能聚碳酸酯，在这项工作中，开发了一系列新型生物基共聚碳酸酯，即聚（异山梨醇碳酸酯-co -isoidide-2）， 5-二亚甲基碳酸酯）（PIsIeC），通过熔融聚合设计并成功合成。两种异己糖醇结构单元，即高刚性异山梨醇 (IS) 和半刚性异艾杜醇-2,5-二甲醇 (IIDML) 的组合，提供了具有高Tg（120.5 °C）良好平衡的最佳候选物 (PIsIeC-39) _。）、高拉伸强度（72.6 MPa）和高断裂伸长率（75.2%），这些性能可与 BPA-PC 和一些油基商业基准的性能相媲美甚至超过。 SEC/粘度结果以及 DFT 模拟共同表明，当同时使用两种异己糖醇结构单元时，这些共聚碳酸酯的分子量显着提高，这是由于 IIDML 和 IS 之间的氢键可能引起的自催化效应。这些聚合物的数均分子量为 27,300–113,200 g/mol，特性粘度为 54–83 mL/g，也与 BPA-PC 相当。同时，所有共聚碳酸酯都具有与 BPA-PC 类似的良好透明度，并且还表现出类似的 γ 弛豫和更高的生物基含量 (72-84%)。这些生物基共聚碳酸酯具有优异的热性能和机械性能，很有可能成为 BPA-PC 的生态安全替代品。