Thermoplastic elastomers (TPEs) are useful in various engineering and healthcare applications. A new fully biobased polyamide TPE (PA36,9) with medium hardness is reported. The elastomer is synthesized using a fatty dimer amine and azelaic acid, via one-pot melt condensation polymerization. The resulting elastomer shows a melting temperature of 83.6 °C, a medium hardness (Shore A/Shore D = 90/35), a large elongation at break (1220%), good resilience, and impact resistance, while maintaining high tensile strength (31.8 MPa), low density (0.93 g cm⁻³), and hydrophobicity. The chemical structure of the repeating unit, together with the molecular weight and molecular weight distribution, of the polymer governs the properties of the resulting polyamide, which differ from those of conventional aliphatic polyamides. This biobased polyamide elastomer is a promising candidate to substitute some fossil fuel-based medium-hardness TPEs for applications, such as insulation, sealing, automotives, and construction.

中文翻译：

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具有中等硬度的新型生物基聚酰胺热塑性弹性体

热塑性弹性体 (TPE) 可用于各种工程和医疗保健应用。报道了一种具有中等硬度的新型全生物基聚酰胺 TPE (PA36,9)。弹性体是使用脂肪二聚胺和壬二酸通过一锅熔融缩聚合成的。所得弹性体的熔融温度为 83.6 °C，中等硬度（肖氏 A/肖氏 D = 90/35）、较大的断裂伸长率（1220%）、良好的回弹性和抗冲击性，同时保持高拉伸强度（ 31.8 MPa), 低密度 (0.93 g cm ^-3) 和疏水性。聚合物的重复单元的化学结构以及分子量和分子量分布决定了所得聚酰胺的性质，这些性质不同于常规脂肪族聚酰胺的性质。这种生物基聚酰胺弹性体是替代一些基于化石燃料的中等硬度 TPE 的有前途的候选材料，可用于绝缘、密封、汽车和建筑等应用。