Abstract A series of renewable, long-chain, fatty acid-derived polyamides (PA) ranging from PA 6,14 to PA 6,18 were synthesized via polycondensation, yielding very high molecular weights and a remarkable property profile distinct from short-chain commercial grades. Most notably, synthesized polyamides exhibited good impact resistance, excellent stiffness-to-toughness balance and very low water absorption yet high oxygen and water vapour permeability; with this property profile being exemplified by PA 6,18. The increased repeating unit length and reduced number of amide linkages able to participate in interchain hydrogen bonding imparted a strong influence on material properties. The data highlights the benefits and technical advantages of utilising long-chain polyamides, while also significantly expanding the repertoire, knowledge and property profile of the long-chain aliphatic polyamide family, and providing a basis for further development of polyamides from renewable sources.

中文翻译：

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通过可再生的长链脂肪族链段重新定义聚酰胺特性：实现抗冲击性和低吸水性

摘要 通过缩聚反应合成了一系列可再生的、长链的、脂肪酸衍生的聚酰胺 (PA)，范围从 PA 6,14 到 PA 6,18，具有非常高的分子量和显着的不同于短链商业应用的特性。成绩。最值得注意的是，合成聚酰胺表现出良好的抗冲击性、优异的刚度与韧性平衡以及极低的吸水率和高氧气和水蒸气渗透率；此属性配置文件以 PA 6,18 为例。重复单元长度的增加和能够参与链间氢键的酰胺键数量的减少对材料性能产生了强烈的影响。数据突出了利用长链聚酰胺的好处和技术优势，同时也显着扩展了曲目，