In this study novel, fully and partially bio-based polyamides containing spiroacetal moieties in the backbone derived from bio-glycerol and bio-ethanol were prepared and characterized. The renewable diamine employed to obtain a series of polyamides was synthesized by means of thiolene click chemistry and therefore contains flexible thioether as well as rigid spiroacetal moieties. Two different chemical pathways for the polymerization were investigated and evaluated. The polymerization of polyamide salts proved to be the most promising method and therefore salt polymerization was applied in the synthesis of polyamides with aliphatic and aromatic di-carboxylic acids. Subsequently, the structure of the polymers was confirmed by Maldi-ToF analysis and additionally thermal and mechanical properties were investigated revealing T-g's between 24 and 80 degrees C and ductile materials with moduli between 1.0 and 1.5 GPa. Both semicrystalline and amorphous polyamides were thermally stable and therefore suitable for thermal processing. In the end, degradation studies were performed on the acetal containing polyamides which showed that the polymers were stable at pH 3 and higher.

中文翻译：

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基于部分生物基螺二胺的聚酰胺

在这项研究中，制备并表征了新型、完全和部分生物基聚酰胺，其骨架中含有来自生物甘油和生物乙醇的螺缩醛部分。用于获得一系列聚酰胺的可再生二胺是通过噻吩点击化学合成的，因此包含柔性硫醚以及刚性螺缩醛部分。研究和评估了聚合的两种不同化学途径。聚酰胺盐的聚合被证明是最有前途的方法，因此盐聚合被用于合成具有脂肪族和芳香族二元羧酸的聚酰胺。随后，聚合物的结构通过 Maldi-ToF 分析得到证实，此外还研究了热和机械性能，揭示了 Tg' s 在 24 到 80 摄氏度之间，以及模量在 1.0 到 1.5 GPa 之间的延展性材料。半结晶和无定形聚酰胺都是热稳定的，因此适用于热加工。最后，对含缩醛的聚酰胺进行了降解研究，结果表明聚合物在 pH 值为 3 或更高时是稳定的。