Abstract Poly (decamethylene terephthalamide) (PA10T) is a kind of engineering plastics with high strength and high modulus, but one of its disadvantages is its low elongation at break. In order to improve the flexibility of PA10T, one aliphatic comonomer with a long alkyl chain is introduced to the molecular chain of PA10T. Then long chain semiaromatic copolyamides 10T/1014 were synthesized with different contents of 1014 units by polycondensation reaction of 1,10-diaminodecane, terephthalic acid and 1,12-dodecanedicarboxylic acid in deionized water. The intrinsic viscosities of the resultant polyamides ranged from 0.90 to 1.03 dL/g were obtained. The chemical and crystal structures of the copolymers were characterized by FTIR, 1H-NMR and WAXD. These copolyamides exhibited outstanding thermal properties with melting points range of 306–295 °C and degradation temperatures range of 479–472 °C at maximum degradation rate, and also have a wider processing window than PA10T. The tensile strength of PA10T/1014 copolymers decreased gradually from 80.02 to 72.95 MPa as the content of 1014 units increasing from 5 to 20 mol %, while the elongation at break increased significantly from 57 to 150%. The moisture content of 10T/1014 copolyamides decreased with increasing the 1014 unit contents. It suggests that 10T/1014 copolyamides could be a kind of promising heat-resistant engineering thermoplastic in the future applications.

中文翻译：

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高性能、柔性半芳香族共聚酰胺10T/1014的合成与表征


摘要 聚对苯二甲酰胺（PA10T）是一种高强度、高模量的工程塑料，但其缺点之一是断裂伸长率较低。为了提高PA10T的柔韧性，在PA10T的分子链上引入了一种具有长烷基链的脂肪族共聚单体。然后以1,10-二氨基癸烷、对苯二甲酸和1,12-十二烷二甲酸在去离子水中进行缩聚反应，合成了不同含量的1014个单元的长链半芳香共聚酰胺10T/1014。所得聚酰胺的特性粘度为0.90至1.03dL/g。通过FTIR、1H-NMR和WAXD对共聚物的化学和晶体结构进行了表征。这些共聚酰胺表现出出色的热性能，熔点范围为 306–295 °C，最大降解速率下的降解温度范围为 479–472 °C，并且还具有比 PA10T 更宽的加工窗口。随着1014单元含量从5 mol%增加到20 mol%，PA10T/1014共聚物的拉伸强度从80.02 MPa逐渐下降到72.95 MPa，而断裂伸长率从57%显着增加到150%。 10T/1014共聚酰胺的含水量随着1014单元含量的增加而降低。这表明10T/1014共聚酰胺在未来的应用中可能是一种有前途的耐热工程热塑性塑料。