Synthesis and characterization of poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt‐PA6T/62),Journal of Applied Polymer Science

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Synthesis and characterization of poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt‐PA6T/62)
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-08-19 , DOI: 10.1002/app.49773
Yuanbo Gao _{1,

2} , Tingting Yang _{1,

2} , Xueli Wang ₂ , Yumin Xia ₁ , Bo Zhu ₃ , Yong He _{1,

2}

Affiliation

As a representative polyoxamide, poly(hexamethylene oxamide) (PA62) has good comprehensive performance. However, the high T_m (330°C) creates an obstacle for processing. To improve the processability of PA62, poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt‐PA6T/62) was synthesized by hexamethylene diamine‐terminated 6T6‐diamine and dibutyl oxalate via solution/solid state polycondensation. Random copolyamide (ran‐PA6T/62) was also synthesized for comparison. The structure and properties of the copolymer were analyzed by Fourier transform infrared spectroscopy (FT‐IR), nuclear magnetic resonance (NMR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Wide‐angle X‐ray diffraction (WAXD) and the saturated water absorption test. The NMR results confirm the alternating structure of alt‐PA6T/62. The DSC and TGA results demonstrate that the novel alternating copolyamide alt‐PA6T/62 (T_m = 321°C, T₅ = 420°C) exhibited better thermal properties than those of ran‐PA6T/62 (T_m = 294°C, T₅ = 412°C). The saturated water absorption of alt‐PA6T/62 was found to be 3.2 wt%. These results revealed that the novel alt‐PA6T/62 had an alternating sequence distribution, showed a high melting point as well as good processability and thermal stability, and possessed low saturated water absorption and excellent dimensional stability.

中文翻译：

聚（对苯二甲酸六亚甲基酯/六亚甲基乙酰胺）交替共聚酰胺（alt-PA6T / 62）的合成与表征

作为代表性的聚草酰胺，聚（六亚甲基草酰胺）（PA62）具有良好的综合性能。但是，高T _m（330°C）会造成加工障碍。为了提高PA62的可加工性，由六亚甲基二胺封端的6T6-二胺和草酸二丁酯通过溶液/固态缩聚反应合成了聚对苯二甲酸六亚甲基/六亚甲基乙酰胺交替交替的共聚酰胺（alt-PA6T / 62）。还合成了无规共聚酰胺（ran-PA6T / 62）用于比较。通过傅立叶变换红外光谱（FT-IR），核磁共振（NMR）光谱，差示扫描量热法（DSC），热重分析（TGA），广角X射线衍射（WAXD）分析了共聚物的结构和性能）和饱和吸水率测试。NMR结果证实alt-PA6T / 62的交替结构。DSC和TGA结果表明，新型交替共聚酰胺alt-PA6T / 62（T _m = 321°C，T ₅ = 420°C）具有比ran‐PA6T / 62（T _m = 294°C，T ₅ = 412°C）更好的热性能。发现alt-PA6T / 62的饱和吸水率为3.2 wt％。这些结果表明，新型alt-PA6T / 62具有交替的序列分布，具有高熔点以及良好的可加工性和热稳定性，并具有较低的饱和吸水率和优异的尺寸稳定性。

更新日期：2020-08-20

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