【摘要】 以1,4-双（3-氨基丙基）哌嗪为原料通过界面反应制备二氟酰胺单体N, N’-（1,4-哌嗪二基-3,1-丙二基）双（4-氟苯甲酰胺）（FDC-200），并与联苯二砜、4,4’-二氯二苯砜通过高温溶液缩聚反应制备了一系列新型半芳族聚酰胺（SPAS树脂）。通过傅里叶变换红外光谱（FTIR）和核磁氢谱（~1H-NMR）表征了新型单体及聚合物的化学结构，结果表明，单体及聚合物已成功制备。半芳族聚酰胺具有优异的热性能，其玻璃化转变温度为149.0～171.2℃，热失重5%所对应的温度为385.8～395.6℃，随着半芳族聚酰胺中二苯砜结构逐渐增加，聚合物的玻璃化转变温度逐渐增高。聚合物具有优异的力学性能，其拉伸强度大于60 MPa且随着二苯砜共聚比例的增加而逐渐增高。二苯砜结构提升了半芳族聚酰胺的疏水性，降低聚合物吸水率至3.7%。此外，二苯砜结构的引入使聚合物变为无定形，提升了半芳族聚酰胺的溶解性，溶解性的增加有效的拓宽了含哌嗪环半芳族聚酰胺的可加工性能。同时分子结构的变化赋予半芳族更好的阻燃性，提高了半芳族聚酰胺的应用领域。更多还原

【Abstract】 Semi-aromatic polyamides combine the desirable properties of both aromatic and aliphatic polyamides. In this study, a novel difluorobenzamide monomer, N,N’-（1,4-Piperazinediyldi-3,1-propanediyl） bis(4-fluorobenzamide)(FDC-200), was synthesized via a facile interfacial reaction between 1,4-bis(3-aminopropyl)piperazine and 4-fluorobenzoyl chloride. A series of polyamides incorporating piperazine rings were subsequently prepared from this monomer through nucleophilic substitution polymerization. The chemical structures of the monomer and polymers were confirmed by FTIR and 1H-NMR spectroscopy. These novel polyamides exhibited outstanding thermal properties, with glass transition temperatures ranging from 149. 0 to 171. 4 ℃ and a 5 % weight loss temperature exceeding 385 ℃. The incorporation of a diphenyl sulfone moiety was found to significantly enhance multiple material properties. Specifically, it improved tensile strength(exceeding 60 MPa), increased hydrophobicity(water absorption as low as 3. 7 % for sample SPAS-50), and enhanced solubility, thereby broadening processability. Furthermore, the diphenyl sulfone structure imparted excellent flame retardancy, with sample SPAS-50 achieving a UL 94 V-1 rating. This work demonstrates a promising strategy for developing high-performance semi-aromatic polyamides with a versatile property profile.更多还原