Abstract A novel aliphatic PA6 copolyamide (PA6(BAEA/AA))-based hot melt adhesive was synthesized from e-caprolactam with the organic salt of bis(2-aminoethyl) adipamide (BAEA) and adipic acid (AA), with BAEA/AA content ranges from 5 to 15 mol%. The chemical structures of BAEA diamine, BAEA/AA organic salt, PA6(BAEA/AA) copolyamides, and neat PA6 were obtained using FT-IR and 1H NMR. Determined by the comonomer compositions, the relative viscosity (ηr) and molecular weight (Mw) of the PA6(BAEA/AA) were from 2.29 to 2.74 and from 14,530 to 19,500 g mol−1, respectively. Adding the BAEA/AA structure strongly affected the crystallization behavior and thermal properties of the copolyamides. DSC results revealed that the melting temperature (Tm) of the copolyamides declined as the mole% of BAEA/AA increased in the range 5–15 mol%, and a TGA test revealed that the thermal decomposition of the copolyamides was similar to that of neat PA6. The Tm, glass transition temperature (Tg), and thermal stability (Td5%) with a BAEA/AA salt content of 10 mol% had the lowest values of 162.2, 40.3, 354.6 °C, respectively, while the fusion enthalpy (ΔHm) was lowest at 15 mol% (21.2 J g−1). Most remarkably, PA6(BAEA/AA) exhibits much better mechanical properties such as tensile strength (33.6–52.6 MPa) and elongation at breakage (114.7–584.5%), than the PA6 homopolymer. The peel strength of PA6 reached a maximum value of 53.4 N cm−1 at 10 mol% of BAEA/AA salt, and this value is better than those of commercial hot melt adhesives.

中文翻译：

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用作热熔粘合剂并衍生自新型脂肪族二胺双（2-氨基乙基）己二酰胺和己二酸的共聚单体的低温聚酰胺 6 (PA6) 共聚聚酰胺的合成和表征

摘要 以ε-己内酰胺与己二酰胺双(2-氨基乙基)己二酸(BAEA)和己二酸(AA)的有机盐为原料，合成了一种新型脂肪族PA6共聚酰胺(PA6(BAEA/AA))基热熔胶，BAEA/ AA 含量范围为 5 至 15 mol%。BAEA 二胺、BAEA/AA 有机盐、PA6(BAEA/AA) 共聚酰胺和纯 PA6 的化学结构是使用 FT-IR 和 1H NMR 获得的。根据共聚单体组成，PA6(BAEA/AA) 的相对粘度 (ηr) 和分子量 (Mw) 分别为 2.29 至 2.74 和 14,530 至 19,500 g mol-1。添加 BAEA/AA 结构强烈影响共聚酰胺的结晶行为和热性能。DSC 结果显示共聚酰胺的熔融温度 (Tm) 随着 BAEA/AA 的摩尔百分比在 5-15 mol% 范围内增加而下降，TGA 测试表明共聚酰胺的热分解与纯 PA6 的热分解相似。BAEA/AA 盐含量为 10 mol% 时，Tm、玻璃化转变温度 (Tg) 和热稳定性 (Td5%) 的最低值分别为 162.2、40.3、354.6 °C，而熔化焓 (ΔHm)最低为 15 mol% (21.2 J g-1)。最显着的是，与 PA6 均聚物相比，PA6(BAEA/AA) 表现出更好的机械性能，如拉伸强度 (33.6-52.6 MPa) 和断裂伸长率 (114.7-584.5%)。PA6 的剥离强度在 10 mol% BAEA/AA 盐时达到最大值 53.4 N cm-1，该值优于市售热熔胶。BAEA/AA 盐含量为 10 mol% 时，热稳定性 (Td5%) 的最低值分别为 162.2、40.3、354.6 °C，而熔化焓 (ΔHm) 最低，为 15 mol% (21.2 J g -1). 最显着的是，与 PA6 均聚物相比，PA6(BAEA/AA) 表现出更好的机械性能，如拉伸强度 (33.6-52.6 MPa) 和断裂伸长率 (114.7-584.5%)。PA6 的剥离强度在 10 mol% BAEA/AA 盐时达到最大值 53.4 N cm-1，该值优于市售热熔胶。BAEA/AA 盐含量为 10 mol% 时，热稳定性 (Td5%) 的最低值分别为 162.2、40.3、354.6 °C，而熔化焓 (ΔHm) 最低，为 15 mol% (21.2 J g -1). 最显着的是，与 PA6 均聚物相比，PA6(BAEA/AA) 表现出更好的机械性能，如拉伸强度 (33.6-52.6 MPa) 和断裂伸长率 (114.7-584.5%)。PA6 的剥离强度在 10 mol% BAEA/AA 盐时达到最大值 53.4 N cm-1，该值优于市售热熔胶。比 PA6 均聚物。PA6 的剥离强度在 10 mol% BAEA/AA 盐时达到最大值 53.4 N cm-1，该值优于市售热熔胶。比 PA6 均聚物。PA6 的剥离强度在 10 mol% BAEA/AA 盐时达到最大值 53.4 N cm-1，该值优于市售热熔胶。