Semiaromatic polyamides are used for metal replacement in advanced engineering applications to reduce weight and improve efficiency, but their range of application is limited by their inherent lack of ductility and toughness. Here, we combined semiaromatic polyamide poly(hexamethylene terephthalamide-co-isophthalamide) (PA6TI) with up to 30 wt % amine-terminated polyethylene (PE(NH₂)₂) by high-temperature melt compounding, which was suggested to lead to the formation of PA-PE block copolymers at the interface between the PE(NH₂)₂ and the PA6TI. This resulted in PA6TI/PE(NH₂)₂ blends with smaller, more uniform particle sizes than in PA6TI blended with nonfunctional PE or the commercial impact modifier, maleic anhydride-functionalized styrene–ethylene–butylene–styrene (SEBS) under the same conditions. The PA6TI/PE(NH₂)₂ blends and the corresponding glass fiber-reinforced composites consequently showed significantly greater increases in room-temperature tensile ductility and fracture energy with respect to unmodified PA6TI, as well as maintained mechanical stability at high temperatures, and only modest decreases in stiffness and strength, even at high PE(NH₂)₂ contents. These improvements were attributed to the crystallinity of the PE(NH₂)₂ particles and to improved morphological stabilization and matrix–particle adhesion, consistent with the presence of PA-PE block copolymer at the matrix–particle interfaces.

中文翻译：

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用氨基遥爪聚乙烯对半芳族聚酰胺进行热塑性增韧

半芳族聚酰胺在高级工程应用中用于金属替代，以减轻重量和提高效率，但由于其固有的延展性和韧性不足，其应用范围受到限制。在这里，我们通过高温熔融复合将半芳族聚酰胺聚（六亚甲基对苯二胺 - 共 - 间苯二胺）（PA6TI）与高达 30 wt％的胺封端聚乙烯（PE（NH 2 ） 2 ）结合，这被_认为可以_导致在 PE(NH ₂ ) ₂和 PA6TI 之间的界面处形成 PA-PE 嵌段共聚物。这导致 PA6TI/PE(NH ₂ ) ₂在相同条件下，与非功能性 PE 或商业抗冲改性剂马来酸酐功能化苯乙烯-乙烯-丁烯-苯乙烯 (SEBS) 混合的 PA6TI 相比，具有更小、更均匀的粒径。因此，与未改性的 PA6TI 相比，PA6TI/PE(NH ₂ ) ₂共混物和相应的玻璃纤维增​​强复合材料的室温拉伸延展性和断裂能显着增加，并且在高温下保持机械稳定性，并且仅即使在高 PE(NH ₂ ) ₂含量下，刚度和强度也会适度下降。这些改进归因于 PE(NH ₂ ) _{2的结晶度}颗粒并改善形态稳定性和基质-颗粒粘附，这与基质-颗粒界面处 PA-PE 嵌段共聚物的存在一致。