The pursuit of multifunctional plastic additives continues to be a critical imperative in order to meet the increasing demands of practical applications. However, developing additives with nucleation, antibacterial, and antiaging properties still faces many challenges. In this study, a multifunctional hindered amine substituted aromatic diamide, N,N′-bis(4-amino-2,2,6,6-tetramethylpiperidinyl)-1,4-benzenedicarboxamide (NBT), was synthesized and blended with polypropylene (PP) through melting extrusion. The crystallization temperature of PP increased from 116 °C (neat PP) to 123 °C (1% NBT addition). Additionally, the crystallization rate and relative crystallinity of PP were significantly increased by the introduction of the as-synthesized nucleation agent. The hindered amine structure of the additive can effectively prevent the ultraviolet aging of polypropylene. Abundant amino and amide groups on NBT can be easily changed to N-chlorine by household bleach, endowing materials with renewable antibacterial properties. The chlorinated NBT-modified PP sheets were able to kill 10^5–6 CFU/mL of Escherichia coli and Staphylococcus aureus within 60 min. The PP/NBT composites with regenerating antibacterial properties will have major potential for application in food packaging, filters, and hygienic products.

中文翻译：

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芳香酰胺基受阻胺衍生物作为聚丙烯的有效成核剂，具有抗老化和可充电抗菌性能

为了满足实际应用日益增长的需求，追求多功能塑料添加剂仍然是当务之急。然而，开发具有成核、抗菌和抗老化性能的添加剂仍面临许多挑战。本研究合成了一种多功能受阻胺取代芳香二酰胺N , N'-双(4-氨基-2,2,6,6-四甲基哌啶基)-1,4-苯二甲酰胺(NBT),并与聚丙烯共混。 PP）通过熔融挤出。 PP 的结晶温度从 116 °C（纯 PP）增加到 123 °C（添加 1% NBT）。此外，通过引入合成的成核剂，PP的结晶速率和相对结晶度显着提高。该添加剂的受阻胺结构可有效防止聚丙烯的紫外线老化。 NBT 上丰富的氨基和酰胺基团可以很容易地通过家用漂白剂转变为N-氯，从而赋予材料可再生的抗菌性能。氯化NBT改性PP片材能够在60分钟内杀死10 ^5–6 CFU/mL的大肠杆菌和金黄色葡萄球菌。具有再生抗菌性能的PP/NBT复合材料将在食品包装、过滤器和卫生产品方面具有巨大的应用潜力。