Physical loss of stabilizers by migration and extraction accelerates the degradation of polymer materials. In this work, amino-containing nanosilica with anti-aging properties was prepared simply by the co-condensation of tetraethoxysilane and N-(2-aminoethyl)-3-aminoproply-trimethoxysilane (AEAPS). AEAPS was used to introduce amino groups into silica nanoparticles and to act as a catalyst in this process. The co-condensed nanosilica (CCS) showed agglomerate structure similar to the typical fumed nanosilica (FS). The amino groups were distributed both on the surface and inside the nanoparticles. HDPE/CCS and HDPE/FS composites were prepared by melt blending. Thermogravimetric analysis and oxidative induction time showed that CCS has effectively improved the thermo-oxidative stability of HDPE. In the long-term accelerated thermo-oxidative aging and UV aging tests, HDPE/CCS composite showed superior stability to neat HDPE and HDPE/FS composite. The results of infrared spectroscopy and electron paramagnetic resonance suggested that the HDPE/CCS composite manifested a special degradation mechanism involving the nucleophilic addition of amino groups to carbonyl species as well as the oxidation of amino groups on CCS by peroxides. The amino groups on CCS consumed carbonyl species and peroxides, and generated hydroxylamines and nitroxide radicals which were able to eliminate free radicals, thus restrained the degradation of HDPE.

稳定剂由于迁移和萃取而物理损失，加速了聚合物材料的降解。在这项工作中，只需通过四乙氧基硅烷和N的共缩合即可制备具有抗老化性能的含氨基纳米二氧化硅-（2-氨基乙基）-3-氨基丙基三甲氧基硅烷（AEAPS）。AEAPS用于将氨基引入二氧化硅纳米颗粒中，并在此过程中充当催化剂。共凝聚纳米二氧化硅（CCS）显示出类似于典型气相纳米二氧化硅（FS）的团聚结构。氨基分布在纳米颗粒的表面和内部。HDPE / CCS和HDPE / FS复合材料是通过熔融共混制备的。热重分析和氧化诱导时间表明，CCS有效地改善了HDPE的热氧化稳定性。在长期加速的热氧化老化和紫外线老化测试中，HDPE / CCS复合材料显示出优于纯净HDPE和HDPE / FS复合材料的稳定性。红外光谱和电子顺磁共振的结果表明，HDPE / CCS复合材料表现出一种特殊的降解机理，涉及氨基向羰基物种的亲核加成以及过氧化物对CCS上氨基的氧化。CCS上的氨基消耗了羰基物质和过氧化物，并生成了能够消除自由基的羟胺和氮氧化物自由基，从而抑制了HDPE的降解。