Silica microcapsules containing waste soybean cooking oil with enhanced thermal stability, environmental resistance, and sustained-release for superior bitumen anti-aging performance

IF 7.4 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-09-11 DOI:10.1016/j.polymdegradstab.2025.111667

Peng Yang , Xiao-Nan Su , Jun-Feng Su , Qin-Yu Xing , Xin-Yu Wang , Qian Sun , Zhi-Yong Tan

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引用次数: 0

Abstract

Bitumen oxidative aging leads to pavement deterioration through increased stiffness and cracking, necessitating effective rejuvenation strategies. Current approaches utilizing waste soybean cooking oil (WSCO) are limited by rapid evaporation and leaching. This study presents an innovative solution through silica microencapsulation of waste soybean cooking oil (microWSCOs) synthesized via optimized oil-in-water emulsion with tetraethyl orthosilicate. The microcapsules exhibit uniform spherical morphology (10–50 μm diameter) with high encapsulation efficiency (92±3 %) and thermal stability (<5 % mass loss at 180 °C for 2 h). Controlled release kinetics under simulated traffic loading (0.7 MPa, 10 Hz) demonstrate 62.4 ± 2.1 % cumulative rejuvenator release after 10,000 cycles, effectively restoring aged bitumen properties: softening point reduction of 15.2 ± 0.8 °C, penetration increase of 28.3 ± 1.5 %, and complex modulus decrease of 34.7 ± 2.3 %. Environmental resistance testing reveals 89.2 ± 3.5 % WSCO retention following 500 h UV irradiation (0.89 W/m²) and 7-day water immersion. The microencapsulation system demonstrates dual sustainability benefits by valorizing waste oil while significantly extending pavement service life through targeted, long-term rejuvenation.

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含有废大豆油的二氧化硅微胶囊，具有增强的热稳定性、耐环境性和缓释性，具有优越的沥青抗老化性能

沥青氧化老化通过增加刚度和裂缝导致路面恶化，需要有效的再生策略。目前利用废豆油（WSCO）的方法受到快速蒸发和浸出的限制。以正硅酸四乙酯为原料，对经优化的水包油乳液合成的废大豆油进行了二氧化硅微胶囊化处理。微胶囊具有均匀的球形形貌（直径10 ~ 50 μm），包封效率（92±3%）和热稳定性（180℃保温2 h时质量损失<； 5%）。模拟交通荷载（0.7 MPa, 10 Hz）下的控释动力学表明，经过1万次循环后，再生剂的累积释放量为62.4±2.1%，有效恢复了老化沥青的性能：软化点降低15.2±0.8°C，渗透提高28.3±1.5%，复合模量降低34.7±2.3%。环境抗性测试表明，500小时紫外线照射（0.89 W/m²）和7天水浸泡后，WSCO保留率为89.2±3.5%。微胶囊化系统通过对废油进行增值，同时通过有针对性的长期修复，显著延长了路面的使用寿命，从而展示了双重可持续性效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.