Details

Autor(en) / Beteiligte

• Ji, Xiaoping
• Wang, Siqi
• Yao, Bingchen
• Si, Wei
• Wang, Chaohui
• Wu, Tongda
• Zhang, Xueyuan

Titel

Preparation and properties of nano-SiO2 modified microcapsules for asphalt pavement

Ist Teil von

• Materials & design, 2023-05, Vol.229, p.111871, Article 111871

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• [Display omitted] •Optimal preparation parameters of nano-SiO2 modified microcapsules are recommended.•The core content in nano-SiO2 modified microcapsules is up to 85.39 %.•Nano-SiO2 modified microcapsules improve strength at least 1.4 times and thermal stability 2.9 times. This paper presents nano-SiO2 modified microcapsules prepared by in-situ polymerization to improve their performance. Low-quality vegetable oil was selected as the main material and Melamine Urea Formaldehyde (MUF) modified by nano-SiO2 was selected as the shell material. Firstly, the optimal preparation parameters of the nano-SiO2 modified microcapsules were determined, including the emulsifier type, emulsifier concentration, emulsifier shearing speed, the core-shell ratio, reaction pH, reaction temperature, and nano-SiO2 content, respectively, by using the Scanning Electronic Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Thermo-Gravimetric analysis (TGA) and nanoindentation test, etc. Secondly, the properties of the prepared microcapsules were evaluated. The particle size of the prepared nano-SiO2 modified microcapsules was ∼ 78–96 μm, and the average size was 88.16 μm. The average core content was 85.39 %, which exceeds the upper limit of 80 % of existing microcapsules. The nano-hardness and Young’s modulus were 0.33 and 2.63 GPa, respectively, improved by at least 1.4 times compared to existing microcapsules. The mass loss of microcapsules was 0.95 % at 182.73 °C, which is at least 2.9 times higher than the thermal stability of existing microcapsules. The results showed that the addition of nano-SiO2 can obviously improve the performance of microcapsules.