Preparation and characterization of self-healing microcapsules with poly(urea-formaldehyde) grafted epoxy functional group shell

2009 ◽  
Vol 113 (3) ◽  
pp. 1501-1506 ◽  
Author(s):  
Rongguo Wang ◽  
Haiyan Li ◽  
Honglin Hu ◽  
Xiaodong He ◽  
Wenbo Liu
Keyword(s):  
Functional Group ◽  
Urea Formaldehyde ◽  
Self Healing

Preparation and characterization of self-healing poly (urea-formaldehyde) microcapsules

2007 ◽  
Author(s):  
Haiyan Li ◽  
Rongguo Wang ◽  
Xiaodong He ◽  
Wenbo Liu ◽  
Huanying Hao
Keyword(s):  
Urea Formaldehyde ◽  
Self Healing

Preparation and Characterization of Microcapsules for Self-Healing Material

2012 ◽  
Vol 430-432 ◽  
pp. 960-963 ◽  
Author(s):  
Wan Peng Ma ◽  
Wei Zhang ◽  
Yang Zhao ◽  
Le Ping Liao ◽  
Si Jie Wang
Keyword(s):  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Self Healing ◽  
Water Emulsion ◽  
Good Thermal Stability ◽  
Oil In Water ◽  
Inner Surface ◽  
Oil In Water Emulsion

Urea-formaldehyde microcapsules containing epoxy resin is a promising material for self-healing design. The microcapsules were prepared by in-situ polymerization in an oil-in-water emulsion. The microcapsule formation process was monitored using optical microscopy. Surface morphology was observed using field emission scanning electron microscopy. The thermal property of microcapsules was characterized using thermogravimetric analysis. The results indicate that microcapsule wall has a rough outer surface and a smooth inner surface. The microcapsule size is controlled by different agitation rates. Microcapsules have a good thermal stability below 157°C.

scholarly journals Characterization of Steel Slag Filler and Its Effect on Aging Resistance of Asphalt Mastic with Various Aging Methods

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 869
Author(s):  
Minghua Wei ◽  
Shaopeng Wu ◽  
Haiqin Xu ◽  
Hechuan Li ◽  
Chao Yang
Keyword(s):  
Particle Size ◽  
Surface Characterization ◽  
Steel Slag ◽  
Self Healing ◽  
Limestone Filler ◽  
Asphalt Mastic ◽  
Pore Characterization ◽  
Asphalt Mastics ◽  
Healing Property

Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag. The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods. Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared. Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated. Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers. The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially. In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics. In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic.

Preparation and characterization of double network hydrogel with high-strength and self-healing

2021 ◽  
pp. 102450
Author(s):  
Shubin Li ◽  
Xiao Wang ◽  
Jiang Zhu ◽  
Zhenyu Wang ◽  
Lu Wang
Keyword(s):  
High Strength ◽  
Self Healing ◽  
Double Network
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