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Title: Large toughening effect in biomimetic geopolymer composites via interface engineered 3D skeleton
Authors: Chen, Xuelong
Lim, Jacob Song Kiat
Liang, Yen Nan
Zhang, Liying
Hu, Xiao
Keywords: Engineering::Environmental engineering
Issue Date: 2018
Source: Chen, X., Lim, J. S. K., Liang, Y. N., Zhang, L., & Hu, X. (2019). Large toughening effect in biomimetic geopolymer composites via interface engineered 3D skeleton. ACS Sustainable Chemistry & Engineering, 7(1), 105-110. doi:10.1021/acssuschemeng.8b05090
Journal: ACS Sustainable Chemistry & Engineering
Abstract: Green and eco-friendly geopolymers with high thermal/acid resistance represent potential candidates for the replacement of traditional Portland cement in construction, as well as many other applications; however, the intrinsic brittleness and low toughness typical of ceramic hinders widespread adoption of this material in various applications. In this work, we fabricated a new type of geopolymer composites by impregnated with interface engineered 3D skeleton resembling the lotus root structure. Highly porous melamine foam was selected as the 3D skeleton and its interior surface was coated with elastomeric polydimethylsiloxane–polyurea block copolymer. Under loading, the interfacial elastomer could deform and absorb large amount of energy concurrently with crack deflection of melamine foam and delamination of interfaces, thus the toughness was substantially improved as results indicated a transition of fracture behavior from brittle failure mode to a more ductile one. With as low as 2.5 wt % elastomer, the fracture toughness and work of fracture were increased by 258% and 654%, respectively. Owing to the three-dimensional reinforcement preform, the issue with dispersion of reinforcing fillers is circumvented. The obtained geopolymer composites with enhanced toughness allow for applications requiring high load capacity. This strategy of manufacturing composites through 3D skeleton opens new pathway to improving mechanical performance of various brittle materials and material processing techniques.
ISSN: 2168-0485
DOI: 10.1021/acssuschemeng.8b05090
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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