Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 12, Pages 2996-3003Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc04873d
Keywords
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Science, ICT & Future Planning [NRF-2014M3C1B2048175, 2016R1A2B1007134, NRF-2017R1A2B4006091]
- Ministry of Trade, Industry and Energy (MOTIE) [10067690]
- US National Science Foundation [1545875]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067690] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In the development of three-dimensional printable materials for high-speed and high-resolution printing, UV-curing polymers can guarantee fast and precise printing of high performance load-bearing structures, but the injected drops of the monomers tend to spread over the substrates due to their low viscosity. In this study, we imposed the self-standing and shape-memorable capability of an epoxy acrylate (EA) monomer to ensure continuous filamentary 3D printing while maintaining its low viscosity nature. Using octadecanamide (ODA) with EA, strong hydrogen-bond networks (-N-H center dot center dot center dot O=C-N-C=O center dot center dot center dot H-O-, -N-H center dot center dot center dot N-) were additionally achieved in the material system and the developed material distinctively exhibited rheological duality at different processing stages: a low-viscosity liquid-like behavior (viscosity of B50 Pa) while passing through the nozzle and a self-standing solid-like behavior (static yield stress of B364 Pa) right after being printed. This reversible liquid-to-solid transitional capability was quantified by viscoelastic complex moduli provided a dynamic yield stress (ty, G) of 210 Pa corresponding to the upright stacking up to B3.2 cm (3 wt% of ODA). The time (ty, G) required for conformational rearrangement was evaluated to be as fast as B10 similar to 2 s. After UV curing, the 3D printed layers exhibited no air pockets or weld lines at the stacked interfaces, which could guarantee excellent mechanical performance and structural integrity.
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