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김성황,박수진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Nanodiamond (ND) surfaces were successfully modified using the ozone treatment and tetraethylenepentamine (TEPA) solution for use as reinforcement in epoxy nanocomposites. The main purpose of the project was to introduce ozone/TEPA-functionalized NDs within the epoxy matrix to enhance its mechanical properties by improving dispersion and interfacial adhesion. To evaluate the efficacy of the proposed method, epoxy composite specimens reinforced with NDs are prepared at different weight contents of nanoparticles along with three other types of NDs (pristine ND, ozone-functionalized ND, and ozone/TEPA-functionalized ND). For the all nanocomposites developed in this work, the ND contents were found to be optimal at 0.50 wt%. The related ND reinforcing mechanisms were evaluated based on a polished cross-sectional and fracture surface analysis.
Ozonization of SWCNTs on thermal/mechanical properties of basalt fiber-reinforced composites
김성황,허영정,박수진 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.5
To move forward in large steps rather than in small increments, the community would benefit from a systematic and comprehensive database of multi-scale composites and measured properties, driven by comprehensive studies with a full range of types of fiber-reinforced polymers. The multi-scale hierarchy is a promising chemical approach that provides superior performance in synergistically integrated microstructured fibers and nanostructured materials in composite applications. Achieving high-efficiency thermal conductivity and mechanical properties with a simple surface treatment on single-walled carbon nanotubes (SWCNTs) is important for multi-scale composites. The main purpose of the project is to introduce ozone-treated SWCNTs between an epoxy matrix and basalt fibers to improve mechanical properties and thermal conductivity by enhancing dispersion and interfacial adhesion. The obvious advantage of this approach is that it is much more effective than the conventional approach at improving the thermal conductivity and mechanical properties of materials under an equivalent load, and shows particularly significant improvement for high loads. Such an effort could accelerate the conversion of multi-scale composites into high performance materials and provide more rational guidance and fundamental understanding towards realizing the theoretical limits of thermal and mechanical properties.
김성황,박수진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
A graphitic nanofiber (GNF) surface was successfully modified using the dry-ozone treatment for use as the reinforcement for carbon fiber-reinforced composites (CFRPs). To evaluate the efficacy of the proposed method, CFRPs are fabricated at different weight contents along with two other types of composites (pristine GNFs and dry-ozonized GNFs). We denoted the specimens of GNF/CF/epoxy composites and OGNF/CF/epoxy composites as GCE and OGCE composites, respectively. The mechanical properties including ILSS and KIC were studied for composites to evaluate their efficiency. The measured highest ILSS and KIC value reached 34.2 MPa and 55.4 MPa.m<sup>1/2</sup> in the 0.8 wt% OGCE composites, equating to enhancements of 22.6 and 14.2% compared to the 0.8 wt% GCE composites.