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2차원 나노소재를 활용한 고분자 건축자재의 난연코팅기술 개발
김한임 대한토목학회 2024 대한토목학회논문집 Vol.44 No.2
An environmentally-friendly nanocoating method that effectively adds flame retardant(FR) and gas shielding properties to combustible polymeric construction materials such as flexible polyurethane (PU) foam was studied. Naturally-driven two-dimensional(2D) nanomaterials such as graphene oxide (GO) can exhibit liquid crystalline (LC) properties in aqueous solutions, enabling uniform coatings on the various substrates including 3D-porous foams. LC phase-assisted coating serves as 3D-scaffold, facilitating the introduction of small molecules having antioxidant capabilities such as dopamine which is to form uniformly stacked FR coating. Additionally, the structural characteristics of the 2D-materials can effectively hinder the migration of toxic gases and flammable substances in the gas phase generated during combustion. This LC phase flame retardant coating technology could be a new approach to provide environmentally friendly and effective flame retardant and gas barrier properties to various types of polymeric materials.
김한임,김대우,Sergei Nazarenko,Chrisopher Ellison 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
A highly effective flame retardant (FR) nanocoating system was developed by conducting polymerization of dopamine within a liquid crystalline graphene oxide (GOLC) scaffold. The LC feature of GO enables to produce uniform coatings on multiple types of surfaces, including silicon wafer and flexible polyurethane (PU) foam that indicates this coating is potentially universal. An aqueous LC facilitates fast diffusion of dopamine within the GO scaffold where it undergoes polymerization into polydopamine (PDA). PDA/GO exhibited a highly efficient FR performance of PU foam, which can be attributed to the synergistic interplay afforded by its anti-oxidative and intumescent char formation functions of PDA/GO. This nanocoating does not substantially influence the mechanical properties of PU foam, and exhibited significantly enhanced water stability promoted by the adhesive character of PDA and the hydrophobic reduced GO form by PDA.