폴리우레탄 폼의 기계적 성능에 미치는 방사선의 영향에 대한 연구
Effect of irradiation on the mechanical performance of polyurethane foam
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조선해양산업분야에서 액화천연가스(LNG)의 수요가 상승함에 따라 LNG 운반선의 수요 역시 계속해서 증가하고있다. LNG 화물창에서의 단열 시스템은 LNG 운반선에서 가장 중요시되는 부분 중 하나로 화물창 내부의 유체에 의한정수압과 슬로싱(Sloshing)에 의한 하중을 지속적으로 받기 때문에 기계적 강도를 충분히 만족시켜야 하므로 이를 위해전 세계적으로 LNG 화물창의 단열 시스템에 적용되는 단열소재의 기계적 성능 향상을 통해 파손을 방지하고자 하는 연구와 개발이 지속적으로 활발하게 이루어지고 있다. 본 연구에서는 액화가스 운반 시 단열재로 사용되는 폴리우레탄 폼의 기계적 성능을 향상시키기 위한 연구의 일환으로, 방사선을 폴리머에 투과하면 분자구조가 변화하여 성능이 개선되는 연구를 바탕으로 폴리우레탄 폼에 사이클로트론을 이용하여 양성자를 가속화 시켜 폴리우레탄 폼의 분자 구조에 변화를 주었다. 투과된 양성자는 폴리우레탄 내부의 분자구조에 Crosslinking과 scissioning 같은 화학반응을 일으켜 결합에영향을 주고 그 결과 폴리우레탄 폼의 기계적 성능에도 영향을 주게 된다. 이에 따라 폴리우레탄 폼에 투과한 양성자의방사량에 변화를 주어 방사량에 의존한 폴리우레탄 폼의 인장시험과 전단시험을 통하여 기계적 강도를 분석 하였다.
Abstract
The recent increase in the consumption of liquefied natural gas (LNG) has led to greater demand for LNG carriers that are employed by naval and marine industries. The insulation system is one of the most important components of an LNG carrier’s cargo containment system. The insulation system is often subjected to various loading conditions such as the hydrostatic pressure of fluids inside the cargo hold and sloshing loads. Hence, developmental research is consistently being conducted at a global level for enhancing the mechanical performance of insulation materials and for preventing damage of LNG cargo containment systems. In this study, polyurethane foam was permeated with accelerated protons by cyclotron for improving its mechanical performance. Permeating protons can cause chemical reactions such as crosslinking and scissioning in polyurethane foam. It is observed that alterations in the molecular structure of polyurethane foam improve its mechanical performance. Furthermore, based on amount of permeating protons, the mechanical strength of polyurethane foam was analyzed through tensile and shear tests.
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