Akademik Veri Yönetim Sistemi
Tezin Türü: Doktora
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye
Tezin Onay Tarihi: 2017
Öğrenci: TUĞBA KAYA DENİZ
Danışman: ÖZDEMİR DOĞAN
Özet:Motor case of a rocket/missile system is exposed to hot and high pressure gases. Its structural components such as control surfaces, outer casing are exposed to mechanical loads and aerodynamic heating due to the high velocity of the system. Therefore reinforced resin matrix polymeric composite materials are needed. These materials are applied inside and outside of the rocket/missile system in order to resist the aforementioned conditions. Considering the increasing difficulties in design criteria, rocket/missile systems that can carry its mission in harsh environments should be manufactured. This necessitates resins that possess advanced thermal and mechanical properties and high Tg than the currently used composite materials. Due to their strategic importance for the defense industry, international treaties limit importing these resins from other countries. In this thesis, fiber/fabric reinforced composite materials were manufactured from benzoxazine derivatives. The manufactured composite materials were confirmed by accomplishing laboratory scale thermal and mechanical tests. Synthesis of benzoxazine monomers was achieved in high yields under optimized reaction conditions by using phenol, aldehyde and amine derivatives. The characterization of these compounds was made via NMR and FTIR). Polymerization of these monomers was studied under appropriate curing conditions. The thermal and mechanical properties of obtained thermoset materials were examined. The composite materials were manufactured from these resins, which possessed desired thermal and mechanical properties (char yield %30, Tg 150 C).