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Poly(glycidyl azide-co-glycidyl ferrocenyl ether)의 합성
정해지 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.1
Ferrocene and ferrocene derivatives have been widely used as a burning rate catalyst for composite solid propellants. However, its tendency to migrate through the propellant grain and to crystallize at the surface changes the composition of propellant which results in unpredictable burning rate. To overcome the weakness of ferrocene catalyst, we designed a polymer containing ferrocene, poly(glycidyl azide-co-glycidyl ferrocenyl ether) (GAFP). GAFPs were synthesized from poly(epichlorohydrin-co-glycidyl ferrocenyl ether) (PEGF) which has ferrocenyl ethers in its pendant groups. The structures of GAFPs were confirmed by FT-IR, 1H and 13C NMR spectral analyses. Thermal properties of the GAFPs were evaluated using differential scanning calorimeter (DSC). As the contents of ferrocene increased, the glass transition temperature (Tg) of the GAFPs shifted to a higher temperature, and the decomposition temperature (Td) decreased because the ferrocene worked as a burning rate catalyst.
정해지 ( Hae-ji Jeong ),김혜리 ( Hae-ri Kim ) 21세기영어영문학회 2021 영어영문학21 Vol.34 No.2
This paper aims to understand the effect of English picture books as language input sources in dramatization activities and to explore how small-group dramatization activities have an effect on the cultivation of community competence. The result of the study emerged in two steps. First, in dramatization activities, picture books served as a source of language input and had a positive effect on developing learners’ English communicative skills. Learners also expanded their vocabulary and better understood their dramatization topics and contents by reading picture books. Second, the small-group dramatization activity had a positive effect on the cultivation of community competence. Small-group work had a positive effect on the improvement of interpersonal skills and the ability to maintain relationships, and overcome conflicts. Based on the results, some suggestions for future studies are provided.