• Title, Summary, Keyword: Glycidyl azide polymer copolymer

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Synthesis and Characterization of Alkoxy and Alkylamino GAP Copolymer for Energetic Thermoplastic Elastomer (ETPE) (에너지화 열가소성 탄성체에 사용될 수 있는 알콕시 계열과 알킬 아민 계열 GAP Copolymer의 합성 및 분석)

  • Lim, Minkyung;Jang, Yoorim;Kim, Hancheul;Rhee, Hakjune;Noh, Sitae
    • Applied Chemistry for Engineering
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    • v.30 no.1
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    • pp.81-87
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    • 2019
  • In this study, synthetic methods and physical properties for a new class of glycidyl azide polymer (GAP) were investigated for energetic thermoplastic elastomers (ETPE). Four kinds of GAP copolymer polyols were synthesized by introducing nucleophiles such as azide, alkoxide and alkyl amine into poly(epichlorohydrin) (PECH). The GAP copolymer synthetic reaction can be evaluated as an environmental benign and efficient synthetic method due to the simultaneous one-step reaction using two kinds of nucleophiles and the complete consumption of sodium azide. The relative stoichiometric substitution ratio analysis and the progress of reaction were checked and monitored by inverse gated decoupled $^{13}C$ NMR and Fourier transform infrared (FT-IR) spectroscopy. The glass transition temperature and molecular weight were measured by differential scanning calorimetry (DSC) and gel permeation chromatography (GPC) analysis. The synthesized poly($GA_{0.8}-butoxide_{0.2}$), poly($GA_{0.7}-n-butylamine_{0.3}$), poly($GA_{0.7}-dipropylamine_{0.3}$) and poly($GA_{0.7}-morpholine_{0.3}$) had a glass transition temperature ranged from -39 to $-26^{\circ}C$.

Synthesis of Poly(glycidyl azide-co-glycidyl ferrocenyl ether) (Poly(glycidyl azide-co-glycidyl ferrocenyl ether)의 합성)

  • Jung, Haeji
    • Journal of the Korea Institute of Military Science and Technology
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    • v.22 no.1
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    • pp.35-41
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    • 2019
  • 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 $^{13}C$ 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 ($T_g$) of the GAFPs shifted to a higher temperature, and the decomposition temperature ($T_d$) decreased because the ferrocene worked as a burning rate catalyst.

Synthesis and Characterization of GAP or GAP-co-BO Copolymer-based Energetic Thermoplastic Polyurethane (GAP 및 GAP-co-BO Copolymer계 에너지 함유 열가소성 폴리우레탄의 합성 및 특성)

  • Seol, Yang-Ho;Kweon, Jeong-Ohk;Kim, Yong-Jin;Jin, Yong-Hyun;Noh, Si-Tae
    • Applied Chemistry for Engineering
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    • v.30 no.6
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    • pp.673-680
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    • 2019
  • GAP or GAP-co-BO based energetic thermoplastic elastomers (ETPEs) were synthesized by changing the hard segment content percent in the range of 30~45% by 5% difference. Thermal and mechanical properties of GAP-co-BO based ETPEs were compared to those of GAP based ETPEs. FT-IR results showed that the capability of forming hydrogen bond increases with increasing the hard segment content in GAP/GAP-co-BO based ETPE, and also the GAP-co-BO based ETPEs are stronger than GAP based ETPEs in the hydrogen bond formation. DSC and DMA results showed that the glass transition temperature (Tg) of GAP based ETPEs increased with the increment of the hard segment content, while the Tg of GAP-co-BO based ETPEs was maintained even the hard segment content increased. The storage modulus at room temperature of the GAP-co-BO based ETPEs was higher than that of the GAP based ETPEs. This was due to the strong phase separation behavior of the hard and soft segment of GAP-co-BO based ETPEs, which further resulted in the stronger breaking strength and lower tensile elongation at break point for GAP-co-BO based ETPE than the GAP based one.