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- 저자 : Shijin Chu (검색결과 2 건)
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Bo Jin,Juan Shen,Rufang Peng,Yuanjie Shu,Shijin Chu,Haishan Dong 한국고분자학회 2014 Macromolecular Research Vol.22 No.2
A new energetic polymer, poly(vinyl 2,4,6-trinitrophenylacetal)-co-poly(vinyl acetate azide) (PVTNP-co-PVAA), was synthesized by a two-step process involving initial chloroacetylation and subsequent azidation of poly(vinyl2,4,6-trinitrophenylaceta). The synthesized polymers were characterized by elemental analysis, UV-Vis, ATR-FTIR, and1H NMR techniques. The glass-transition temperature of PVTNP-co-PVAA was evaluated by differential scanningcalorimetry (DSC), and the thermal stability of PVTNP-co-PVAA was tested by differential thermal analysis (DTA)and thermogravimetric analysis (TGA). DSC traces showed that PVTNP-co-PVAA had two glass-transition temperaturesat -27.53 and 67.05 ℃, respectively. DTA and TGA curves showed that the thermo-oxidative degradation ofPVTNP-co-PVAA in air was a two-step reaction, and the percentage of degraded PVTNP-co-PVAA reached nearly100% at 600 oC.
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Preparation and Thermal Performance of Fullerene-Based Lead Salt
Hui-Juan Guan,Rufang Peng,Bo Jin,Hua Liang,Fengqi Zhao,Xing-Bing Bu,Wen-Jing Han,Shijin Chu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
C60 is widely investigated because of its unique structure. But its applications in solid propellant seem to be relatively neglected. C60 has more outstanding features than carbon black which is widely used as a catalyst ingredient of solid propellant. To combine the advantages of fullerene and lead salts, another good composite in propellant catalysts, we synthesized a kind of fullerene phenylalanine lead salt (FPL) and explored its thermal performances by differential thermal analysis (DTA) and thermogravimetry analysis (TGA). The results show it undergoes four exothermic processes started from 408 K. Combined TGA and X-ray diffractometer (XRD), the decomposition mechanism of FPL was derived by TG-IR and comparing IR spectra of FPL and its residues after burned to 327 °C, 376 °C and 424 °C, respectively. Effect of FPL on the decomposition characteristic of hexogen (RDX), a type of explosive in propellant, has been investigated using DTA at different heating rate, which shows the decomposition temperatures of the explosive are all reduced by more than 20 K. The corresponding activation energy (Ea) is decreased by 30 kJ·mol−1. So FPL has potential application as a combustion catalyst in solid propellant.
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