共查询到18条相似文献,搜索用时 109 毫秒
1.
组装了一套用于测定含能物质的爆燃延迟期的装置,在507~547K和0.1~9.1MPa下研究了六硝基六氮杂异伍兹烷(HNIW)的爆燃延迟期τ,温度升高使爆燃延迟期τ缩短。在507K和517K温度下,高压(≥5MPa)使爆燃延迟期τ增加;在527K和537K下,压力使爆燃延迟期τ缩短。计算了不同压力下的动力学参数,HNIW的爆燃反应活化能随压力增加而增加,研究了不同温度(≤489K)和压力下HNIW的热分解,压力对HNIW的热分解具有抑制作用。 相似文献
2.
3.
溶剂及温度对ε-HNIW晶型及热安定性的影响 总被引:6,自引:3,他引:6
将ε-HNIW分别在水、甲苯、正庚烷、环己烷4种溶剂中于70℃下加热4h后进行傅立叶变换红外光谱(FTIR)测定及差热分析(DTA)。FTIR图谱表明,加热后的ε-HNIW谱图与未经加热的一致,即加热后的HNIW仍为ε型。DTA曲线显示,在2,5,10及20℃/min的升温速率下,加热4h后ε-HNIW的分解峰温与未加热的峰温的改变量ΔTP分别为0~2.6℃、0~2.6℃、1~1.9℃及0~2.5℃。用Kissinger法和Ozawa法对热分解曲线进行热分解唯象动力学处理,求得4种加热后试样的分解表观活化能,且两种方法计算出的结果误差在2%以内。可以认为,ε-HNIW在上述溶剂中于70℃下加热4h后,热安定性没有改变。 相似文献
4.
5.
6.
7.
8.
9.
用支化水性聚氨酯包覆HNIW的研究 总被引:3,自引:0,他引:3
以甲苯二异氰酸酯(TDI)、聚氧化丙烯多元醇(TDB-2000和TMN-450)、双羟甲基丙酸(DMPA)和丁二醇(BDO)为原料,采用丙酮回流法合成了硬段质量分数为45%的支化水性聚氨酯(WBPU),用FT-IR、^1HNMR及DSC对所得产物进行表征。FTIR和^1HNMR图谱显示,所得产物为目标化合物;DSC测试结果显示,合成的支化水性聚氨酯树脂在299℃和380℃出现分解吸热双峰;SEM和FT-Raman光谱显示,制备的支化水性聚氨酯乳液采用破乳法对六硝基六氮杂异伍兹烷(HNIW)进行了包覆;撞击感度试验显示,HNIW包覆后的特性落高由25.1cm提高到31.6cm,表明支化性聚氨酯能降低HNIW的冲击感度。 相似文献
10.
用差示扫描量热法(DSC)研究了六硝基六氮杂异伍兹烷(HINW,CL–20)、黑索今(RDX)及CL–20/RDX混合体系的热分解行为,分别用Kissinger法和Ozawa法计算了热分解动力学参数。结果表明:RDX的存在,降低了CL–20的分解峰温;2种动力学计算结果相近,均显示出RDX的存在降低了CL–20表观活化能。 相似文献
11.
以 X射线衍射仪测得的晶体学数据计算了六硝基六氮异伍兹烷的四种晶型 (α- HNIW1/ 2 H2 O,β- HNIW,γ- HNIW和 ε- HNIW)的晶体密度 ,同时根据 GJB772 A- 97,40 1.1所规定的密度瓶法实测了上述四者的密度。计算值分别为 1.992 g/ cm3 、1.989g/ cm3 、1.918g/ cm3 及 2 .0 44 g/ cm3 ,实测值分别为 1.937g/ cm3 、1.983g/ cm3 、1.918g/ cm3 及 2 .0 35 g/ cm3 ,计算值比实测值分别高 0 .0 5 5 g/ cm3 、0 .0 0 6g/ cm3 、0 g/ cm3 及 0 .0 0 9g/ cm2 。 相似文献
12.
通过四氯化钛与酒石酸反应,制得了新的固态配合物Ti2O2(OH)2C4H4O6·3H2O。用元素分析、X-射线粉末衍射,IR和TG分析确定了产物的组成。TG和DSC研究了它在空气氛围下的热分解特性,计算机求解热分解反应各阶段的活化能Ea,反应级数n、焓变面△rH和熵变面△rS。在550℃灼烧1小时,可得锐钛型TiO2。 相似文献
13.
J. Kimura 《Propellants, Explosives, Pyrotechnics》1989,14(3):89-92
Measurements of chemiluminescence (CL) during heating of nitrate esters (PETN and NC) have been conducted in the temperature range between 40 °C and 90 °C in an inert atmosphere. Faint light was emitted from the condensed-phase in steady-state fashion. This new finding implies that the thermal decomposition of nitrate esters is accompanied by some oxidation reactions. Spectral analysis of the CL showed that the light-emitting species will be the first excited triplet of carbonyl-containing products and singlet oxygen. The low-temperature CL phenomena observed for PETN and NC are represented by Arrhenius law, providing the activation energy of 63 kJ/mol (= 15 kcal/mol). Kinetic analysis of the CL has led to the result that the formation of peroxy radicals, which can be produced by oxidation of the primary products of nitrate ester bond (RO NO2) cleavage, predominates a consecutive series of radical reactions of the CL. 相似文献
14.
红外光谱联用技术在材料热分解研究中的应用 总被引:1,自引:0,他引:1
介绍了傅里叶变换红外光谱技术和固体原位反应技术、快速热裂解原位反应技术以及热分析技术的联用在实时监测材料受热分解过程中凝聚相中间产物、终态产物和气相产物的组成以及分解起始温度点和温度范围方面的应用,提供了一种切实可行的材料热分解机理研究方法。 相似文献
15.
Kinetics of the thermal decomposition of pentaerythritol tetranitrate (PETN) in condensed state has been investigated by high temperature infrared spectroscopy (IR) and thermogravimetry (TG) in conjunction with pyrolysis gas analysis, differential thermal analysis (DTA) and hot-stage microscopy. Kinetics of thermolysis has been followed by IR after suppressing volatilization by matrixing and by isothermal TG without suppressing volatilization to simulate actual user conditions. The best linearity was obtained for Avrami-Erofe'ev equation, n=1, in IR and isothermal TG. Activation energy was found to be 152 kJ mol−1 and log A (in s−1) 16.96 by IR. The effect of additives on the initial thermolysis of PETN has been studied. Evolved gas analysis by IR shows that NO2, H2CO are produced in the initial stage of decomposition followed by NO, N2O, CO2, HCN and H2O. The decomposition in KBr matrix shows relative preferential loss in NO2 band intensity which indicates that the rupture of O−NO2 bond is the primary step in the thermolysis of PETN. 相似文献
16.
L. N. Ignat'eva S. A. Polishchuk T. F. Antokhina V. M. Buznik 《Glass Physics and Chemistry》2004,30(2):139-141
A series of glasses in the TiO2–BaF2–MnF2 system is synthesized and studied by IR spectroscopy. Possible models of structural fragments of oxyfluorotitanate glasses are proposed. 相似文献
17.
P. K. GALLAGHER D. W. JOHNSON F. SCHREY 《Journal of the American Ceramic Society》1970,53(12):666-670
Conventional thermogravimetry, differential thermal analysis, and evolved gas analysis were used to study the thermal decomposition of reagent-grade FeSO4 ·7H2 O and of freeze-dried FeSO4 ·H2 O in oxidizing and inert atmospheres. The mechanism depends on the atmosphere but is the same for the freeze-dried and conventional materials. In oxygen, iron(II) is converted to iron(III) before the sulfate ion decomposes, whereas in nitrogen this conversion occurs simultaneously with the first step of the sulfate decomposition. The presence of moisture lowers the decomposition temperature. Moess-bauer spectroscopy, X-ray diffraction data, and surface area measurements substantiated the proposed decomposition schemes. 相似文献
18.
采用热重法对聚苯乙烯(PS进)行了热分解动力学研究。结果表明:PS呈两段热解,主要发生在340~520℃区间,在该范围内,PS在400~444℃达到最大热解速率;随着升温速率的增加,其最大热解速率对应的峰温有所升高,热解起始、终止温度也相应提高,但最终质量分数基本一致,为4.4%~4.8%。采用等转化率法和比较法求解得到PS热解过程的动力学三因子,其活化能为136.76kJ/mol,指前因子lnA为26~28,动力学机理函数的积分形式为。用反应模型对实验数据进行了模拟,模拟准确度很高,标准偏差为0.048。 相似文献