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191.
小型密闭压力容器测试(MCPVT)法是安全工程领域中近几年发展起来的、评价有机过氧化物及自反应物质受热分解反应激烈程度的新方法。pmax是MCPVT方法中用来表征自反应物质受热分解反应激烈程度的物理量之一。文中通过大量实验,研究了样品容器容积V、升温速率R及样品质量M对pmax重复性误差的影响,研究了一系列典型的有机过氧化物和自反应物质在标准实验条件下pmax重复性误差。结果表明,小型密闭压力容器测试系统重复性好,测试结果可靠,从而为MCPVT法最终成为国际上评价自反应物质受热分解反应激烈程度标准方法奠定了基础。 相似文献
192.
The effect of a range of organic additives on the thermal stability of poly(vinyl chloride), both with and without a chloroparaffin extender, was studied using a number of experimental techniques. Of the additives used the best overall balance was provided by pentaerythritol, which increased stability when the extender was present and had no effect when it was absent. The congo red test emerged as the most suitable technique, being consistent and inexpensive and able to screen several additives simultaneously. Isothermal differential thermal analysis correlated with the congo red test but required more expensive equipment, was time-consuming and demanded good mixing of the poly(vinyl chloride) compound to give reproducible results. Thermogravimetry was not sufficiently sensitive and the heat stability test was the least useful of all. 相似文献
193.
Temperature dependences of shrinkage forces appearing in oriented polymer samples when heated at constant length were recorded for polycarbonate, polyethylene terephthalate, polyethylene and polypropylene. The influence of various processing conditions on thermally stimulated shrinkage forces is demonstrated. A four-state model is proposed which qualitatively describes the temperature dependences of shrinkage forces in amorphous polymers. 相似文献
194.
C. N. Cacaval E. C. BuruianÎ D. Rou E. Rusu G. E. Grigoriu V. Brboiu 《Polymer International》1985,17(4):343-346
Thermogravimetry and pyrolysis in combination with gas chromatography and infrared spectroscopy were the experimental techniques applied to the thermal degradation of cinnamoylated poly(vinyl alcohol) samples, constituted from vinyl alcohol-vinyl cinnamate photocrosslinkable copolymers. The thermal decomposition products include gases, liquids and solids. The gases are formed from saturated and unsaturated volatile hydrocarbons C1? C4, carbon monoxide and carbon dioxide. The liquid fraction includes aromatic hydrocarbons and some oxygenated organic compounds. The solid product identified in the greatest amount was cinnamic acid. The content in the thermal decomposition products varies considerably both with copolymer composition and temperature. 相似文献
195.
Development of nano indium tin oxide (ITO) grains by alkaline hydrolysis of In(III) and Sn(IV) salts
Indium tin oxide (ITO) nano powders of different compositions (In: Sn = 90: 10, 70: 30 and 50: 50) were prepared by heat treatment
(300-450°C) of mixed hydroxides of In(III) and Sn(IV). The hydroxides were obtained by the reaction of aq. NH3 with mixed aq. solutions of In(NO3)3 and SnCl4. FTIR and TG/DTA studies revealed that powders existed as In(OH)3H2O—SnO3H2H2O in the solid state and then they transformed to In2O3—SnO2 via some metastable intermediates after 300°C. Cubic phase of In2O3 was identified by XRD for the oxides up to 30% of Sn. Particle size measurements of the solid dispersed in acetone and SEM
study for microstructure showed that the oxides were in the nano range (55-75 nm) whereas the size range determined from Debye-Scherrer
equation were 11–24 nm. 相似文献
196.
用DSC研究了熔融温度对不同类型成核剂成核PP的异相成核作用的稳定性的影响。观察到随熔融温度提高,纯PP的成核作用稳定,降温结晶温度基本不变。而有机磷酸盐类成核剂成核PP的结果温度比纯PP的高,而且异相成核作用受熔融温度的影响也很小。但山梨醇类成核剂成核PP的异相成核作用随熔融温度提高,结晶温度逐步降低明显,表明其异相成核作用对热不稳定。 相似文献
197.
198.
Ran-Rong Lee 《Journal of the American Ceramic Society》1991,74(9):2242-2249
AIN ceramics with densities varying from 3.18 to 3.30 g/cm3 and room-temperature thermal conductivities varying from 88 to 193 W/m K were produced. Different sintering conditions, packing powders, AIN powder sources, carbon additive, and sintering times were evaluated, and the key processing parameters which cause the differences in density and thermal conductivity were identified. SEM, TEM, and EDS were used to characterize the correlation between thermal conductivity, microstructure, and processing parameters. The important parameters which control the thermal conductivity of AIN ceramics are discussed. 相似文献
199.
金属PTC陶瓷复合材料结构及其导电机理 总被引:2,自引:0,他引:2
研究了金属PTC陶瓷复合材料的电学性能和其材料组分。结果表明,掺入金属的PTC陶瓷材料经氮气中烧结,然后在空气中进行热处理,材料表面形成高势垒层,金属PTC陶瓷复合材料的室温电阻较PTC的陶瓷高。样品之中存在大量不同类型的极化,在低温时样品电阻较高,温度增加后,大量各种类型离子极化出现,在变价金属铁的变价导电作用下,削弱表面势垒,使金属PTC陶瓷复合材料电阻降低,表现出NTC现象。在电场作用下,正负电荷、晶粒畸变和空位缺陷等产生空间电荷极化使金属PTC陶瓷复合材料有较高介电常数。介电损耗(tgδ)频谱和介电δ温度谱上都出现一个介电峰,其主要原因是跃迁极化,金属阳离子由一个位置跃迁到另一个位置,在介电损耗所对应的频率和温度时出现跃迁极化率最大 相似文献
200.
针对陕甘宁盆地低渗透气田天然气井地层漏失等问题,通过室内试验,设计了密度为1.41~1.60g/cm3的二级固井高炉矿渣——MTC水泥浆和APIG级水泥——MTC水泥浆。目的提高固井质量、降低固井成本。结果通过对高炉矿渣的水化机理和两种MTC水泥浆对比分析,认为高炉矿渣——MTC转化法较APIG级水泥——MTC转化法,具有外加剂用量少、抗压强度高、体系简单、固井成本低等特点。结论两种低密度MTC水泥浆配方设计合理,性能优良,能满足现场施工的要求。 相似文献