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硅橡胶耐热老化性能的研究一铁铜氧化复合物的作用 总被引:4,自引:0,他引:4
研究了以铁铜氧化复合物为耐热添加剂的过氧化物高温硫化硅橡胶的热空气老化性能及其热稳定机理。通过热空气老化实验及热重法-差热分析表明:铁铜氧化复合物可以明显提高硅橡胶的热稳定性。 相似文献
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硅橡胶耐热老化性能的研究—铁铜氧化复合物的作用 总被引:3,自引:0,他引:3
研究了以铁铜氧化复合物为耐热添加剂的过氧化物高温硫化硅橡胶的热空气老化性能及其热稳定机理。通过热空气老化实验及热重法—差热分析表明 :铁铜氧化复合物可以明显提高硅橡胶的热稳定性 相似文献
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填充聚硅氮烷提高室温硫化型硅橡胶的性能 总被引:2,自引:0,他引:2
以填充聚硅氮烷的室温硫化型硅橡胶(RTV),在室温下硫化制得的硫化胶,与常规填充SiO2的RTV硫化胶进行了比较,试验结果表明,前者的物理机械性能优于后者;热老化性能(热空气250℃下,经48h),前者保持柔软,拉伸强度保持原来的70%以上,而后者则完全老化,丧失性能。 相似文献
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以疏水处理气相SO2填充补强Mn=4000~45000范围内的羟基封端聚二甲基硅氧烷制备双组份室温硫化硅橡胶(RIV-2)与混用高低分子量生胶或接枝硅橡胶做基胶相比,前者可以适度交联形成强韧的弹性体。 相似文献
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热硫化硅橡胶并用硫化体系的研究 总被引:1,自引:0,他引:1
在硅橡胶制品的研制中,采用了加成硫化和过氧化物化并用的新的硫化方式。比较了并用硫化方式在热空气和模压硫化的性能及特点。并用硫化体系可以改善硅橡胶硫化胶的某些性能,保持在二段硫化后不变色或少变色。介绍了显影用硅橡胶管生产的应用实例,在热硫化硅橡胶制品的研制和生产中具有一定的实用意义。 相似文献
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加速量热仪在锂离子电池热安全性研究领域的应用 总被引:2,自引:0,他引:2
加速量热仪(Accelerating RateCalorimeter,简称ARC)是用于危险品评估的新型热分析仪器,可以提供绝热条件下化学反应的时间、温度、温升速率和压力数据。本文着重介绍了加速量热仪应用在锂离子二次电池热安全性研究方面的研究成果,总结了锂离子二次电池的正负极材料、电解液和粘结剂等对锂离子二次电池热安全性的影响,并对ARC在离子电池热安全性研究发展方向的应用进行了展望。 相似文献
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综述了导热胶粘剂的导热机理、导热模型以及提高胶粘剂导热性能的途径;详细介绍了非绝缘导热胶粘剂和绝缘导热胶粘剂的技术研究与应用,最后对导热胶粘剂的发展前景作了展望。 相似文献
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为了适应测量热老化橡胶的导热率,改进了传统的稳态法测定导热率的测量方法.用该方法测量了热老化橡胶的导热率,并对热老化橡胶的导热率的变化机理进行了初步探讨. 相似文献
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J. Chojnowski J. Kurjata S. Rubinsztajn M. Scibiorek M. Zeldin 《Journal of Inorganic and Organometallic Polymers》1992,2(4):387-404
Thermal decomposition of poly[oxybis(dimethylsilylene)] having chains terminated with trimethylsiloxy groups was studied by thermogravimetry, pyrolysis-mass spectrometry, and infrared spectroscopy. The polymer is thermally less stable than poly(dimethylsiloxane). Depolymerization occurs at temperatures of 250–350°C, although this process also takes place at lower temperatures. The depolymerization produces cyclic oligomers of general formula [(Me2Si)2O]
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, with predominant formation of the oligomern=2. The depolymerization is accompanied by processes which are referred to as restructurization because they change the structure of the polymer backbone. Decomposition may lead also to the formation of branching points. The shape of the thermograms taken under isothermal conditions is in agreement with an unzipping mechanism for depolymerization involving random initiation. Excluding the short initial period of the process, the unzipping is terminated at a restructurization point. A low activation energy points to initiation induced by electron transfer, presumably involving traces of contaminant. At higher temperatures, 350–600°C, loss of organic parts of the polymer takes place along with further restructurization. At higher temperatures the polymer was also found to undergo easily oxygenation of its backbone with atmospheric oxygen, which leads to the formation of siloxane groups. 相似文献
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基于聚苯乙烯泡沫塑料保温材料的应用和研究,综述了保温材料的研究现状,从影响保温材料保温性能的三大因素——耐火性能、导热率、吸水率进行具体分析;然后基于聚苯乙烯泡沫塑料保温材料的研究现状,概述了聚苯乙烯泡沫塑料的优势,并分析了其耐火性能和保温性能,发现聚苯乙烯泡沫塑料在保温方面效果显著;聚苯乙烯泡沫塑料保温材料可以应用于外墙外保温构造、内墙内保温构造、屋面工程保温构造。 相似文献
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Murilo D. M. Innocentini Caue Ribeiro Luis R. M. Bittencourt Victor C. Pandolfelli 《Journal of the American Ceramic Society》2001,84(11):2696-2698
This article reports on an experimental investigation of the dewatering process of cement-free high-alumina refractory castables. Simultaneous fluid dynamic, thermal, and mass loss effects were investigated during the removal of physically absorbed water at temperatures of 25° to 700°C. The release of steam was decisively affected by the castable's permeability level and the heating rate applied. The analysis of fluid dynamics revealed that at 1°C/min, the main bulk of physical water was released as steam under saturated conditions at 100°C. However, at 5°C/min, steam was trapped within the pores, and water loss was chaotically released and shifted to higher temperatures. Thermal analysis showed that the endothermic boiling of water may result in a critical thermal shock in the castable's structure. Both steam entrapment and thermal shock were more severe with the reduction in the castable's permeability level. 相似文献