Abstract

The heat effects at flow of direct current in nanomodified elastomers of two types (polyurethane and silicone compounds) were investigated. The multiwalled carbon nanotubes (MWCNT) synthesized over the (Co–Mo)/(Al₂O₃–MgO) and (Fe–Co)/_2.1Al₂O₃ catalysts were used for nanomodification. The particle size analysis of MWCNT was carried out because the MWCNTs with various morphological parameters were synthesized over this type of catalysts. The composite manufactured on the basis of a silicone compound modified by 7 wt % of MWCNTs synthesized over the (Co–Mo)/(Al₂O₃–MgO) catalyst has the highest electrical conductivity (1.66 × 10^–1 S cm^–1), and the composite manufactured from the polyurethane compound modified by 1 wt % of MWCNT synthesized over the (Fe–Co)/_2.1Al₂O₃ catalyst has the lowest electrical conductivity (6 × 10^–10 S cm^–1). Variations in heat dissipations for various types of elastomers modified by MWCNT were detected by using the noncontact method of measuring of temperature field on the surface of samples. The manner of stabilized heat dissipation which is natural for the materials with a positive temperature coefficient of resistance was found. The highest intensity of heat dissipations combined with uniform distribution of the temperature field was observed for the samples manufactured on the basis of a silicone compound containing 7 wt % of the MWCNTs synthesized over the (Fe–Co)/_2.1Al₂O₃ catalyst. The maximum heating temperature for the sample operating under the voltage of 6 V of direct current was 102°C. Nonuniformity of heat dissipations is specific to almost all samples manufactured on the basis of the polyurethane compound. In this case, the samples based on the silicone compound demonstrate uniform heating at any level of filling by the MWCNTs. As a part of the study, a honey-combed sample was obtained, which, under the voltage of 6 V of direct current, was heated to 100°C and had a uniform distribution of the temperature field.

中文翻译：

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碳纳米管的添加对直流流动下弹性体的电导率和散热的影响

摘要

研究了两种类型（聚氨酯和有机硅化合物）的纳米改性弹性体在直流电流动下的热效应。在（Co-Mo）/（Al ₂ O ₃ -MgO）和（Fe-Co）/ _2.1 Al ₂ O ₃催化剂上合成的多壁碳纳米管（MWCNT）用于纳米改性。由于在这种催化剂上合成了具有各种形态学参数的MWCNT，因此进行了MWCNT的粒度分析。在（Co-Mo）/（Al ₂ O ₃ -MgO）催化剂上合成的以7 wt％的MWCNT改性的有机硅化合物制成的复合材料具有最高的电导率（1.66×10 ^–1 S cm^–1），并且由在（Fe–Co）/ _2.1 Al ₂ O ₃催化剂上合成的1％MWCNT改性的聚氨酯化合物制成的复合材料具有最低的电导率（6×10 ^–10 S cm ^–1）。使用非接触式测量样品表面温度场的方法，检测了MWCNT改性的各种类型弹性体的散热变化。发现了一种稳定的散热方式，这对于电阻温度系数为正的材料是自然的。对于以含7 wt％（Fe-Co）/ _2.1 Al ₂ O ₃合成的MWCNT的有机硅化合物为基础制造的样品，观察到了最高的散热强度和温度场的均匀分布。催化剂。在6 V直流电压下工作的样品的最高加热温度为102°C。散热不均匀特定于几乎所有基于聚氨酯化合物制造的样品。在这种情况下，基于硅氧烷化合物的样品在MWCNT的任何填充水平下均显示出均匀的加热。作为研究的一部分，获得了蜂窝状样品，该样品在直流电压6 V下加热至100°C，并具有均匀的温度场分布。