Conducting carbon black filled EDPM vulcanizates: assessment of dependence of physical and mechanical properties and conducting character on variation of filler loading
Conducting carbon black filled EDPM vulcanizates: assessment of dependence of physical and mechanical properties and conducting character on variation of filler loading
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DOI：
10.1016/s0014-3057(99)00157-3
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发表时间：
2000-05-01
影响因子：
6
通讯作者：
Chakrabarti, A
中科院分区：
文献类型：
--
作者：
Ghosh, P;Chakrabarti, A
研究了添加不同量的超导电性炭黑对三元乙丙橡胶（EPDM）硫化胶的部分物理力学性能、老化性能和直流导电性能的影响。炭黑填充量的增加导致密度、硬度和抗拉强度的单调增加，且炭黑填充量为bbb40 / phr时呈平稳趋势。然而，初始EPDM硫化胶的断裂伸长率在炭黑负荷为20phr时达到最大值；在135℃下老化7天，炭黑载荷最大位移到30 phr的位置。填充EPDM硫化胶的直流电导率测量表明，导电炭黑负载的渗透浓度范围超过15-30 phr。在不同温度下，炭黑填充EPDM硫化胶的电压(V)随电流(I)的增加而变化的趋势通常表明，当电流达到临界水平时，其欧姆行为。在临界电流（Ic）之外，开发的电压实际上对施加电流的大幅增强不敏感；因此，填充的硫化胶对i> I- c表现出非欧姆特性。人们试图分析和解释观察到的效果。电磁干扰（EMI）屏蔽效能（SE）一般随炭黑负载的增加而增加。硫化大大提高了填充EPDM化合物的EMI SE。(C) 2000 Elsevier Science Ltd.版权所有。
The effects of incorporation of different extents of extra conducting carbon black as filler on some selected physical and mechanical properties, aging behavior and DC electrical conducting character of vulcanizates of ethylene-propylene diene monomer (EPDM) based compounds have been studied. Increasing carbon black loading caused a monotonic increase in density and hardness and in tensile strength with a leveling off trend for carbon black filler loading >40 phr. Elongation at break of the initial EPDM vulcanizates, however, passes through a maximum corresponding to 20 phr carbon black loading; the position of the maximum shifts to 30 phr carbon black loading on aging of the vulcanizates at 135 degrees C for 7 days. DC electrical conductivity measurements of the filled EPDM vulcanizates indicate a percolation concentration range over 15-30 phr of conducting carbon black loading. Trends of change in voltage (V) developed with increase in the current (I) applied for the carbon black filled EPDM vulcanizates at different temperatures commonly indicate ohmic behavior for application of current up to a critical level. Beyond the critical current (Ic), the developed Voltage becomes practically insensitive to large enhancements in the applied current; the filled vulcanizates, thus, exhibit non-ohmic character for I>I-C. An attempt has been made to analyze and interpret the observed effects. Electromagnetic interference (EMI) shielding effectiveness (SE) generally increases on increasing the carbon black loading. Vulcanization substantially contributes to enhancement in the EMI SE of the filled EPDM compounds. (C) 2000 Elsevier Science Ltd. All rights reserved.