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首页> 外文会议>55th IWCS/Focus~TM Conference >Organic Peroxide-Initiated Crosslinking Study of Cable Compounds
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Organic Peroxide-Initiated Crosslinking Study of Cable Compounds

机译：电缆化合物的有机过氧化物引发的交联研究

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One of the most widely used crosslinking methods for wire and cable compounds in electrical applications is radical reaction by organic peroxides to enhance both dimensional stability at elevated temperatures and physical integrity under high electrical stress of the compounds. A moving die rheometer (MDR) has been a useful instrument to investigate the various crosslinking stages and crosslinking kinetics of the peroxide based thermal vulcanization of compounds with organic peroxide. In this study, we obtained the dynamic properties of polyethylene compounds with dicumyl peroxide (one peroxy group) and a,a'-bis(tert-butylperoxy)-diisopropylbenzene (two peroxy groups) from 150 ℃ to 200℃. It was found that the thermal decomposition of the peroxide follows the first order free-radical decomposition reaction and therefore, half-lives at various temperatures can be estimated from the kinetic data. The compound containing dicumyl peroxide crosslinked faster than the compound with a,a'-bis(tert-butylperoxy)-diisopropylbenzene, but it would also generate scorch faster at the lower temperature range. The activation energy of the compounds with dicumyl peroxide was estimated slightly higher than that of α,α'-bis(tert-butylperoxy)-diisopropylbenzene. For another kinetic study approach, the time dependent torque from the MDR is assumed to be equivalent to the modulus of the compounds during the crosslinking process, and described by the concept of a non-equilibrium thermodynamic fluctuation theory of characteristic exponential decay behavior. It was found that the activation energy of relaxation for crosskinking of dicumyl peroxide is slightly lower than that of a,a'-bis(tert-butylperoxy)-diisopropylbenzene in polyethylene. The understanding of these concepts can help to achieve an improved balance of processability and cure performance for potential new compounds in wire and cable applications.
机译：用于电气应用中的电线和电缆化合物的最广泛使用的交联方法之一是有机过氧化物的自由基反应，以提高化合物在高温下的尺寸稳定性和在高电应力下的物理完整性。动模流变仪（MDR）已成为研究基于过氧化物的化合物与有机过氧化物热硫化的各种交联阶段和交联动力学的有用工具。在本研究中，我们获得了在150℃至200℃下具有过氧化二枯基（一个过氧基团）和a，a'-双（叔丁基过氧）-二异丙基苯（两个过氧基团）的聚乙烯化合物的动力学性能。已经发现过氧化物的热分解遵循一级自由基分解反应，因此，可以从动力学数据估计在各种温度下的半衰期。含过氧化二枯基的化合物的交联速度比与α，a'-双（叔丁基过氧）-二异丙基苯的化合物交联快，但在较低温度范围内，它也会更快地产生焦烧。估计该化合物在过氧化二枯基中的活化能略高于α，α'-双（叔丁基过氧）-二异丙基苯的活化能。对于另一种动力学研究方法，来自MDR的与时间有关的扭矩被假定为与交联过程中化合物的模量相等，并由具有特征性指数衰减行为的非平衡热力学波动理论的概念来描述。已经发现，过氧化二枯基交联时的弛豫活化能比聚乙烯中α，α′-双（叔丁基过氧）-二异丙基苯的弛豫活化能稍低。对这些概念的理解可以帮助实现电线电缆应用中潜在新化合物的可加工性和固化性能之间的平衡。

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