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首页> 外文会议>Society of Tribologists Lubrication Engineers annual meeting exhibition >Rheological and tribological properties of viscosity index improver polymers in base oils
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Rheological and tribological properties of viscosity index improver polymers in base oils

机译：基础油中粘度指数改进剂聚合物的流变和摩擦学性能

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The air pollution requirements and the quest of minimum energy consumption push manufacturers to decrease all types of power loss in the internal combustion engine. Friction dissipating, 15%of the total energy, is one of the critical points.The viscosity and specially the variation of the viscosity with temperature is an important property of a motor oil where frictions can be reduced by adjusting its formulation. To ensure correct performance of the automotive engines, lubricants incorporate in their formulation Viscosity Index Improver (VII) additives. These polymers additives are used to ensure correct high temperature lubricating performance by causing a viscosity increase at high temperatures thus flattening the viscosity-temperature curve. At high shear rates the polymer molecules are deformed and align with the flow causing a shear thinning behavior thus a less contribution to the viscosity. For extreme shear rates the polymer chains can break and a permanent viscosity loss occurs. In this work, VII additives such as ethylene-propylene copolymers (HEPC) or hydrogenated polyisoprene-styrene (HPIS) are characterized. Their different properties such as their chemical structure, their molecular weight and their concentration are correlated with their rheological and tribologicals behaviors as well as their degradation behaviors.
机译：空气污染要求和对最低能耗的要求促使制造商减少内燃机中的所有类型的功率损耗。耗散总能量的15％是摩擦的关键点之一。粘度，尤其是粘度随温度的变化，是一种机油的重要特性，通过调整配方可以减少摩擦。为了确保汽车发动机的正确性能，润滑剂在其配方中加入了粘度指数改进剂（VII）添加剂。这些聚合物添加剂用于通过在高温下引起粘度增加从而使粘度-温度曲线变平而确保正确的高温润滑性能。在高剪切速率下，聚合物分子变形并与流对齐，从而导致剪切稀化行为，因此对粘度的贡献较小。对于极高的剪切速率，聚合物链可能会断裂，并发生永久性的粘度损失。在这项工作中，表征了VII添加剂，例如乙烯-丙烯共聚物（HEPC）或氢化聚异戊二烯-苯乙烯（HPIS）。它们的不同性质，例如化学结构，分子量和浓度，与它们的流变学，摩擦学行为以及降解行为相关。

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