Viscoelasticity and solution viscosity of perfluoropolyether lubricants
Viscoelasticity and solution viscosity of perfluoropolyether lubricants
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全氟聚醚润滑剂的粘弹性和溶液粘度
DOI：
10.1016/j.triboint.2005.01.024
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Jhon
中科院分区：
文献类型：
--
作者：
H. Choi;S. Lim;S. Izumisawa;M. Jhon
粘弹性特性包括粘度、储存模量和损失模量的全氟聚醚（PFPE）润滑油与反应端基通过旋转流变仪检查。通过聚合物动力学中的劳斯理论，对温度和分子量对流变性能的影响进行了广泛的分析。存储模量与损耗模量的改进Cole-Cole图显示，由于PFPE端基之间的相互作用，存在微结构。为了研究浸涂过程中的溶剂效应，我们研究了稀释PFPE溶液的特性粘度或哈金斯系数，它取决于PFPE簇的长径比和PFPE分子间的势能。我们还将粘弹性数据与摩擦学数据进行了关联。
Viscoelastic characteristics including the viscosity, storage modulus, and loss modulus of perfluoropolyether (PFPE) lubricants with reactive endgroups are examined via a rotational rheometer. Both temperature and molecular weight effects on rheological properties are extensively analyzed via the Rouse theory in polymer dynamics. The modified Cole–Cole plots for storage modulus vs. loss modulus exhibits the presence of microstructures due to the interaction among PFPE endgroups. To examine the solvent effect during the dip-coating process, we examined the intrinsic viscosity, or Huggins coefficient for dilute PFPE solutions, which depends on the aspect ratio of PFPE cluster and potential energy among PFPE molecules. We also correlated the viscoelastic data with the tribological data.