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Rheology of perfluoropolyether lubricants

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5 Author(s)
R. -N. Kono ; New Focus, Santa Clara, CA, USA ; S. Izumisawa ; M. S. Jhon ; C. A. Kim
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The rheological properties, including melt viscosity, storage modulus and loss modulus of perfluoropolyether (PFPE) lubricants with different molecular weights and chain-end functionalities, were measured using a rotational rheometer. The melt viscosities of fractionated PFPEs exhibited Newtonian behavior, and increased linearly with molecular weight. For PFPE containing functional, polar endgroups there is a sharp transition in the slope for the viscosity at a critical molecular weight. We also found that the intrinsic viscosity or Huggins coefficient can be used to examine media noise developed in the manufacturing stage

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IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )