Rheology of perfluoropolyether lubricants

Author

Kono, Raymond-N ; Izumisawa, Satoru ; Jhon, Myung S. ; Kim, Chul A. ; Choi, Hyoung J.

Author_Institution

New Focus, Santa Clara, CA, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1827

Lastpage

1829

Abstract

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

Keywords

elastic moduli; lubrication; magnetic recording noise; molecular weight; polymer films; rheology; viscosity; Huggins coefficient; Newtonian viscosity; chain-end functionality; fly stiction; intrinsic viscosity; loss modulus; magnetic recording; manufacturing process; media noise; melt viscosity; molecular weight; perfluoropolyether lubricant; rheological properties; rotational rheometer; solvent quality; storage modulus; Drives; Fractionation; Loss measurement; Lubricants; Rheology; Rotation measurement; Solvents; Temperature; Viscosity; Working environment noise;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950980

Filename

950980