COLL 527 |
| Bernd Gotsmann1, Urs Duerig1, Jane E. Frommer2, Xian-Zhi Shou2, Brooke A. Van Horn2, and Craig Hawker2. (1) Zurich Research Laboratory, IBM Research, Saeumerstrasse, Rueschlikon, 8810, Switzerland, (2) IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120 |
| We report on the design of polymeric thin films that thermally and reversibly crosslink via Diels-Alder mechanisms. Thermomechanical properties on the nanometer scale are analyzed during indentation experiments with heated AFM tips. Experiments varying tip temperature and indentation time reveal Arrhenius deformation kinetics. This is in contrast to the WLF model usually applied for thermal deformation of polymers. The discrepancy is discussed in terms of the reversibility of the Diels-Alder mechanism. An application of these reversibly crosslinked films is presented for thermomechanical probe data storage. Below a certain temperature the thin film polymer storage medium is in the crosslinked state and highly wear resistant. At the higher temperatures of a heated probe tip during the indentation writing process, the polymer uncrosslinks, becomes compliant and easily plastically deforms. This lowers the barrier to forming indentations in the polymeric medium and implies potential improvements for fast writing times.
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Symposium in Memory of Arthur W. Adamson
2:00 PM-4:40 PM, Thursday, April 1, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |