Evaluation of Tungsten Hexachloride as a ROMP Active Catalyst Precursor for Self -Healing Polymers
Kamphaus, Jason M.
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https://hdl.handle.net/2142/85104
Description
Title
Evaluation of Tungsten Hexachloride as a ROMP Active Catalyst Precursor for Self -Healing Polymers
Author(s)
Kamphaus, Jason M.
Issue Date
2007
Doctoral Committee Chair(s)
White, Scott R.
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
A drawback to current catalysts used in self-healing materials is the relatively low temperatures at which they deactivate. An advantage of WCl 6 is that the high melting temperature (Tm=275°C) allows for the use of the catalyst in higher temperature applications. Typical polymer and fiber reinforced plastic processing temperatures are 121 and 177°C. The ability of WCl6 catalyst to withstand these processing temperatures was probed. Several thermal analysis techniques were used to evaluate the activity of WCl6 after high temperature exposure. At both 121 and 177°C in an inert environment, the WCl6 retained sufficient activity for use as a ROMP precursor for self-healing applications. Mechanical evaluation through fracture experiments showed healing efficiencies as high as 92% if the processing and testing environment was carefully controlled.
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