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A 69 cent look at thermoplastic softeningThe objectives are to demonstrate the change in mechanical properties of a thermoplastic polymer when the polymer is heated above the glass transition temperature. The instructor or student can perform this demonstration. In preparation for the demonstration, fill the flask or beaker 3/4 full with water and bring the water to a boil. First observe the initial stiffness of the toothbrush by slightly flexing it. Note that it is fairly stiff and retains its initial shape when the forces are removed. If you were to apply enough force, the toothbrush would break in a somewhat brittle fashion. Now place the toothbrush in the boiling water for 2 minutes. After the 2 minutes are up, remove the toothbrush from the boiling water with the washcloth. At this time, you will be able to bend the toothbrush easily. When it cools it will retain this bent shape. You've just demonstrated heating the polymer above the glass transition temperature, demonstrating thermoplastic softening. Instructor notes are provided.
Document ID
19930021774
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vanasupa, Linda S.
(California Polytechnic State Univ. San Luis Obispo, CA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1993
Publication Information
Publication: NASA. Langley Research Center, National Educators' Workshop. Update 92: Standard Experiments in Engineering Materials Science and Technology
Subject Category
Nonmetallic Materials
Accession Number
93N30963
Funding Number(s)
CONTRACT_GRANT: NSF USE-91-52078
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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