NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Chemical and Thermal AnalysisDuring the past six months we have conducted significant research in several domains in order to clarify and understanding the aging and chemical failure mechanism of thermoplastics (PVDF or Tefzel) for pipes. We organized numerous analytical studies with methods including Fourier Transform Infrared Spectroscopy, Dynamic Mechanical Analysis, Differential Scanning Calorimetry, and Stress Relaxation experiments. In addition we have reanalyzed previous thermogravimetric data concerning the rate of deplasticization of Coflon pipe. We investigated a number of aged samples of both Tefzel and Coflon that were forwarded from MERL. We conducted stress relaxation experiments of Coflon pipe at several temperatures and determined an activation energy. We also examined the dynamic mechanical response PVDF during deplasticization and during methanol plasticization. We performed numerous DSC analyses to research the changing crystalline morphology. We have noted significant changes in crystallinity upon aging for both PVDF and Tefzel. Little variation in elemental composition was noted for many of the aged Coflon and Tefzel samples tested.
Document ID
19980201274
Acquisition Source
Kennedy Space Center
Document Type
Contractor Report (CR)
Authors
Bulluck, J. W. (Texas Research Inst., Inc. Austin, TX United States)
Rushing, R. A. (Texas Research Inst., Inc. Austin, TX United States)
Date Acquired
September 6, 2013
Publication Date
June 30, 1995
Subject Category
Nonmetallic Materials
Report/Patent Number
CAPP/T.3
NAS 1.26:207617
NASA/CR-95-207617
Funding Number(s)
CONTRACT_GRANT: NAG10-153
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available