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The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide

The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide

          
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About the Book

The effect of molecular weight on the viscoelastic performance of an advanced polymer (LaRC-SI) was investigated through the use of creep compliance tests. Testing consisted of short-term isothermal creep and recovery with the creep segments performed under constant load. The tests were conducted at three temperatures below the glass transition temperature of five materials of different molecular weight. Through the use of time-aging-time superposition procedures, the material constants, material master curves and aging-related parameters were evaluated at each temperature for a given molecular weight. The time-temperature superposition technique helped to describe the effect of temperature on the timescale of the viscoelastic response of each molecular weight. It was shown that the low molecular weight materials have higher creep compliance and creep rate, and are more sensitive to temperature than the high molecular weight materials. Furthermore, a critical molecular weight transition was observed to occur at a weight-average molecular weight of M (bar) (sub w) 25000 g/mol below which, the temperature sensitivity of the time-temperature superposition shift factor increases rapidly. The short-term creep compliance data were used in association with Struik's effective time theory to predict the long-term creep compliance behavior for the different molecular weights. At long timescales, physical aging serves to significantly decrease the creep compliance and creep rate of all the materials tested.Nicholson, Lee M. and Whitley, Karen S. and Gates, Thomas S.Langley Research CenterAGING (MATERIALS); GLASS; MOLECULAR WEIGHT; TEMPERATURE EFFECTS; THERMOPLASTICITY; VISCOELASTICITY; POLYIMIDES; CREEP TESTS; ERROR ANALYSIS; TIME TEMPERATURE PARAMETER; GLASS TRANSITION TEMPERATURE; DURABILITY...


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Product Details
  • ISBN-13: 9781723766961
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1723766968
  • Publisher Date: 17 Sep 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide
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