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First measurements Investigations into the Curing of Hysol 9396 using Differential Scanning Calorimetry. (Tim). Differential Scanning Calorimetry. Study how fully-cured Hysol9396 gets after different cure times and with different cure temperatures

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(Tim)

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  1. First measurements Investigations into the Curing of Hysol 9396 using Differential Scanning Calorimetry (Tim)

  2. Differential Scanning Calorimetry • Study how fully-cured Hysol9396 gets after different cure times and with different cure temperatures • Eg. How well cured is it after 1 day at 22C? • NB. Hysol received March 2010 ! • Measurements • Dynamic: Measure heat flow into/out of sample during a temperature ramp (eg 0 to 220C) • Measures the maximum possible heat associated with curing exotherm. • Static: Measure heat flow into /out of sample at a fixed temperature followed by dynamic scan. • Measures heat associated with curing at fixed temperature. • By combining both types of measurement the degree of cure for a given process can be determined.

  3. Dynamic scan from 0 to 220C

  4. Dynamic Scans melting!

  5. Isothermal Scans

  6. Summary • Typical heat released in a dynamic scan of un-cured Hysol is 560 ± 25 J/g (5%). This compares reasonably well with the data from the Wright Laboratory report. • “CHARACTERIZATION OF EA9396 EPOXY RESIN FOR COMPOSITE REPAIR APPLICATIONS” • For room-temperature cured Hysol (1-4 days), the un-released heat is typically 190J/g implying that only 66% of the available heat-release has occurred. (WL-TR-92-4060 quotes 170J/g released after 7 day cure at room temperature) • Room-temperature cured sample show indications of melting at about 60C • There is some degree of correlation between curing time and heat release/re-melt temperature.

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