The Rheometrics Mechanical Spectrometer: Characterisation of HTPB Gumstocks by Viscometry and Eccentric Rotating Disc Rheometry.
EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (ENGLAND)
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A new and versatile rheometer, the Rheometrics Mechanical Spectrometer, is described and one application to characterise the rheological properties of HTPB hydroxy-terminated polybutadiene gumstocks is demonstrated. Viscosity changes during cure are measured by cone and plate and parallel plates but later stages of cure, when viscosity is approaching infinity, are monitored by the eccentric rotating disc mode. Dynamic moduli G,G, are calculated and the time to full cure at 60 C is determined for formulations containing up to 50 per cent added inert plasticiser isodecyl pelargonate. Author
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