Accession Number : ADA261712


Title :   In-Process Cure Monitoring of Composites via Fiber-Optic Fluorescence


Descriptive Note : Final rept. Apr 1989-Jul 1992


Corporate Author : CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE


Personal Author(s) : Sung, C S ; Sung, N H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261712.pdf


Report Date : 23 Oct 1992


Pagination or Media Count : 3


Abstract : The objective of the research under this contract were to develop in-situ cure monitoring technique based on intrinsic and extrinsic chemical sensors using fiber-optic fluorescence method for epoxy and polyimide and to use such a fiber-optic method to investigate fiber surface effects on epoxy structure and cure kinetics. As an extrinsic cure sensor, p,p'-diamino azobenzene (DAA) shows sensitive fluorescence intensity enhancement as a result of reaction with epoxide. It has been implemented for in-situ cure monitoring of bulk epoxy cured with diaminodiphenyl sulfone (DDS) at high cure temperatures (140-180 deg C) using fiber optic fluorescence instrument, using an internal standard dye to calibrate the intensity. The intrinsic fluorescence excitation spectra of DDS was found to show sensitive spectral shifts with cure. This result has also been implemented with real composites (carbon or glass fiber reinforced prepregs) in actual cure environment by fiber optic fluorescence instrument, by taking into account the effect of temperature on the spectral position.... Cure monitoring, Diamine cured epoxy, Composites, Fiber-optic fluorescence, Polyimides, Extrinsic and intrinsic cure sensor, In-Process monitoring.


Descriptors :   *FIBER OPTICS , *FLUORESCENCE , *MONITORING , *CURING , TEMPERATURE , ENVIRONMENTS , COMPOSITE MATERIALS , EXCITATION , STRUCTURES , AUGMENTATION , INTENSITY , SURFACES , AMINES , SPECTRA , INTERNAL , GLASS FIBERS , STANDARDS , DYES , AZOBENZENES , EPOXY COMPOSITES , PREPREGS , PHENYL RADICALS , CHEMICAL DETECTION , SULFONES


Subject Categories : Polymer Chemistry
      Refractory Fibers
      Laminates and Composite Materials
      Fiber Optics and Integrated Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE