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Analysis of Cure Behavior

IP.com Disclosure Number: IPCOM000042493D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Imken, RL: AUTHOR

Abstract

This article describes the use of a dynamic mechanical analysis technique as a monitor for curing behavior in polymeric materials which utilize radiation to initiate curing reactions. This technique is applicable to radiation such as electron beams, ultraviolet light or visible light. In the figure, the sample apparatus includes an oscillator 2 for providing motion of a particular characteristic, such as sinusoidal, to a plaque 3 of radiation-penetrable material. A second plaque 4 is provided and with plaque 3 sandwiches the curable material 6. This composite structure is located in the path of radiation from source 8. Force transducer 10 is connected to bottom plaque 4. In this configuration only one plaque needs to be radiation-penetrable.

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Analysis of Cure Behavior

This article describes the use of a dynamic mechanical analysis technique as a monitor for curing behavior in polymeric materials which utilize radiation to initiate curing reactions. This technique is applicable to radiation such as electron beams, ultraviolet light or visible light. In the figure, the sample apparatus includes an oscillator 2 for providing motion of a particular characteristic, such as sinusoidal, to a plaque 3 of radiation-penetrable material. A second plaque 4 is provided and with plaque 3 sandwiches the curable material 6. This composite structure is located in the path of radiation from source 8. Force transducer 10 is connected to bottom plaque 4. In this configuration only one plaque needs to be radiation-penetrable. Force transducer 10 monitors the viscoelastic properties of uncured radiation-curable material 6 in a sheer mode. As radiation is applied from source 8 to the test specimen composite, curing is initiated in material 6, changing its viscoelastic properties. Force transmitted from oscillator 2 to force transducer 10 increases as the cure process progresses. When complete cure has occurred, force sensed by transducer 10 stabilizes unless mechanical or radiation degradation has occurred. Peak signal monitor 12, which may be an oscilloscope, provides a signal to a graphical recording or a video display 14. Another approach to this problem utilizes radial oscillatory motion and provides similar data. This...