Modeling the reaction kinetics and chemoviscosity of an epoxy resin system exhibiting complex curing behavior /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | Reaction kinetics and chemoviscosity models were developed for a standard aerospace epoxy resin system, Hercules 3501-6 resin, so that the viscosity variation of the resin during cure may be predicted. Prerequisite for the successful chemoviscosity modeling is an accurate kinetic model; but this resin system has been typically treated as a kinetically simple system although it exhibits complex curing reaction. The complex curing reaction of this resin system was resolved by non-isothermal kinetic analysis after isothermal aging at different temperatures. The overall reaction rate of the resin system can be modeled as a weighted sum of the reaction rates of three independent n-th order reactions. After a realistic kinetic model was obtained, a chemoviscosity model was then developed. The modified William-Landel-Ferry (WLF) equation, which allows one to incorporate the effect of the cure state of the resin system on viscosity through the change in glass transition temperature of the curing resin, can be used to describe the chemoviscosity as a function of temperature. The modified W LF equation expresses the dependence of viscosity variation on temperature, but its parameters, i.e., the glass transition temperature and reference viscosity, depend on the state of the resin system. A relationship between the glass transition temperature and the extent of cure of the resin was also used. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Mechanical Engineering. |
| Physical Description: | xi, 201 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |