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Studies on chemoviscosity modeling for thermosetting resins
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bai, J. M. Hou, T. H. Tiwari, S. N. |
| Copyright Year | 1987 |
| Description | A new analytical model for simulating chemoviscosity of thermosetting resins has been formulated. The model is developed by modifying the well-established Williams-Landel-Ferry (WLF) theory in polymer rheology for thermoplastic materials. By introducing a relationship between the glass transition temperature Tg(t) and the degree of cure alpha(t) of the resin system under cure, the WLF theory can be modified to account for the factor of reaction time. Temperature dependent functions of the modified WLF theory constants C sub 1 (t) and C sub 2 (t) were determined from the isothermal cure data. Theoretical predictions of the model for the resin under dynamic heating cure cycles were shown to compare favorably with the experimental data. This work represents progress toward establishing a chemoviscosity model which is capable of not only describing viscosity profiles accurately under various cure cycles, but also correlating viscosity data to the changes of physical properties associated with the structural transformation of the thermosetting resin systems during cure. |
| File Size | 2401421 |
| Page Count | 97 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870017604 |
| Archival Resource Key | ark:/13960/t6062fp2k |
| Language | English |
| Publisher Date | 1987-05-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Viscosity Thermoplastic Resins Polymer Chemistry Simulation Rheology Glass Curing Chemical Reactions Analysis Mathematics Models Thermosetting Resins Glass Transition Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
