Accession Number : ADA302131

Title :   Chemoviscosity Modeling for Thermosetting Resins - 2.

Descriptive Note : Final rept.,

Corporate Author : PRC KENTRON HAMPTON VA

Personal Author(s) : Hou, T. H.

PDF Url : ADA302131

Report Date : AUG 1985

Pagination or Media Count : 37

Abstract : A new analytical model for simulating chemoviscosity of thermosetting resin has been formulated. The model is developed by modifying the well-established Williams-Landel-Ferry (WLF) theory in polymer rheology for thermoplastic materials. By assuming a linear relationship between the glass transition temperature Tg(t) and the degree of cure a(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 C1(T) and C2(T) were determined from the isothermal cure data of Lee, Loos, and Springer for the Hercules 3501-6 resin system. Theoretical predictions of the model for the resin under dynamic heating cure cycles were shown to compare favorably with the experimental data reported by Carpenter. 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 transformations of the thermosetting resin systems during cure. jg p.5

Descriptors :   *MATHEMATICAL MODELS, *CHEMICAL REACTIONS, *VISCOSITY, *THERMOSETTING PLASTICS, FUNCTIONS, TEMPERATURE, EXPERIMENTAL DATA, PREDICTIONS, PHYSICAL PROPERTIES, STRUCTURAL PROPERTIES, POLYMERS, REACTION TIME, PROFILES, LINEARITY, THERMOPLASTIC RESINS, RHEOLOGY, TRANSFORMATIONS.

Subject Categories : Plastics
      Polymer Chemistry
      Fluid Mechanics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE