Engineering topics
Publications and source records attributed to Winkler, E. L..
Performance of polybenzimidazole composites as ablation shields can be substantially improved by thermal crosslinking. Program was designed to develop new processing methods and techniques for fabrication of polybenzimidazole composites. Report, which describes fabrication in detail, also includes specification and manufacturing standards.
A methanator fueled Otto-cycle engine is compared with other methods proposed to control pollution due to automobile exhaust emissions. The comparison is made with respect to state of development, emission factors, capital cost, operational and maintenance costs, performance, operational limitations, and impact on the automotive industries. The methanator fueled Otto-cycle engine is projected to meet 1975 emission standards and operate at a lower relative total cost compared to the catalytic muffler system and to have low impact. Additional study is required for system development.
Three statistical methods of general validity are valuable for characterizing any polymer which results from chain polymerization of multifunctional branching monomers linked through bifunctional monomers.
Description of a statistical method for characterizing the structure of an average phenolic-novolak prepolymer molecule in terms of the total number of phenolic nuclei that compose the molecule and the number of these nuclei that are pendent. It is only necessary to resort to experimental pyrolysis to evaluate the thermokinetic parameters for pyrolysis for the ablator. In addition, the fraction of phenolic involved in the major pyrolysis reactions can be estimated in terms of the parameters previously evaluated. It is shown that the overlapping reactions which occur during pyrolysis of a phenolic-novolak can be resolved by pyrolyzing samples with different extents of cure. It is then possible to determine the kinetic parameters for pyrolysis for the major reactions by well-known methods which often fail when reactions are not well resolved.
Polymer structure and cross-link density effects on thermal analysis of phenol-formaldehyde polymers pyrolysis products
Cross link density and polymer structure effects on thermal analysis of phenol formaldehyde polymers
Effects of molecular structure on thermochemical properties of phenolic resins and related polymers
Molecular structure effects on thermochemical properties of phenolic resins and related polymers
Discontinuity effects in surface catalytic activity on laminar heat transfer in arc heated nitrogen streams
Enthalpy of gas stream, calorimeter surface treatment and heat transfer measurement errors in arc-heated tests
Measurements in a frozen, partially dissociated, high-speed gas stream
Comparison of results of a number of methods for measuring the stream energy content in a frozen, partially dissociated, high-speed gas stream of an arc-heated wind tunnel