• 1967 Ph.D., Iowa State University
• 1965 M.S., Iowa State University
• 1962 B.S., Iowa State University

Dr. Timm's research focuses on composite materials comprised of a polymeric matrix. Emphasis is directed at developing correlations between the resin's molecular structure and its physical performance.

With thermosetting resins, polymeric molecules are characterized by their degree of polymerization, chemical composition, extent of chain branching, and degree of chain cross-linking.

Theoretical modeling incorporates deterministic and stochastic methodologies. In one phase of the research, kinetic reaction studies are directed at the evaluation of reaction mechanism and rate constants.

In a second phase, estimates of molecular structure are confirmed and incorporated into structure/property relationships. Tsai-Halpin correlations then couple matrix contributions with reinforcement properties and spatial orientation.

In a third phase nondestructive evaluations are performed using non-obtrusive, embedded sensors. Using a numerically controlled machine, composite specimens are filament wound.

• Robbins, D.; Timm, D.C., Kinetic Reaction Analysis of Gelation; First-Shell Substitution Effects in a Random A2-A2xB2 Step-Growth Resin. Submitted to Macromolecules, 1997.
• Robbins, D.; Zhu, Q.; Timm, D.C., Kinetic Reaction Analysis of Gelation: Investigations of Random Step-Growth and Chain-Initiated Resins. Ind. & Eng. Chem. Research, 1997, 36 #4, 1360-1372.
•  For additional publications, please click the Digital Commons link in the right column of the page.