Delmar C. Timm
Professor
Department of Chemical & Biomolecular Engineering
College of Engineering, University of Nebraska–Lincoln
207I OTHM Lincoln NE 68588-0643
dtimm1@unl.edu

Research Interests:

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.

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2004

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Chemical/Mechanical Analyses of Anhydride-Cured Thermosetting Epoxys: DGEBA/NMA/BDMA, Wei Chian and Delmar C. Timm

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Kinetic Reaction Analysis of an Anhydride-Cured Thermoplastic Ep-oxy:PGE/NMA/BDMA, Wei Chian and Delmar C. Timm

2003

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Deterministic Solutions for a Step-growth Polymerization, Sungjae Choi, Xiangdong Liu, and Delmar C. Timm

2001

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Michaelis–Menten Kinetics for Enzymatic Depolymerization of a Linear Polyester Synthesized from Z-Protected Glutamic Acid, R M. Tadros, Hossein Noureddini, and Delmar C. Timm

1999

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Biodegradation of Thermoplastic and hermosetting Polyesters from Z-Protected Glutamic Acid, R M. Tadros, Hossein Noureddini, and Delmar C. Timm

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Z-Protected Glutamic Acid-Based Biodegradable Thermoplastic and Thermosetting Polyesters: Synthesis and Characterization, R M. Tadros, Hossein Noureddini, and Delmar C. Timm

1994

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First Shell Substitution Effects: Diglyeidyl Ether of Bisphenol A cured with 4,4'-Diaminodiphenylmethane , Hossein Noureddini and Delmar C. Timm

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Reaction Kinetics Analyses of Amine-Cured Epoxies: First Shell Substitution Effects, Hossein Noureddini, C Q. Zhang, and Delmar C. Timm

1993

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Reaction Kinetics Analysis of Urethane Polymerization to Gelation, B Liu, Hossein Noureddini, J S. Dorsey, and Delmar C. Timm

1992

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Kinetic Analysis of Competing Intramolecular and Intermolecular Polymerization Reactions , Hossein Noureddini and Delmar C. Timm