Fracture behavior of triglyceride-based adhesives
CD Lorenz and MJ Stevens and RP Wool, JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 42, 3333-3343 (2004).
The use of natural plant oils in the production of adhesives has been the focus of much research because natural oils are a renewable resource which have environmental and economic advantages over the petroleum- derived chemicals used in traditional adhesives. The network formation and the stress-strain behavior of these plant oil-based adhesives is studied using a combination of simulation techniques. An off-lattice Monte Carlo simulation has been developed to model the formation of these networks via the free-radical copolymerization of the triglycerides present in natural oils. Networks of systems representing the triglycerides found in soybean oil, linseed oil, and olive oil are generated, as are networks made from other "theoretical" natural oils. The structure of the networks is characterized by percolation analysis. The stress-strain behavior of these networks is studied using large- scale molecular dynamics simulations. Tensile strains are applied to the networks and it is observed that with increasing n the failure stress increases but the failure strain decreases. Also, for systems with low values of n, large voids form while the system is strained and then the system fails cohesively. However, for large n, no significant voiding is observed and the system fails close to the interface. The simulation results are shown to be consistent with the vector percolation theoretical prediction for how the failure stress relates to n. (C) 2004 Wiley Periodicals, Inc.
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