Chemorheology of photopolymerizable acrylates using a modified Boltzmann sigmoidal model |
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| Authors: | B. J. Love F. Piguet Ruinet F. Teyssandier |
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| Affiliation: | 1. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109;2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109;3. Department of Biological and Materials Sciences (Dentistry), University of Michigan, Ann Arbor, Michigan 48109;4. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 |
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| Abstract: | Experiments were conducted to evaluate the influence of ambient photoconversion on rheology for a range of photopolymerizable urethane dimethacrylate (UDMA) resins containing varying amounts of three comonomers including 1,6 hexane diol‐dimethacrylate (HDDMA), an alkoxylated cyclohexane dimethanol diacrylate monomer (CD‐582), and hydroxyethyl methacrylate (HEMA). Experiments were performed both as a function of composition and time‐dependent dose varying the intensity using a photorheometer. A semilog‐based sigmoidal model allowed the determination of four physical model parameters to define the relationship between reaction kinetics and its dynamic influence on viscosity. We have observed induction times and viscosity changes associated with the model that shows a trend in reaction kinetics in the following order from most to least reactive: UDMA > CD582 > HDDMA > HEMA. With increasing amounts of reactive diluent included in the formulation, the kinetics of reaction was more sluggish. The value of this sigmoidal model is that it could help define formulation and process conditions most likely to control crosslinking to maximize dimensional stability or other thermophysical properties. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2319–2325, 2008 |
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| Keywords: | acrylates conversion crosslinking modeling photopolymerization rheology sigmoidal |
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