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Effect of MMA on the physical properties of urethane–methacrylate

机译：Effect of MMA on the physical properties of urethane–methacrylate

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AbstractUrethane prepolymer was prepared by reacting two moles of tolylene diisocyanate with one mole of poly(ethylene glycol) (mol wt 400), followed by end‐capping with two moles of 2‐hydroxyethyl methacrylate at room temperature (30 ± 1°C) in the presence of stannous octoate as catalyst. Different proportions of methyl methacrylate (MMA) were added to the urethane prepolymer in order to study the effect of composition on mechanical properties. Sheets were fabricated by adding 1 azobis (isobutyronitrile) (w/w) to this solution. All the copolymer sheets had a transmittance similar to the PMMA sheet, in the wavelength range of 400–800 nm. Tensile strength and modulus decreased with decreasing MMA content, whereas percent elongation at break increased. All the samples showed 2–3 stages of degradation. Initial decomposition temperature increased with increasing carbamate content. © 1993 John Wiley

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