Biodegradable polyurethane elastomers prepared from isocyanate‐terminated poly(ethylene adipate), castor oil,and glycerol |
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Authors: | Naozumi Teramoto Yuichi Saitoh Atsuo Takahashi Mitsuhiro Shibata |
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Affiliation: | Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, Tsudanuma, Narashino, Chiba 275‐0016, Japan |
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Abstract: | The curing reaction of tolylene‐2,4‐diisocyanate‐terminated poly(ethylene adipate) (PEA‐TDI) with a mixture of castor oil (CO) and glycerol (GO) with a NCO/OH ratio of 1.0 at 150°C gave crosslinked polyurethane (CO/GO‐PU). All the polyurethanes were elastomeric materials at room temperature. The glass‐transition temperature of the CO/GO‐PU increased with decreasing CO/GO ratio. All the cured polyurethanes had a higher 5% weight loss temperature than PEA‐TDI. The tensile strength and modulus of the polyurethanes increased with decreasing CO/GO ratio, and tensile residual strain after 300% elongation for all the CO/GO‐PUs was almost 0. All the polyurethanes had biodegradability, when measured by a biochemical oxygen demand method in an aqueous medium using activated sludge. The rate of the biodegradation of the polyurethanes increased with an increase of CO/GO ratio. The crosslinked CO‐PU showed much higher biodegradability than the linear PEA‐TDI. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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Keywords: | biodegradable cross‐linking polyesters polyurethanes castor oil |
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