Polyurethane Resins
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Definition:
A family of resins produced by reacting a diisocyanate with an organic compound containing two or more active hydrogen atoms to form polymers having free isocyanate groups. These groups, under the influence of heat or certain catalysts, will in turn react with each other, or with a compound containing an active hydrogen, such as water or a glycol, to form a thermosetting material. Thermoplastic polyurethanes are also available as elastomeric or rigid materials readily accepting a variety of reinforcements such as glass or carbon fiber. A 40% glass fiber loading of the rigid material will yield a product with a flexural modulus of 1 million psi. With 30% carbon fiber a modulus of over 2 million psi is available. The terms urethane and polyurethane are used interchangeably.
Definition Copyright ©1989 CRC Press LLC. All rights
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