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POLYURETHANE

POLYURETHANE. Materials Science [MEEN-3344] Romeo R. Barrera. What is Polyurethane?. A type of elastomer which is capable of experiencing large and reversible elastic deformations. It’s amorphous, having molecular chains that are naturally coiled and kinked in its unstressed state.

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POLYURETHANE

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  1. POLYURETHANE Materials Science [MEEN-3344] Romeo R. Barrera

  2. What is Polyurethane? • A type of elastomer which is capable of experiencing large and reversible elastic deformations. • It’s amorphous, having molecular chains that are naturally coiled and kinked in its unstressed state.

  3. Who Invented it? • The underlying chemistry behind polyurethane was first developed by Professor Dr. Otto Bayer (1902-1982). • He invented the Diisocyanate Polyaddition Process which is the base patent in the polyurethane industry.

  4. What is the Diisocyanate Polyaddition Process ? • Polyurethanes are formed by reacting a polyol (an alcohol with more than two reactive hydroxyl groups per molecule) with a diisocyanate or a polymeric isocyanate in the presence of suitable catalysts and additives. • Since a multitude of different diisocyanates and polyols can be used to produce polyurethane, a broad range of polyurethanes can be manufactured to meet the requirements for specific applications.

  5. The Forms of Polyurethane FLEXIBLE – Solid & Foams REBOND - Foams RIGID – Resins (Table-top covers, furniture protection, etc)

  6. Where is Polyurethane Used? Polyurethane-based binders are used in composite wood products to permanently glue organic materials into oriented strand board, medium-density fiberboard, long strand lumber, laminated veneer lumber, strawboard and particleboard. Polyurethane-based sealants are used in joints and openings to help prevent the passage of gases, liquids, and solids (dust and dirt). Similarly, polyurethane-based adhesives are used to bond wall and ceiling panels to the structural frame, and floor joists to the sub-floor decking. Bonded polyurethane carpet cushion which is made with re-used flexible polyurethane foam (FPF). With the ability to be recycled and its high recycle content, bonded carpet cushion creates a valuable use for a material that would otherwise require disposal.

  7. References • http://www.polyurethane.org • http://www.pfa.org • http://www.rhinolinings.com/RL/main/ • Callister, William D. Jr. Fundamentals of Materials Science and Engineering. 2nd Ed.

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