Polyurethane

related topics
{acid, form, water}
{@card@, make, design}
{car, race, vehicle}
{system, computer, user}
{company, market, business}
{build, building, house}
{ship, engine, design}
{style, bgcolor, rowspan}
{county, mile, population}
{mi², represent, 1st}
{album, band, music}

A polyurethane (IUPAC abbreviation PUR, but commonly abbreviated PU) is any polymer consisting of a chain of organic units joined by urethane (carbamate) links. Polyurethane polymers are formed through step-growth polymerization by reacting a monomer containing at least two isocyanate functional groups with another monomer containing at least two hydroxyl (alcohol) groups in the presence of a catalyst.

Polyurethanes are widely used in high resiliency flexible foam seating, rigid foam insulation panels, microcellular foam seals and gaskets, durable elastomeric wheels and tires, automotive suspension bushings, electrical potting compounds, high performance adhesives and sealants, Spandex fibers, seals, gaskets, carpet underlay, and hard plastic parts (such as for electronic instruments).

Polyurethane products are often called "urethanes". They should not be confused with the specific substance urethane, also known as ethyl carbamate. Polyurethanes are neither produced from ethyl carbamate, nor do they contain it.

Contents

History

Full article ▸

related documents
Welding
Portland cement
Carbon dioxide
Hydrogen
Oxygen
Sulfuric acid
Polymer
E number
Rutherfordium
Electron transport chain
Metabolism
Ozone
Fluorescent lamp
Ethanol
Nitrogen
Alkane
Ammonia
DNA
Protein
Xenon
Nuclear fission
Heavy water
Acid dissociation constant
Fusion power
Ozone depletion
Carbon
Alternative biochemistry
Uranium
Sulfur
Enzyme