Polyurethane

Aug 16 2001

Advantages

Can be tailored chemically to yield products in a wide variety of forms.  Excellent abrasion resistance (elastomers) and tear resistance.  Resistant to ozone and aliphatic hydrocarbons.  May be injection moulded.  Excellent adhesion.

Disadvantages

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Poor U.V. resistance. Isocyanates are highly toxic.  High smoke evolution.  Poor solvent and acid resistance. Limited heat resistance.  High hysteresis - hence heat build-up during cyclic loading.

Applications

Soft microcellular foams for cushioning, packaging.  Semi-rigid foams for insulation, foam-in-place buoyancy.  Hard microcellular foams for shoe soles, car bumpers, tyres, wheels, gears, fuel hose.  Structural foam for housings, panels.  Cast elastomers for bearings, gears and wheels.

NOTE: Polyether based PU is superior to Polyester-based PU in terms of resistance to hydrolysis, hysteresis, heat build-up and low temperature impact, but polyether PUs are inferior to Polyester PUs for oil and abrasion resistance, ageing and general mechanical props. 

 

Source : Abstracted from Plascams

For more information on Plascams please visit The Rubber and Plastics Research Association

 

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Related Books

  • Assessing Food Safety of Polymer Packaging
  • Chemistry and Technology of Polyols for Polyurethanes
  • Physical Properties of Polymers Handbook

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