Differential Scanning Calorimetry of Polyurethanes

  • W. J. MacKnight
  • M. Yang
  • T. Kajiyama


The urethane linkage results from the reaction of an isocyanate group and a hydroxyl group and has the structure \( \left( {\begin{array}{*{20}{c}} H&O&{} \\ |&{||}&{} \\ { - N - }&{C - }&{O - } \end{array}} \right) \). Polymers containing this linkage are referred to as polyurethanes although the term has also been applied to polymers containing related linkages (such as the disubstituted urea linkage.) A large number of polyurethane polymers are known, ranging from thermoplastics to elastomers, and a few are commercially important. There are two principle synthetic routes to the polyurethanes,1 In the prepolymer method, a low molecular weight polyester or polyether containing hydroxyl end groups is reacted with an excess of diisocyanate. The resulting isocyanate terminated species is called the prepolymer and is usually of sufficiently low molecular weight to be liquid at room temperature. The prepolymer is cured to an elastomeric product by reacting it with a diamine or a diol. Small amounts of triols and higher polyols are often used to introduce crosslinking.


Differential Scan Calorimetry Repeat Unit Hexamethylene Diisocyanate Urethane Linkage Methylene Sequence 
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Copyright information

© Plenum Press 1968

Authors and Affiliations

  • W. J. MacKnight
    • 1
  • M. Yang
    • 1
  • T. Kajiyama
    • 1
  1. 1.Department of Chemistry and Polymer Science and Engineering ProgramUniversity of MassachusettsAmherstUSA

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