Wednesday, July 10, 2013

polyurethane

A polyurethane (PUR and PU) is any polymer composed of a chain of organic units joined by carbamate (urethane) links. Polyurethane polymers are formed through step-growth polymerization, by reacting a monomer (with at least two isocyanate functional groups) with another monomer (with at least two hydroxyl or alcohol groups) in the presence of a catalyst.
at
Labels:

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)

talk nineteen to the dozen

  to speak rapidly and without stopping

  • abstemious
    Marked by, or spent in, abstinence ; as, an abstemious life.
  • Nureongi
    Nureongi (누렁이) and Hwangu (황구; 黃狗) are Korean terms meaning "Yellow Dog" used to refer to tannish mongrel or landrace of dog in...
  • acrolect - mesolect - basilect
    Three portions of the post-creole continuum : acrolect ( linguistics ) The variety of speech that is considered the standard form. m...