Hydrogen bonding in thermoplastic polyurethane elastomers - Dynamic mechanical analysis

A relatively high degree of physical crosslink was inferred from the superi or mechanical properties of thermoplastic polyurethane elastomers(TPU). For the most part, this has been assumed due to hydrogen bonding. In this pape r hydrogen bonding effects in some thermoplastic polyurethane elastomers, c onsisting of poly(tetramethylene oxide) of (M) over bar (n)= 2 000, 4,4 ' - diphenyl methane diisocyanate and extenders: N-methyl diethanol amine,1,4-b utandiol and 1,2-ethylene diamine, have been studied by using dynamic mecha nical analysis. The activation energies of hydrogen bonding dissociation an d the physical crosslink densities have been evaluated from the elastic mod ulus-temperature relation of the TPU samples.