Abstract
AbstractPoly(ether)urethane elastomers (PEUE) having different sequence distributions can be synthesized by the reaction of p‐phenylene diisocyanate, poly(oxytetramethylene glycol), and hydrazine by four different routes. The degree of the sequence distribution of PEUE was determined by high‐resolution NMR spectroscopy. The sequence distribution of PEUE synthesized by the prepolymer method in solvent (method 1) was found to coincide with the sequence distribution calculated from the reactivity ratio of two isocyanate groups in p‐phenylene diisocyanate. On the other hand, the sequence distribution of PEUE obtained by the prepolymer method without solvent (method 2) was found to deviate from that expected from the reactivity ratio. The degree of the distribution of monomers in PEUE having the same composition ratio corresponded to the infrared absorbance ratio at 1720 and 1700 cm−1.
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