| abstract |
A segmented copolymer can be produced without needing a chain extender. The conventional view that a chain extender was needed to construct a segmnented copolymer has been disproven. For example, by certain reactions of a diisocyanate with oligomeric and polymeric diols or diamines, segmented copolymers can be produced without needing a chain extender. Segmented copolymers not containing ethylene glycol, 1,4-butanediol and ethylene diamine can be produced. |