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Thermoplastic elastomers by “criss‐cross”‐cycloaddition polymerization
Author(s) -
Maier Gerhard,
Fenchl Andrea
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971220147
Subject(s) - materials science , elastomer , thermoplastic elastomer , polymer chemistry , isocyanate , polymer , telechelic polymer , polymerization , cycloaddition , thermoplastic , polymer science , softening , composite material , copolymer , chemistry , end group , polyurethane , organic chemistry , catalysis
Segmented blockcopolymers were prepared via the condensation of telechelic precursors. “Criss‐cross”‐cycloaddition of an aromatic aldazine with a diisocyanate gave telechelics with isocyanate functions at both ends. These prepolymers were reacted with α, ω‐dihydroxytelechelic aliphatic polyethers. The cyclo‐addition‐polymers served as hard segments with softening temperatures between 100°C and 150°C. The resulting segmented blockcopolymers exhibited microphase separation. Depending on the length and fractions of hard and soft segments, the mechanical properties varied from tough thermoplastics to soft elastomers with ultimate elongations above 800%.