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Synthesis and properties of segmented poly(ether‐urethanes) with specially designed and symmetrically chain‐folding poly( N ‐alkylurethane) hard segments
Author(s) -
Eisenbach Claus D.,
Stadler Edmund
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960618
Subject(s) - chain (unit) , lamellar structure , materials science , polymer chemistry , folding (dsp implementation) , ether , elastomer , miscibility , crystallization , polymer science , thermoplastic elastomer , thermoplastic , methylene , composite material , polymer , chemistry , copolymer , organic chemistry , physics , astronomy , electrical engineering , engineering
The study of a series of segmented poly(ether‐urethanes) with highly flexible poly(oxytetra‐methylene) soft segments and especially designed, molecularly uniform poly( N ‐alkylurethane) hard segments based on piperazine and 1,4‐butanediol bischloroformate has shown that size, shape and perfection of the hard domains can be varied by both the primary structure of the urethane chain and the sample history. Depending on the conformation or the stereogeometry of the built‐in central constitutive hard segment unit, chain‐extended or chain‐folded hard segment crystallization, i. e., the formation of cylindrical or lamellar shaped hard domains can be achieved. These thermoplastic elastomers exhibit distinctly different properties which correlate systematically with the supermolecular structure and the corresponding hard segment architecture, respectively.