Premium
Synthesis and properties of molecularly uniform model compounds for the hard segments of 1,5‐naphthylene diisocyanate based polyurethane elastomers
Author(s) -
Festel Gunter,
Eisenbach Claus D.
Publication year - 1998
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/(sici)1521-3935(19980701)199:7<1365::aid-macp1365>3.0.co;2-#
Subject(s) - polyurethane , elastomer , polymer chemistry , materials science , polymer science , composite material
Two homologous series of molecularly uniform oligourethanes based on 1,5‐naphthylene diisocyanate (NDI) and 1,4‐butanediol (BDO) were synthesized and used as model compounds for the investigation of the structure/properties relations regarding the hard segment domains of NDI‐based polyurethane (PUR) elastomers. The NDI/BDO oligourethanes show extremely high crystalline melting points and unusually high heats of fusion. This is attributed to strong intermolecular interactions combined with the rigid structure of the naphthalene‐butanediol units. Decomposition occurred before the melting was completed. Annealing led to an improved crystal structure and higher softening points as long as decomposition in the amorphous regions was prevented by the choice of sufficiently low annealing temperatures.