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Synthesis and properties of molecularly uniform oligourethanes with chain‐folding units in the center
Author(s) -
Eisenbach Claus D.,
Stadler Edmund,
Enkelmann Volker
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.1995.021960313
Subject(s) - chain (unit) , crystallization , superstructure , folding (dsp implementation) , polymer chemistry , materials science , crystallography , chemistry , thermodynamics , organic chemistry , physics , structural engineering , astronomy , engineering
The study of a series of molecularly uniform poly( N ‐alkylurethanes) with a systematically varied and tailored chain architecture has shown that the packing and superstructure can be controlled by the primary structure of the urethane chain and reversibly altered by the sample treatment, respectively. Depending on the conformation or the stereogeometry of the constitutive unit built in the middle of the otherwise symmetrical oligourethane, chain‐extended and/or chain‐folded crystallization of the urethane chain can occur. The packing order, i. e., adjacent recentry chain‐folding or chain‐extended crystallization, and the thermal properties of the oligourethanes are related to the chemical structure of the central constitutive unit.