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Dynamic mechanical properties of poly-ether-urethane elastomers with chain-extended or chain-folded molecularly uniform poly (N-alkylurethane) hard segment domains (1995)

Eisenbach, C. D. ; Stadler, E.

Springer

Colloid & polymer science 273 (1995), S. 352-358

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ISSN: 1435-1536

Keywords: Polyurethane elastomers ; segmented block copolymers ; poly(N-alkylurethane) ; hard segment ; chain folding ; dynamic mechanical properties

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Segmented polyetherurethanes with distinctively different morphologies, i.e., with chain-extended or chain-folded crystallized hard segments, could be created by small constitutional changes in the hard segment architecture. The different superstructure was achieved by building-in specially designed constitutional units in the middle of the otherwise regularly built hard segment which for flexibility or sterical reasons allowed an adjacent reentry chain-folded and/or chain-extended crystallization of the hard phase forming polyurethane segments. The material properties of the thermoplastic elastomers correlated systematically with the hard domain superstructure which was determined by the primary structure of the macromolecule and could be reversibly altered by the thermal history in the case of the flexible center unit. The softening temperature was determined by the hard domain height of the chain-folded lamellar or the chain-extended cylindrical domains; variation of the modulus in the elastomeric region could be related to imperfections in the hard segment packing which affected the effective hard domain filler.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00652349

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Paper (German National Licenses)

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Electronic Resource

Chain architecture and molecular self-organization of polyurethanes: Perspectives for thermoplastic elastomersPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Kautschukelastische Polymersysteme” in Bad Nauheim (Germany), March 30 - 31, 1992 (1992)

Eisenbach, C. D. ; Heinemann, T. ; Ribbe, A. ; [et al.]

Weinheim : Wiley-Blackwell

Angewandte Makromolekulare Chemie 202 (1992), S. 221-241

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ISSN: 0003-3146

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Segmented polyurethanes with a regular chain architecture exhibit very specific self-organizing properties, often leading to multiphase systems with special phase structures. The study of a series of relatively stiff, monodisperse polyurethane model compounds of various molecularly engineered structures and also multiblock copolymers consisting of an alternating sequence of highly flexible polyether and the above polyurethane segment has shown that extended chain crystallization and chain folding of hard segments and thus the size, shape and ordering of the hard domains can be created and rearranged at will. The molecular design, which can also be applied to graft copolymers, predetermines the possibilities of supramolecular organization. These thermoplastic elastomers exhibit very special properties which correlate sysmatically with the supramolecular structure.

Additional Material: 12 Ill.