ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
The object of this study was the exploration of the dynamic mechanical properties and thereby also of the phase behavior of partly sulfonated polystyrenes containing polyurethane grafts. The synthesis was accomplished by stepwise grafting onto the partly sulfonated polystyrene of N-methyldiethanoloamine, via ionic interactions resulting from proton transfer followed by chain growth on the hydroxyl sites of the polyurethane structures. NMR spectra confirmed that the protons of the sulfonic acid groups had been transferred exclusively to the tertiary nitrogen of the N-methyldiethanoloamine. If the grafts consist of only hard segments, then a single glass-transition temperature is observed that depends on the length of attached hard segment. If, on the other hand, soft segments are also included in the grafts, then these phase-separate and yield a new glass-transition temperature. For the phase-separated systems, the grafts yield a low Tg phase of higher purity than blending of sulfonated polystyrene with the preformed polyurethane of the same composition. © 1993 John Wiley & Sons, Inc.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1993.070480316
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