ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Treffer pro Seite

Treffer 1 - 2 | 2 Treffer

Sortierung

Digitale Medien

Phase volume and size effects on the terminal relaxation of ABS melts (1994)

Castellani, L. ; Lomellini, P.

Springer

Rheologica acta 33 (1994), S. 446-453

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1435-1528

Schlagwort(e): ABS ; terminal relaxation ; gel point ; particle size ; interparticle distance

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Abstract The dynamical viscoelasticity of ABS melts with different particle size was investigated at various levels of rubbery phase contents. The effects of the rubber are more pronounced in the terminal zone: a transition from viscoelastic liquid to viscoelastic solid behavior was observed which can be interpreted as a physical gelation occurring at a critical rubbery phase content. This critical content resulted in being smaller in the case of smaller particles. A quantitative explanation of the experimental findings was proposed in terms of the average interparticle distance and overlapping of the chains grafted onto the neighboring rubber particles. The gel-like transition appeared to correspond to an approximately constant level of grafted chains overlapping.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00366587

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

Regiodefined substituted poly(2,5-thienylene)s (1993)

Gallazzi, M. C. ; Castellani, L. ; Marin, R. A. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 3339-3349

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 0887-624X

Schlagwort(e): Polythiophene ; terthiophene ; alkylthiophene ; alkoxythiophene ; regiospecificity ; oligomers ; conducting polymers ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The polymerization of 3,3″-dialkylterthiophenes overcomes the lack of regiospecificity associated (to some extent) with all the polymerization methods in use, thus allowing the preparation of perfectly regioregular polymers endowed with enhanced electrical and optical properties. Moreover, the larger spacing of the alkyl chains achieved with the insertion of an unsubstituted thiophene unit confers to such regioregular polymers an extraordinary doping stability. Two regiochemically defined alkoxy-substituted terthiophenes were also polymerized and the effects of the effects of the presence and position of the alkoxy group on the polymerization reaction and on the polymer properties are discussed. © 1993 John Wiley & Sons, Inc.

Zusätzliches Material: 5 Ill.