Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
dem verdienten Forscher und Lehrer auf dem Gebiet der Makromolekule, rnit besten Wiinschen zum 70. Geburtstag gewidmet (Eingangsdatum: 3. Oktober 1975) ZUSAMMENFASSUNG :Die Wechselwirkung bestimmter Azofarbstoffe rnit Amylose in wal3riger Losung fuhrt zu starken hderungen der optischen Drehung (induzierte Cotton-Effekte) und zu einem Anstieg der spezifischen Viskositat. Amylose verhalt sich in Gegenwart von z. B. Kongorot (1) oder Diaminechtrot (2) wie ein Polyelektrolyt. Diese Erscheinungen werden rnit der Bildung raumlich geordneter Assoziate zwischen Amylose und Farbstoff-Molekulen erklart. Andere Farbstoffe (z. B. Azoblau (3) und Calcon (4)) haben weder EinfluD auf die Viskositat noch auf die chiroptischen Eigenschaften. Offensichtlich fehlen in diesen Fallen die erforderlichen strukturellenVoraussetzungen fur die Bildung von Assoziaten. Farbstoffe, die bei Amylose Cotton-Effekte induzieren und die Viskositat verandern, bilden mit Polyvinylalkohol thermoreversible Gele. SUMMARY:The interaction of certain azo dyes with amylose in aqueous solution is the cause of strong changes of optical rotation (induced Cotton-effects) and of an increase of specific viscosity. Amylose in the presence of Congo Red (1) or Benzo Fast Red F (2) behaves like a polyelectrolyte. These findings are explained in terms of sterically ordered association between amylose and dye-stuffs. Some other dyes (i.e. Azoblue (3) or Calcon (4)) have no influence neither on the viscosity nor on the chiroptical properties. Obviously in these cases the structural requirements for association are not fulfilled. Those dyes which induce Cotton effects and change the viscosity of amylose, form thermoreversible gels with poly(viny1 alcohol).
dem verdienten Forscher und Lehrer auf dem Gebiet der Makromolekule, rnit besten Wiinschen zum 70. Geburtstag gewidmet (Eingangsdatum: 3. Oktober 1975) ZUSAMMENFASSUNG :Die Wechselwirkung bestimmter Azofarbstoffe rnit Amylose in wal3riger Losung fuhrt zu starken hderungen der optischen Drehung (induzierte Cotton-Effekte) und zu einem Anstieg der spezifischen Viskositat. Amylose verhalt sich in Gegenwart von z. B. Kongorot (1) oder Diaminechtrot (2) wie ein Polyelektrolyt. Diese Erscheinungen werden rnit der Bildung raumlich geordneter Assoziate zwischen Amylose und Farbstoff-Molekulen erklart. Andere Farbstoffe (z. B. Azoblau (3) und Calcon (4)) haben weder EinfluD auf die Viskositat noch auf die chiroptischen Eigenschaften. Offensichtlich fehlen in diesen Fallen die erforderlichen strukturellenVoraussetzungen fur die Bildung von Assoziaten. Farbstoffe, die bei Amylose Cotton-Effekte induzieren und die Viskositat verandern, bilden mit Polyvinylalkohol thermoreversible Gele. SUMMARY:The interaction of certain azo dyes with amylose in aqueous solution is the cause of strong changes of optical rotation (induced Cotton-effects) and of an increase of specific viscosity. Amylose in the presence of Congo Red (1) or Benzo Fast Red F (2) behaves like a polyelectrolyte. These findings are explained in terms of sterically ordered association between amylose and dye-stuffs. Some other dyes (i.e. Azoblue (3) or Calcon (4)) have no influence neither on the viscosity nor on the chiroptical properties. Obviously in these cases the structural requirements for association are not fulfilled. Those dyes which induce Cotton effects and change the viscosity of amylose, form thermoreversible gels with poly(viny1 alcohol).
Part one describes general aspects which must be considered when discussing the chemical analysis of polymers. By means of examples taken from literature, some fundamental procedures are illustrated, for example, color reactions, complex formation, degradation reactions (thermal, oxidative, solvolytic degradation), and polymer‐analogue reactions. Part two describes our own investigations on analysis of different vinyl acetate copolymers having the general formula . The method is based on the elimination of acetic acid by melting the copolymer with p‐toluene‐sulfonic acid. The acetic acid can be determined by potentiometric titration or gas chromatography. The method may be used for soluble and insoluble copolymers (with R:H; OH; phenyl; C2H5COO) and graft copolymers (i.e., poly(vinyl chloride)) containing 0.2 to 100% vinyl ester. With copolymers from vinyl esters and acrylic esters (R; COOR'), alkaline hydrolysis followed by gas chromatographic determination of the acids and alcohols being formed is more advantageous.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.