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  • 1
    Electronic Resource
    Electronic Resource
    Determination of degree of substitution in sodium carboxymethylcellulose by a reverse dye partition technique (1973)
    s.l. : American Chemical Society
    Analytical chemistry 45 (1973), S. 1775-1776 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60331a035
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  • 2
    Electronic Resource
    Electronic Resource
    Grafting of acrylic acid onto methylcellulose (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1-7 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Pfropfcopolymerisation von Acrylsäure auf Methylcellulose mit Kaliumpersulfat als Initiator wurde untersucht. Dabei wurden die verschiedenen Variablen, die das Ausmaβ der Pfropfung bestimmen, sowie die Löslichkeit der Pfropfcopolymere in verschiedenen Lösungsmitteln und Lösungsmittelgemischen untersucht. Copolymere, bei denen mehr als 20% Acrylsäure aufgepfropft waren, wurden in Wasser unlöslich.
    Notes: Grafting of acrylic acid onto methylcellulose backbone was studied using potassium persulfate as initiator. Different variables affecting the extent of grafting were studied. The copolymers with more than 20% grafting became insoluble in water. The solubility of the graft copolymer in different solvents and mixed solvents was studied.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760101
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of graft copolymeres of methyl cellulose and polyacrylamide by thermogravimetry (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1937-1941 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal stability and degradation kinetics of methyl cellulose, polyacrylamide and methyl cellulose grafted with different amounts of polyacrylamide were investigated by thermogravimetry. Polyacrylamide was found to be more stable than methyl cellulose. The thermal stabilities of the graft copolymeres lie in between these two extremes. The order of reaction, n, and energy of activation, E, of the thermal degradation were determined for all polymer samples. It was found that E for the degradation of polyacrylamide (41,4 kcal/mol = 173,2 kJ/mol) is higher than that of methyl cellulose (31,3 kcal/mol = 131,0 kJ/mol) and that E for the graft copolymers lies in between those of the two homopolymers. The over-all reaction order of the degradation reactions was found to be unity for all polymer samples investigated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850915
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  • 4
    Electronic Resource
    Electronic Resource
    Grafting of methacrylic acid on poly(vinyl alcohol) (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 166 (1973), S. 317-318 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021660129
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  • 5
    Electronic Resource
    Electronic Resource
    Grafting of acrylamide onto methyl cellulose by persulfate ion (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 141-148 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acrylamide was grafted onto methyl cellulose backbone by using potassium persulfate as initiator in aqueous solution, and variables affecting the copolymerization were studied. It was found that efficiency of grafting was maximum at an initiator concentration of 3.7 × 10-4 mole/l. Grafting was found to increase steadily with increase in monomer/polymer ratio and with temperature up to 40°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150114
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  • 6
    Electronic Resource
    Electronic Resource
    Estimation of endgroups in poly(vinyl acetate) and the corresponding poly(vinyl alcohol) to study the hydrolysis reactionDedicated to Professor Dr. H. KÄMMERER on the happy occasion of his 60th birthday (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 148 (1971), S. 1-8 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Art der Verzweigung von Polyvinylacetat wurde mittels einer besonderen Versuchstechnik (reverse dye partition (RDP)) untersucht. Während der Hydrolyse von Polyvinylacetat nahm der Polymerisationsgrad jedesmal ab. Dieser Abbau gehorcht keiner einfachen Bezichung. Vermutlich beruht er auf der Abtrennung von Zweigen, die mit der Hauptkette über Esterbindungen verknüpft waren. In Übereinstimmung hiermit enthielten die kürzeren Polymerketten im Mittel eine Carboxylendgruppe je Kette. Der Vergleich der Endgruppenzahl vor und nach der Hydrolyse diente dazu, die Zahl der Zweige in den Polyvinylacetatmolekülen zu bestimmen.
    Notes: The mode of branching in poly(vinyl acetate) has been studied using reverse dye partition (RDP) technique developed in this laboratory. It has been observed that during hydrolysis of poly(vinyl acetate) the degree of polymerization of the polymer decreases in all cases. This degradation is found to be erratic. It may be caused by the separation of branches which were connected to the main chain through ester linkage. This idea has been confirmed by the detection of average one carboxyl endgroup in the resulting shorter polymer chains.The change in the number of endgroups in the parent and the corresponding hydrolysed polymer has been used as a tool for the estimation of number of branches in poly(vinyl acetate) molecules.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021480101
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  • 7
    Electronic Resource
    Electronic Resource
    Estimation of endgroups in acrylamide polymers by reverse dye partition technique (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 141 (1971), S. 55-61 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine neue Farbstoffverteilungsmethode beschrieben, als umgekehrte Farbstoffverteilung (RDP) bezeichnet, um Carboxyl- und Sulfoxyendgruppen in wasserlöslichen Polyacrylamiden quantitativ zu bestimmen. Die einzelnen experimentellen Bedingungen und theoretischen Erklärungen zu dieser Methode werden erörtert. Die ermittelten Endgruppenzahlen je Polymermolekül stimmen mit einer redikalischen Startreaktion der Polymerisation überein. Insbesondere bestätigen die Ergebnisse die derzeitige Vorstellung, daß die Abbruchsreaktion bei der Polymerisation von Acrylamid hauptsächlich in einer Disproportionierung besteht.
    Notes: A new dye partition method, known as reverse dye partition(RDP)-technique for estimation of carboxyl and sulfoxy endgroups in water-soluble acrylamide polymers has been described. Detailed experimental conditions for the use of the RDP technique have been discussed and plausible theory underlying this technique has been proposed. The estimated numbers of endgroups in the polymers are in agreement with the existing free radical mechanism of initiation of polymerization. Particularly, the results support the existing idea that the termination of polymerization of acrylamide monomer occurs mainly by disproportionation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021410106
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of carboxyl groups in water-soluble copolymers by a reverse dye partition method and calculation of r1 (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 2442-2444 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070844
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  • 9
    Electronic Resource
    Electronic Resource
    Grafting acrylic acid monomer to poly-(vinyl alcohol) and methyl cellulose by ceric ion (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 2079-2086 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A graft copolymer of acrylic acid on poly(vinyl alcohol) was prepared by use of the ceric ion-polyol redox system in aqueous medium. The graft copolymer obtained was water-soluble under the specified experimental conditions. The efficiency of grafting was determined by measuring carboxyl group content (as expected from acrylic acid unit) in the copolymer by applying the newly developed reverse dye-partition technique. The graft copolymer was also characterized by viscosity and solubility measurements. The effect of varying concentration of catalyst, monomer, and grafting time has also been determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070806
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