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  • 1
    Electronic Resource
    Electronic Resource
    Thermal properties of resin copolymers derived from o-hydroxy acetophenone (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 373-379 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A variety of crosslinked resin copolymers have been synthesized by condensing o-hydroxy acetophenone with formaldehyde and chloro-substituted benzoic acids and anilines in the presence of acidic and basic catalysts. The physico-chemical properties of the resins are reported. The thermogravimetric analysis method was used to study the thermal behaviour of the resins; the evolution of kinetic parameters and degradation mechanism was also investigated. Resins from chlorobenzoic acids showed clear two-step degradation neglecting moisture loss, whereas those from chloro anilines gave a somewhat continuous sigmoid. The effect of reaction conditions like monomer, molar ratio, and catalyst is also reported. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500301
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  • 2
    Electronic Resource
    Electronic Resource
    Light scattering studies of viscose solution (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 102 (1967), S. 217-221 
    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: Viskose wurde fraktioniert, und die Fraktionen sowie das rohe Polymere wurden durch Streulichtmessung charakterisiert. Bestimmt wurden das Molekulargewicht, die Gestalt und der mittlere Fadenendenabstand des rohen Polymeren und seiner beiden Fraktionen. Es wurde gefunden, daß sowohl das unfraktionierte Polymere als auch die daraus erhaltenen Fraktionen statistische Knäuel darstellen. Die Molekulargewichte des Ausgangspolymeren und der Fraktionen liegen bei 5,65·105 bzw. 1,205·105bzw. 3,63·106. Für das rohe Polymere beträgt der mittlere Fadenendenabstand 1435 Å, für die beiden Fraktionen 1997 Å bzw. 1614 Å.
    Notes: Viscose has been fractionated and the fractions as well as the gross polymer have been characterized by the light scattering technique. The molecular weight, shape and the root mean square end to end distance of the gross polymer and its two fractions have been determined. The gross polymer as well as the fractions obtained therefrom have been found to possess random coil configuration. The molecular weight of the gross polymer and its two fractions are 5.65·105, 1.205·106, and 3.63·105, respectively. The root mean square end to end distance is 1435 Å. for the gross polymer, and 1997 Å. and 1614 Å. for the first two fractions, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021020119
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  • 3
    Electronic Resource
    Electronic Resource
    Light scattering measurements of cellulose solutions in concentrated acids (1956)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 20 (1956), S. 218-223 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1956.120209425
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  • 4
    Electronic Resource
    Electronic Resource
    Dilute solution properties of sodium amylopectin xanthate (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 2159-2167 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sodium amylopectin xanthate, prepared by xanthation of potato amylopectin in alkaline medium, was fractionated and the fractions in 1M NaOH were characterized by viscometry and light scattering. The expansion factor α was determined from the expression due to Orofino and Flory. The value of a of the Mark-Houwink relation, [η] = KMa, was also determined. Its weight-average molecular weight, end-to-end distance, branching, and other parameters in alkali solution were also evaluated. From the data, it was concluded that the sodium amylopectin xanthate molecule had a polydisperse random-coil chain configuration in 1M NaOH and had no tendency to aggregate in this medium.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.150100726
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular parameters of sodium cellulose xanthate in dilute solution (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 769-777 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular parameters of sodium cellulose xanthate in NaOH solution have been determined by means of light scattering and viscometry. The effect of the degree of substitution on the molecular configuration of sodium cellulose xanthate has been studied for three series of samples of varying degree of substitution. The expansion factor has been determined from the expression due to Orofino and Flory. The effective bond length b and the ratio of the unperturbed dimension to the dimension assuming free rotation of the chain units (R̄o2/R̄f2)1/2, have also been determined. It is concluded that sodium cellulose xanthate in dilute solution is a loosely coiled molecule, comparable to other cellulose derivatives in chain stiffness.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050406
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  • 6
    Electronic Resource
    Electronic Resource
    Polyelectrolyte behavior and macromolecular properties of sodium amylopectin xanthate in dilute solution (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 1713-1724 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sodium amylopectin xanthate was prepared by xanthation of potato amylopectin in alkaline medium. The pure product was characterized by I2 solution and ultraviolet spectra of the xanthate groups. The polyelectrolyte behavior of Na amylopectin xanthate in aqueous and salt solutions was investigated by viscometry and light scattering. Its polyelectrolyte behavior in aqueous solution as studied viscometrically was completely different from that of Na amylose xanthate, which is characteristic of linear polyelectrolyte molecules. This difference in behavior could be partly due to the branched structure of amylopectin molecule. A dissymmetry study of Na amylopectin xanthate in aqueous and salt solutions, however, showed that Na amylopectin xanthate molecule underwent expansion in water by about 1.3 times its linear dimension in 0.5M NaCl (unperturbed value). Light-scattering measurements confirmed that the Na amylopectin xanthate molecule had a polydisperse random-coil chain configuration in 0.25M NaCl. Its molecular weight, end-to-end length, and other parameters in salt and alkali solutions were also determined, and the data were then compared with those of Na amylose xanthate in the same media. The solution behavior of Na amylopectin xanthate in 1M NaOH was further investigated and linear expansion factor α, excluded volume factor A2MW/[η], and Flory's hydrodynamic constant ϕ were evaluated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150080710
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  • 7
    Electronic Resource
    Electronic Resource
    Physicochemical and macromolecular properties of sodium amylose xanthate in dilute solution (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1121-1134 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sodium amylose xanthate has been studied in dilute solution. Potato starch was fractionated for this purpose into amylose and amylopectin fractions. Amylose was xanthated in solution under alkaline conditions and the Na amylose xanthate was then characterized by reaction with I2 solution and ultraviolet spectra of the xanthate groups determined. Stability of the xanthate in alkaline condition under both oxygen and nitrogen atmospheres was also investigated. From light scattering measurements of dilute salt solutions of Na amylose xanthate, the weight-average molecular weight Mw as well as the molecular dimensions were determined. In 0.11M NaCl, which conforms to the θ solvent, Na amylose xanthate molecules appear to have a random-coil configuration. Two other configurational parameters, such as the effective bond length b, and the steric factor σ, i.e., (R02)1/2/(Rf2)1/2, where (R02)1/2 is the Root-mean-square end-to-end distance in the unperturbed state and (Rf2)1/2 is the unperturbed value calculated on the assumption of free rotation about each intermonomer C—O bond of the amylose chain were also calculated and found to be 6.24 and 1.020, respectively. It is thus concluded that the amylose chain in Na amylose xanthate behaves as a typical flexible coil in dilute salt solution.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060505
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular parameters of sodium amylose xanthate in dilute solution (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 77-84 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular parameters of sodium amylose xanthate in 1N NaOH solution have been determined by means of light scattering and viscometry. The expansion factor, α, has been determined from the expression due to Orofino and Flory. The value of a of the Mark-Houwink relation, [η] = KMa, has been determined. The Stockmayer-Fixman relationship has been used to evaluate the unperturbed dimension of the chain. The effective bond length b, Kuhn-Kuhn equivalent chain segment length Am and the steric factor σ, i.e., the ratio of the unperturbed dimension to the dimension assuming free rotation of the chain \documentclass{article}\pagestyle{empty}\begin{document}$(\bar R_o^2 )_z ^{1/2} /(\bar R_f^2 )^{1/2}$\end{document} have also been determined. From these data, it is concluded that sodium amylose xanthate in 1N NaOH solution behaves as a loosely coiled molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.150100106
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