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  • Polymer and Materials Science  (12)
  • Column liquid chromatography
  • Engineering General
  • Life and Medical Sciences
  • pearl millet
  • 1965-1969  (12)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies of the conformation of carboxymethyl amylose in aqueous solutionsThis work was supported by a grant from the Corn Industries Research Foundation. (1965)
    New York : Wiley-Blackwell
    Biopolymers 3 (1965), S. 185-193 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In an attempt to clarify certain questions of the configuration of amylose in aqueous solution, carboxymethyl groups were introduced into corn amylose (degree of substitution ca. 0.8) and certain properties of the derivative (CMA) studied. The intrinsic viscosity exhibits a strong increase between pH 2 and 6 but remains constant at higher pH. A pH 6 and above, CMA exhibits typical polyelectrolyte behavior. CMA does not form a complex with iodine at pH 6 or above but does form a violet-colored complex at low pH. The absorption maximum of the CMA complex lies at a somewhat lower wavelength (550 mμ) than that of the complex formed by the parent amylose. The reduced viscosity and specific optical rotation of the CMA-iodine complex remains constant up to a concentration of 1.2 mg. iodine/100 mg. CMA, then both properties decrease with further increases of iodine content. All of the above results and hydrogen ion titration behavior are in agreement with the hypothesis that CMA exists as a coil of short helical segments in acid solution and that these helical segments break down on ionization of the carboxyl groups. The specific optical rotation of CMA increases between pH 2 and 6, remains constant between pH 6 and 12, and decreases above pH 12. This later result shows that the similar decrease in rotation seen in amylose cannot be attributed, at least entirely, to a helix-coil transition. There must be another effect on optical rotation, direct or indirect, of the ionization of hydroxyl groups.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360030206
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  • 2
    Electronic Resource
    Electronic Resource
    Photocrosslinking of stilbene-modified polymers (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 2247-2255 
    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: The reactions of trans-2,5-dimethoxy-4′-aminostilbene with poly(maleic anhydride-co-methylvinyl ether) and trans-2,5-dimethoxy-4′-isocyanatostilbene with poly(oxy-1,4-phenyleneisopropylidene:1,4-phenyleneoxy-2-hydroxytrimethylene) yield polymeric systems which undergo rapid crosslinking upon short exposure to ultraviolet light. The extent of photocrosslinking as a function of exposure time was determined by the decrease of the trans-stilbene ultraviolet absorption at 350 nm.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070131018
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  • 3
    Electronic Resource
    Electronic Resource
    Grafting of acrylonitrile onto cellulose initiated by ceric ion (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 2649-2656 
    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: Acrylonitrile was grafted onto cellulose with the use of ceric salt as initiator and the grafting was found to be maximum at 0.6N acid concentration. The effect of monomer and initiator concentration on the extent of grafting was studied. A new method for quantitative estimation of extent of grafting on cellulose was developed and its validity was established. The grafted samples with 20% increase in weight were found to be highly resistant to microorganisms.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070131212
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on the helical conformational of amylose and possible interconversionsContribution No. 263 from the Centre of Advanced Study in Biophysics, University of Madras, Madras-25, India. (1969)
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 313-323 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nonbonded energy (van der Waals) was computed for isolated helical amylose chains as a function of the dihedral angles (φ,ψ), i.e., the relative orientations of the glucose residues in the polysaccharide chain. In conformity with x-ray data, different helical conformations have been proposed for different crystalline modifications of amylose. Right-handed helical conformations were preferred for 71.13, 61.33, and 42.65-type helices from minimum energy considerations. The hydrogen bond search reveals the possibility of formation of strong O—H⃛O type hydrogen bonds between contiguous residues in the polymer chain for 61.33 and 71.13 helices. Smooth transition from a 71.13 to a 61.13 helix is possible with small changes in the values of (φ,ψ) and without the loss of intramolecular hydrogen bonds, whereas all the intramolecular hydrogen bonds will be broken during the conversion from 61.33 to 42.65 helix.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360080303
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  • 5
    Electronic Resource
    Electronic Resource
    Conformational studies of β-D-1,4′-xylanContribution No. 262 from the Centre of Advanced Study in Biophysics, University of Madras, Madras-25, India. (1969)
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 305-312 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nonbonded interaction energy was computed for xylobiose and xylan as a function of the dihedral angles (φ,ψ). The energy maps indicate that interactions higher than the second neighbor are negligible. Of the four possibilities, the left-handed helical conformation with (φ,ψ) = (63°,25°) is of the lowest energy. The hydrogen bond search and the energy maps reveal that the xylan helix is stabilized mainly by van der Waals forces. The allowed region map shows that the freedom of rotation of the monomer units in cellulose is more restricted than that of the monomer units in xylan, because of the presence of the —CH2OH group in the former. The intramolecular hydrogen bond of the O5⃛O3′ type is stronger in cellulose.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360080302
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  • 6
    Electronic Resource
    Electronic Resource
    Configurational statistics of polysaccharide chains. Part I. AmyloseContribution No. 264 from the Centre of Advanced Study in Biophysics, University of Madras, Madras-25, India. (1969)
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 325-333 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The conformational energy of amylose molecule was computed as a function of rotations φ and ψ about interunit glycosidic bonds. The characteristic ratio 〈r2〉0/Nl2V of the mean-square end-to-end distance of the unperturbed chain to the product of n, the number of glucose residues in the chain and the square of the virtual bond length lV = 4.2 Å calculated for amylose chain is about 6.9, which is in good agreement with the experimental value (6.6 ± 0.2). The value of this ratio calculated for free rotation about the inter unit glycosidic bond is 1.1. The conformational map reveals that the rotations of pyranose units about the interunit glycosidic bonds are highly restricted; this tends to lock these units in a preferred orientation. From the probability of occurrence of the glucose residue conformations it is concluded that amylose exists as a random coil with short helical sequences in neutral aqueous solutions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360080304
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  • 7
    Electronic Resource
    Electronic Resource
    Studies in effect of γ-radiation on synthetic fibres-I (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 6 (1969), S. 127-135 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Einwirkung von γ-Strahlen auf Polyester- und Polyamid-Garn in verschiedenen Dosen in Gegenwart sowie unter Ausschluß von Luft untersucht. Die Veränderung in den Fasereigenschaften wie Schmelzpunkt, relative Viscosität, Festigkeit und Farbstoffaufnahme wurde ermittelt. Die in dieser Arbeit gefundenen Ergebnisse zeigen, daß - obwohl mit höheren Strahlungsdosen die Faserstoffe beschädigt wurden - es mit kontrollierter Bestrahlung jedoch möglich ist, einige Fasereigenschaften ohne wesentlichen Faserabbau zu verbessern.
    Notes: Polyester and polyamide yarns have been exposed to γ-rays with varying doses of irradiation, both in vacuum and in the presence of air. The changes in such properties of the polymers as melting point, relative viscosity, tensile strength, and dye absorption have been investigated. The results of the present study indicate that, though with higher doses there is degradation of the polymer, under controlled conditions certain desirable properties of the fibre are greatly improved without affecting the mechanical strength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1969.050060112
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of normal stresses in simple shearing, flow of ellis fluid (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 393-394 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130212
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  • 9
    Electronic Resource
    Electronic Resource
    Solid-state polymerization of trioxaneThis work supported in part by the U.S. Atomic Energy Commission. (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 2579-2589 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Trioxane has been polymerized by irradiation with Co60 γ-rays in the temperature range 45-55°C. The data are extremely difficult to reproduce in spite of great precautions in sample preparation. The reaction reaches a limiting conversion, generally about 40%, but conversions as high as 96% have been observed. The viscosity of the polymer decreases with increasing conversion. Post-irradiation heating of monomer irradiated at low temperature (〈30°C.) also leads to limiting conversions but much higher viscosity products. The polymerization has also been studied under pressure. Pressure applied to monomer prior to irradiation leads to higher conversions and higher viscosity polymers. In the post-irradiation polymerization technique, application of pressure after irradiation reduces the polymer yield to zero in almost every instance.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030715
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  • 10
    Electronic Resource
    Electronic Resource
    Graft polymers: Chain transfer and branching (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2681-2691 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The vinyl monomers, methyl methacrylate, ethyl methacrylate, and methyl acrylate were polymerized in the presence of chlorinated rubber or poly(vinyl chloride) in homogeneous solution with benzoyl peroxide as catalyst. A graft polymer was formed by a chain-transfer reaction involving the growing polymer radicals to the backbone of chlorinated rubber or poly(vinyl chloride), in addition to homopolymer from the monomer. The homopolymer was isolated from the polymer mixture by fractional precipitation from methyl ethyl ketone solution with methanol as precipitant. The chain-transfer constants for the branching reactions were evaluated. The ratios kp/(kt)1/2 for the grafting reactions were obtained by a correlation of chain-transfer constants with the extent of branching. The chain-transfer data were correlated on the basis of an extension of the Q-e scheme of Alfrey and Price to polymer-polymer transfer reactions. Specific effects due to the backbone are found to have considerable influence on the course of the chaintransfer reactions and kp/(kt)1/2 of the grafting reactions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150051018
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