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  • 1
    Electronic Resource
    Electronic Resource
    Vinylpolymerisation von Acrylnitril mit dem H2CrO4/1,2-Propandiol-System in wäßrigem HClO4 (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 1144-1144 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01549953
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  • 2
    Electronic Resource
    Electronic Resource
    Redoxpolymerisation von Acrylnitril: Kinetik der mit dem Redoxsystem aus 1-Propanol und Chromsäure ausgelösten Reaktion (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 715-715 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01784509
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical modification of lignocellulosic fibers I. Functionality changes and graftcopolymerization of acrylonitrile onto pineapple leaf fibers; their characterization and behavior (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 1675-1685 
    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: This paper is an attempt to examine the commercial significance of an agro-waste “pineapple leaf fiber” (PALF). The quality enhancement of PALF has been tried through chemical modifications. Functionality changes in the above fiber have been done through mercerization, cyanoethylation, oxidation, and graftcopolymerization with acrylonitrile, using cericion as an initiator at varying concentrations of monomer, initiator, and mineral acid at a number of temperatures for various time intervals. The modified fibers have been characterized by FTIR spectroscopy and viscosity measurements. The extent of moisture regain, acid-alkali solubility, tensile modulus, dye-uptake ability, and thermal stability of the resulting materials have been tested and compared with the parent fiber. The significance of such chemical modification in the context of better textile performance and reinforcing behavior of the product in FRP has been discussed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070521202
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of chemical modification on FTIR spectra. I. Physical and chemical behavior of coir (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 745-752 
    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: Coir fibers were chemically modified through alkali treatment, and crosslinking with formaldehyde, para-phenylene diamine, phthalic anhydride, and combined crosslinking-cyanoethylation reactions in appropriate solvent and catalyst. The parent and chemically modified coir were characterized by FTIR spectra. The percent moisture regain, tensile strength, and behavior toward some chemical reagents (solubility %) of parent and chemically modified fibers have also been evaluated. The modified fibers showed significant hydrophobicity, improved tensile strength, and good chemical resistance. © 1995 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580407
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of methyl methacrylate initiated by the redox system Mn3+/thioglycollic acid (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 41-48 
    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 kinetics of aqueous polymerization of methyl methacrylate initiated by the redox system Mn3+-thioglycollic acid was studied in sulfuric acid in the temperature range of 35-50°C, and the rates of polymerization Rp and Mn3+ disappearance, etc., were measured. The effect of certain water-miscible organic solvents, neutral electrolytes, and complexing agents on the rates of polymerization has been investigated. A mechanism involving the formation of a complex between Mn3+ and thioglycollic acid whose decomposition yields the initiating free radical with the polymerization being terminated by the metal ion has been suggested.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260105
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  • 6
    Electronic Resource
    Electronic Resource
    Trivalent manganese chelate-initiated graft copolymerization of methyl methacrylate onto silk fibersFinal correction received May 11, 1981 (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 2221-2228 
    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 graft copolymerization of methyl methacrylate onto silk fibers was investigated in aqueous solution using Mn3+ acetyl acetonate [Mn(acac)3] as initiator. The rate of grafting was determined by varying monomer, acidity of medium, temperature, and reaction medium. The graft yield increases significantly with increase of [Mn(acac)3] concentration up to 0.01M, and with further increase of [Mn(acac)3] the graft yield decreases. The effect of the increase of monomer concentration brings about a significant enhancement in the graft yield, and with further increase the graft yield decreases. The rate of reaction is temperature dependent; with increasing temperature, the graft yield increases. Among the solvent composition studied, a water/solvent mixture containing 10% of the solvent seems to constitute the most favorable medium for grafting, and, with further increase of solvent composition, the graft yield decreases. The effect of some inorganic salts, organic solvents, and complexing agents has been investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260711
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  • 7
    Electronic Resource
    Electronic Resource
    Modification of polysaccharides: Degradation and graft copolymerization onto dextran (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 129 (1985), S. 11-29 
    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: Ein wasserlösliches Muco-Polysaccharid, „Dextran“, wurde selektiv abgebaut und mit Acrylamid sowie Methylmethacrylat pfropfcopolymerisiert. Mit Cer(IV)-Ionen als Initiator wurden ein niedermolekulares Modell-Dextran und außerdem Dextran-g-polyacrylamid- und Dextran-g-polymethylmethylmethacrylat-Copolymere hergestellt. Der selektive Kettenabbau und die Pfropfcopolymerisationen wurden mit verschiedenen Konzentrationen an Ce(IV) und Monomeren sowie bei verschiedenen Temperaturen durchgeführt. Der Verlauf des Abbaus durch Kettenspaltung wurde viskosimetrisch verfolgt. Das niedermolekulare Modell-Dextran und die Copolymeren wurden durch übliche Methoden gereinigt. Ihre physikalischen und chemischen Eigenschaften wurden bestimmt und mit denen der Ausgangssubstanzen verglichen. Die Aktivierungsenergie für den Kettenabbau und andere verwandte thermodynamische Parameter wurden errechnet.
    Notes: A water soluble muco-polysaccharide, “dextran”, was subjected to selective degradation and graft copolymerized with acrylamide and methylmethacrylate. Using ceric ions as initiator a low molecular weight model dextran and dextran-g-poly(acrylamide) as well as dextran-g-poly(methylmethacrylate) copolymers were prepared. The selective chain degradation and the graft copolymerizations were carried out at varying concentrations of Ce(IV) and monomer and varying temperatures. The course of degradative chain cleavage has been followed by viscometry. The low molecular weight model dextran and the copolymers were purified by usual methods. Their physical and chemical properties were tested and compared with the base. The energy of activation for the chain degradation and other related thermodynamic parameters have been evaluated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051290102
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  • 8
    Electronic Resource
    Electronic Resource
    Polymerization of acrylonitrile: Kinetics of the reaction initiated by the Fe2+/BrO3- redox system (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 487-493 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The aqueous polymerization of acrylonitrile initiated by the bromate - ferrous redox system in aqueous sulfuric acid was studied under nitrogen atmosphere. The rate of polymerization increased with increasing concentration of ferrous in the range of 0.25-1 × 10-2M. The percentage of conversion increased with increasing concentration of the catalyst, but beyond 2.5 × 10-3M there was a decreasing trend in the rate of polymerization. The rate varied linearly with [monomer]. The initial rate of polymerization as well as the maximum conversion increased within the range of 1-2.5 × 10-3M KBrO3, but beyond 2.5 × 10-3M the rate of polymerization decreased. The initial rate and limiting conversion increased with increasing polymerization temperature in the range 30-40°C; beyond 40°C they decreased. The effect of certain neutral salts, water-miscible solvents, complexing agents, and copper sulfate concentration on the rate of polymerization was investigated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190222
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