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  • 1
    Electronic Resource
    Electronic Resource
    Monomer Solvation of Ion Pairs in Anionic Polymerization (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 273-274 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have studied the rate of disappearance of styrene dilatometrically in the concentration range 3 x 10-1-l x 10 -2 mole I.-1 for the same system at the same temperature and find somewhat more complex behaviour (see Fig. 1). In the region where we can most accurately measure the monomer ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215273a0
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  • 2
    Electronic Resource
    Electronic Resource
    Zusammensetzung braunen Materials aus oxydiertem Nylon 6 (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 103-103 
    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/BF01746822
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  • 3
    Electronic Resource
    Electronic Resource
    The synthesis and characterization of poly(methylene terephthalate)Systematic name: Poly(oxymethyleneoxyterephthaloyl). (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 2129-2139 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(methylene terephthalate) (1GT) has been synthesized via the reaction of cesium or potassium terephthalates with dibromomethane or bromochloromethane in N-methylpyrrolidone at temperatures of 80-125°C. The polymerization was relatively slower with the latter substrate, though the potassium salt was found to be equally as efficient as its cesium counterpart with dibromomethane. The polymer is insoluble in all common polyester solvents, and its high molecular weight nature (DPn ≥ 25) was inferred from elemental analyses and its fiber forming capacity. Thermal analyses indicated that 1GT possesses poor thermal stability and decomposes rapidly during melting, the initial process being thought to be the splitting out of formaldehyde. 1GT polymers were shown to contain a homologous series of cyclic oligomers (from dimer to decamer); the two most predominant were tentatively identified as the cyclic trimer and tetramer. No change in the cyclization efficiency was observed when the potassium counterion was substituted for cesium with Br CH2 Br whereas a drastic reduction in the cyclic content was obtained using Br CH2 Cl (with Cs+). The two most important features of the polymerization are the insensitivity of the reaction to the stoichiometric equivalence of the reactants and the production of reasonably high molecular weights at low conversions. It is suspected that the polymerization might be occurring through an interfacial mechanism.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260811
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  • 4
    Electronic Resource
    Electronic Resource
    Poly(methylene sebacate)Systematic name: Poly(oxymethyleneoxysebacoyl).: Synthesis and characterization (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 313-321 
    Details
    ISSN: 0887-624X
    Keywords: polyester ; cesium ; dicarboxylate ; bromochloromethane ; N-methpyrrolidone ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of poly(methylene sebacate) was carried out via the reaction of cesium sebacate with bromochloromethane in N-methylpyrrolidone over a range of temperatures (55-130°C). A number of polymers having limiting viscosity numbers in the range of 0.29-0.94 dL g-1 (CHCl3; 25°C) were characterized by elemental analyses, 1H- and 13C-NMR, DSC, and GPC techniques. The polymerization was found to be very rapid at 100°C, being complete in ca. 15 min. and was relatively insensitive to the stoichiometric ratio of the monomers. As high molecular weight polymers were produced without the quantitative conversion of the reactants, the polymerization is considered to be occurring by an interfacial mechanism.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300216
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  • 5
    Electronic Resource
    Electronic Resource
    The dry spinning of dibutyrylchitin fibers (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 2459-2466 
    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: Dibutyrylchitin was prepared by treatment of krill chitin with butyric anhydride in the presence of perchloric acid as a catalyst of reaction carried out at 25 to 30°C. Dibutyrylchitin is easily soluble in several organic solvents, such as acetone, alcohols, methylene chloride, and dimethylformamide. Samples of polymers with molecular weights high enough to form fibers were obtained, and dibutyrylchitin fibers were made by a simple method of dry spinning its 20 to 22% solutions in acetone. Select properties of dibutyrylchitin fibers were investigated. It was found that dibutyrylchitin fibers had tensile properties similar to or better than those of chitin and some chitin derivatives described in the literature. An attempt to convert dibutyrylchitin fibers to chitin fibers was made. It was found that chitin fibers with good tensile properties could be obtained by alkaline hydrolysis of dibutyrylchitin fibers without destroying the fiber structure. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070581313
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  • 6
    Electronic Resource
    Electronic Resource
    Properties of oligomers present in poly(ethylene terephthalate) (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4719-4733 
    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: Heat treatment of polyester yarns induces the selective crystallization of the cyclic trimer [(GT)3] in the form of polygonal solids on the fiber surfaces. At the temperature studied, namely, 200°C, the diffusion rate of (GT)3 appears to be very rapid. Small quantities of the cyclic tetramer were also found. The total extractable oligomer content of the samples is reduced considerably after annealing at 200°C, mainly due to solid phase polymerization. Exposure to methylene chloride vapor also causes cyclic oligomers to diffuse to the fiber surface. The migration of (GT)3 is again very rapid. Larger cyclics also diffuse to the surface in appreciable quantities. Solvent exposed samples, unlike annealed ones, exhibit irregular crystal shapes and sizes on their surfaces. The moisture regain of the extracted oligomers is less than that of the polyester. It is suggested that this is due to the oligomers being in a crystalline form.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320436
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of varied reactant ratios on the polymeric structures of stannous dicarboxylates (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 1194-1199 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Some polymeric Sn(II) dicarboxylates have been produced with good yields from aqueous solution via a double decomposition reaction using varied nonstoichiometric molar proportions of the reactants. They were obtained as highly viscous pale yellow liquids formed into separate denser phases in the precipitation bath. The highly viscous precipitates were drawn directly into fibers. Meltspun polymeric stannous dicarboxylates produced fibers which were only flexible above the glass transition temperature, Tg.When the aliphatic dicarboxylic acids were replaced with their aromatic counterparts similar highly viscous liquids were obtained, but they solidified almost at the instant of formation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760311607
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  • 8
    Electronic Resource
    Electronic Resource
    The kinetics of anionic polymerization of styrene and α-methylstyrene. Effects of counter-ion and solvent (1965)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 89 (1965), S. 257-262 
    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 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1965.020890119
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  • 9
    Electronic Resource
    Electronic Resource
    The purification of styrene (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 891-892 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; 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.1965.110031021
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of the reaction of poly(α-methylstyryl sodium, potassium, and cesium) with t-butyl chloride in tetrahydrofuran (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 869-878 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the reaction of “living” poly(α-methylstyrl sodium, potassium, and cesium) with t-butyl chloride have been studied spectrophotometrically in tetrahydrofuran (THF) in the temperature range 283-303 K. The reactions, when the free ions present in solution are suppressed by tetraphenylboron salt, are first order with respect to both living ends and halide concentrations. Additions of tetraphenylboron salts produce a slight retardation effect on the rate of reaction in the case of sodium, indicating only a small contribution of free ions to the overall rate; in the case of potassium, there is no apparent effect. Analysis of the data indicates that the free ion is approximately 30 times more reactive than the sodium ion pair. The Arrhenius plots for contact ion-pair termination are linear and the activation energies and preexponential factors determined are ENa+ = 38.6 kJ mole-1, log ANa+ = 4.44 liter mole-1 sec-1 and Ek+ = 46.0 kJ mole-1, log Ak+ = 5.10 liter mole-1 sec-1. The reaction mechanism is interpreted in terms of elimination plus some side reaction to produce two unexpected reaction products - isobutane and a 315-320-nm absorbing grouping in the polymer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190402
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