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  • 1
    Electronic Resource
    Electronic Resource
    Block polymers from isocyanate-terminated intermediates. II. Preparation of butadiene-∊-caprolactam and styrene-∊-caprolactam block polymers (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2613-2622 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polystyrene-nylon 6 and polybutadiene-nylon 6 block copolymers have been prepared from isocyanate-terminated prepolymers. From extraction and fractionation data the products obtained were found to be mixtures of both homopolymers and pure block copolymer. The polybutadiene-nylon 6 copolymers are extremely pliable at ambient temperatures even at high ∊-caprolactam contents (70-80 wt-%). This is true even though these copolymers show a crystalline melting point at 213°C similar to poly-∊-caprolactam. Presumably this unusual behavior occurs because of the nature of the synthesis which renders the butadiene portion of these copolymers the continuous phase. Plasticity measurements indicate that pliability is dependent on the molecular weight of the block poly-∊-caprolactam.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170121114
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Viscosity-molecular weight relationship for fractionated poly(ethylene terephthalate) (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2905-2915 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(ethylene terephthalate) was separated into 12 fractions of equal size by a stepwise increase in the amount of solvent in the two-phase liquid fractionation system of phenol-tetrachloroethane (PTCE) (1:1) and n-heptane. Various molecular weight parameters of the fractions were measured by osmotic pressure and gel-permeation chromatography. Intrinsic viscosity-molecular weight plots were made for three different solvents at 25°C. Mark-Houwink constants for viscosity-average molecular weight were measured and gave values of K of 2.50, 2.37, and 2.25 × 10-4 dl/g and values of a of 0.73 for 1:1 PTCE, 3:2 PTCE, and o-chlorophenol, respectively. A comparison with the literature values for this polyester was made, and application of the Mark-Houwink equation to the determination of number-average (Mn) and weight-average (Mw) molecular weight of whole polymers is considered.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170121217
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of networks from the peroxide cure of polybutadiene. II. Kinetics and sol-gel (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 1721-1732 
    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 cure of polybutadiene with molecular weights varying from 12,500 to 92,000 g/mole and containing 23-93% of 1,2 microstructure were investigated at two levels of dicumyl peroxide and two temperatures. The relative rates of termination were determined as a function of vinyl content and of reactive additives. Sol-gel measurements showed that molecular weights between crosslinks of less than 100 g/mole could be obtained. Network formation was found to be a polymerization process in which each free radical formed started only one crosslink chain. However, at high initiator levels chain scission did occur during cure.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110719
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    Paper (German National Licenses)
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