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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0741-0581
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0741-0581
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The strain of ameba, culture incubation temperature, and phase of ameba growth affected the number of amebostomes present on amebae of Naegleria fowleri. Serial passage of N. fowleri through mice decreased the average number of amebostomes. Amebostomes were shown to be functional by their ability to engulf yeast cells.
    Type of Medium: Electronic Resource
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  • 4
    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 effects of the conditions fiber formation on structural parameters and tensile properties of melt-spun, highly isotactic polypropylene filaments were investigated to determine the feasibility of producing supertenacity polypropylene filaments. Meltspun polypropylene monofilaments were prepared from five highly isotactic polymers (94% or more by extraction), under different conditions of extrusion, quenching, drawing, and annealing. The molecular weight, molecular weight distribution, crystalline structure, crystallinity, crystallite orientation, and total molecular orientation (as expressed by total draw ratio) of the experimental filaments were determined, and the relationships between these structural parameters and the tensile properties of the filaments are discussed in the paper. Several of the experimental polypropylene filaments produced had tenacities greater than 12 g./den. and one of them had a tenacity of 13 g./den. Polypropylene filaments having tenacities greater than 13 g./den. appear feasible. To produce the super-tenacity polypropylene filaments, a polymer with a weight-average molecular weight of about 470,000 was melt spun into undrawn filaments having the paracrystalline structure, and the filaments were drawn to a maximum and annealed. The tenacity of the polypropylene filaments increased with increasing fiber molecular weight. A narrow molecular weight distribution was beneficial, but was not necessary for obtaining high tenacities. High draw after spinning was important in producing high tenacity. The maximum amount that a fiber could be drawn depended upon its molecular weight, the amount of stretch introduced during spinning, and the drawing time and temperature (filament temperature). Filaments having the paracrystalline structure, which was obtained with proper extrusion and quenching conditions, could be drawn more easily than filaments having the crystalline structure, and hence, under equivalent conditions, the former could be drawn more. The more the filaments were stretched during spinning, the lower were their tenacities. The relationship between crystallite orientation and the tensile properties of drawn and annealed filaments stretched during spinning was different from the relationship for drawn and annealed filaments that were not stretched during spinning. The highly drawn filaments contained voids, but they could be removed by proper annealing conditions, which also increased the tenacity of the filaments.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 5
    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: Fiber formation of tetramethylenephenylenethiazole polymers has been investigated by melt-, wet-, and dry-spinning methods. The effects on fiber properties, the molecular weight of the polymer, the method of spinning, and the amount the fiber is drawn after spinning have been studied. The stability of the fibers to strong acids and alkali was also determined. The physical properties and the resistance to ultraviolet and gamma radiations of films of tetramethylenephenylenethiazole polymers were determined and compared with similar properties of some commercial films.
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Seventeen thiazole polymers were prepared by the polycondensation of bis-α-bromoketones with dithioamides, and the polymers were investigated for preparing heat-resistant fibers and films. Tough fibers and films were made from four of the polymers; however, these polymers had low melting points (164-250°C.). All of the other polymers studied except these did not melt below 500°C., and they had excellent thermal stabilities, but they did not have good fiber- and film-forming properties because of their low molecular weights. All of the polymers prepared had some crystallinity. Two of the polymers were soluble in organic solvents; the other were soluble only in strong acids. Model compounds of four of the polymers were prepared, and the properties and structures of the compounds were compared with those of the polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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