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  • 1
    Electronic Resource
    Electronic Resource
    Tensile Properties of Crystalline Polymers: Random Copolymers of Ethylene (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1407-1421 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00109a012
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  • 2
    Electronic Resource
    Electronic Resource
    Comments on Paper "Raman Spectroscopy Employed for the Determination of the Intermediate Phase in Polyethylene". (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 2988-2989 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00112a054
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology of Blends of Linear and Long-Chain-Branched Polyethylenes in the Solid State: A Study by SANS, SAXS, and DSC (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 3156-3167 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00113a018
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  • 4
    Electronic Resource
    Electronic Resource
    A Re-examination of the Relation between the Melting Temperature and the Crystallization Temperature: Linear Polyethylene (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 3205-3213 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00113a024
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  • 5
    Electronic Resource
    Electronic Resource
    The supermolecular structure of ethylene-vinyl acetate copolymers (1998)
    Springer
    Polymer bulletin 41 (1998), S. 463-470 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The supermolecular structures, as measured by small-angle light scattering, were determined as a function of branching content and quenching temperature for a series of ethylene-vinyl acetate copolymers. The morphological pattern that evolved was similar to that of random ethylene-1-alkene copolymers and long-chain branched polyethylenes. The structure of the lamellar crystallites determines whether spherulites develop and how well they are organized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050388
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  • 6
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of metallocene type polypropylenes (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 913-929 
    Details
    ISSN: 1572-8943
    Keywords: crystallization kinetics ; metallocene type poly(propylenes)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystallization kinetics from the melt of metallocene type isotactic poly(propylenes) having the same chain defect concentration and molecular weights ranging from 68480 to 288430 have been studied by differential scanning calorimetry. The crystallization rates and the variation of the rates with crystallization temperature follow a pattern that is basically independent of molecular weight. This result contrasts with the molecular weight dependence on the crystallization rate observed in linear polyethylene, random ethylene copolymers as well as other semicrystalline systems. Most significant is the fact that the metallocene poly(propylenes) show apparently significantly higher σeσu products than do the Ziegler type fractions of matched molecular weight and defect concentration. This difference can be interpreted as the metallocene type crystallites having higher effect on surface interfacial free energies than the Ziegler type, or can result from the two different chain types having different sequence propagation probabilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979439
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of the deformation temperature on the tensile properties of polyethylenes (1998)
    Springer
    Journal of materials science 33 (1998), S. 2255-2268 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The force–elongation curves and key tensile parameters of a set of polyethylenes were studied over the temperature range from − 100°C to their respective melting temperatures, at a fixed strain rate. The polymers chosen possessed a diverse molecular architecture and constitution. They were crystallized in such a manner as to generate a wide range in crystallinity levels and supermolecular structures. Unique to this work are accompanying dilatometric studies. These enabled the changing level of crystallinity with temperature to be monitored. The force–elongation curves that were obtained varied in a systematic manner with the chain structure and deformation temperature. The yield stresses of all the polymers were very similar to one another in the region of the glass transition temperature. However, they diverged at elevated temperatures, depending on the chain structure, linear or branched, and the level of crystallinity. The change in the ultimate properties, the draw ratio, λB, after break and the true ultimate tensile strength, with deformation temperature could be correlated with the changing level of crystallinity. The temperature dependence of these properties are strongly dependent on molecular weight and, except for the very highest molecular weights, a maximum is observed. Possible mechanisms that govern the ultimate properties are presented and discussed. The temperature dependence of the yield stress could not be correlated with the dislocation theory that has been developed to describe yielding. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004379102567
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of molecular weight and crystallite structure on yielding in ethylene copolymers (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 213-223 
    Details
    ISSN: 0887-6266
    Keywords: stress-strain ; yield ; crystallite ; ethylene copolymer ; superstructure ; lamellae ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Nominal stress-strain curves of a series of random ethylene-hexene copolymers having narrow composition and most probable molecular weight distributions were investigated. A series of such molecular weight copolymers with a constant concentration of branches were crystallized under a variety of conditions. In each molecular weight series the level of crystallinity was approximately constant. Particular attention was focused on the yield region and the nature of the yielding process. It was found, quite surprisingly, that the yield stress was not solely dependent on the crystallinity level. Moreover, the shape of the force-elongation curve in the yield region was very dependent on the molecular weight and the crystallization mode. These changes in yielding correlated quite well with the overall crystallite structure that was characterized by thin section transmission electron microscopy. The orthorhombic unit cell of polyethylene was maintained in all the samples despite the changes that occurred in the overall crystallite structure. © 1997 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    The double yield in the tensile deformation of the polyethylenes (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 1117-1123 
    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: Double yields, as well as other complex yielding behavior, that are observed during the tensile deformation of the polyethylenes have been studied in a systematic manner. The conditions under which such yielding is observed were established by studying a set of linear polyethylenes and well-characterized ethylene copolymers of narrow molecular weight and composition distributions. A wide range in crystallinity levels were developed and the rate of deformation and the deformation temperature were varied. These experimental results make clear why such complex yielding processes are not always observed. A qualitative explanation, based on the postulate of a partial melting-recrystallization process during deformation, is given that encompasses all of the experimental data.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760351308
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  • 10
    Electronic Resource
    Electronic Resource
    A study of the dilation of the unit cell of metallocene isotactic poly(propylenes): The monoclinic form (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 2511-2521 
    Details
    ISSN: 0887-6266
    Keywords: isotactic poly(propylenes) ; unit-cell density ; crystal structure ; unit-cell parameters ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The lattice parameters of a series of monoclinic metallocene poly(propylenes) of constant molecular weight are measured as a function of defect content, that vary between 0.3 and 2.35 total defects per 100 monomeric units. The parameters are also measured as a function of molecular weight for a fixed defect content and as a function of the crystallization temperature. The b axis is found to increase with decreasing isothermal crystallization temperature whereas only small changes are found for samples rapidly crystallized. The a and c axis showed basically no variation with crystallization temperature. The parameters of the unit cell were essentially constant with varying defect content in the poly(propylene) chain. Lack of observed effect on the dilation of the unit cell by increasing defects is a consequence of the rapid crystallization required to ensure formation of monoclinic crystals. The unit cell parameters increased as a mild function of the molecular weight. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2511-2521, 1997
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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