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  • 1
    Electronic Resource
    Electronic Resource
    Strain induced oriented polymer blending: morphology-property relationship in polyethylene-polybutene-1 systems (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 312-318 
    Details
    ISSN: 1435-1536
    Keywords: Polymer blends ; morphology ; mechanical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present paper deals with the studies on the polyethylene-polybutene-1 blend system and characterizes two issues, namely: (i) to present a method for preparing reinforced composite polymeric materials; (ii) to investigate the factors affecting the mechanical properties in the non-compatible crystalline blends. In order to investigate the structure-property relationship of highly oriented thin films of polyblends in the whole range of composition, the morphologies have been characterized using electron microscopy. The corresponding changes in the mechanical and thermal properties have also been studied. It is demonstrated that the observed anomolous behaviour in mechanical properties of the blends with the composition is mainly due to the resulting changes in the type of dispersion of the phases and their morphologies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447970
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  • 2
    Electronic Resource
    Electronic Resource
    Electron microscopic studies of SBS block copolymers I. A method to study the temperature dependence of phase separation (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 847-853 
    Details
    ISSN: 1435-1536
    Keywords: Block copolymer ; morphology ; electron microscopy ; temperature dependence of phase mixing ; nucleating agents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The potential applicability of a “Film Formation Method of Crystal Growth” to the study of morphological aspects of amorphous polymers was investigated using transmission electron microscopic techniques. A wide variety of morphologies of styrene-butadiene-styrene triblock copolymer can be achieved by varying the solvent power and film preparation temperatures. The effect of film preparation temperature indicates that below 100 °C (the glass transition temperature of polystyrene), there is very little change in the size of domains; above 100 °C a drastic change in morphology is observed. Not only is there rapid coarsening of both the constituent phases of the polymer above 100 °C, but also an intermixing of both phase components of the block copolymer. It was demonstrated that some monomeric materials are effective in maintaining the original morphology of the film; i. e. phase mixing is prevented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410634
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology-shrinkage relationships in semi-crystalline polymers. Epitaxy, a way of eliminating amorphous contribution (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 128-133 
    Details
    ISSN: 1435-1536
    Keywords: Morphology-shrinkage relationship ; epitaxy ; PP/PE blends andlaminates ; electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new approach for achieving a highly dimensionally stable film of semi-crystalline polymers via blending is demonstrated. To illustrate this approach, a model system, polyethylene-polypropylene is investigated using TEM, TMA, DSC, and DMA. It is shown that epitaxial growth in polymer blends and laminates can induce a cross-hatch morphology which eliminates or reduces the contribution of an oriented amorphous phase. This ultimately leads to greater dimensional stability and synergism in mechanical properties as well. The presence of an appropriate low-melting component can also be used to reduce shrinkage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652178
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