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  2. Polymer characterization - Wikipedia

    en.wikipedia.org/wiki/Polymer_characterization

    Polymer morphology is a microscale property that is largely dictated by the amorphous or crystalline portions of the polymer chains and their influence on each other. Microscopy techniques are especially useful in determining these microscale properties, as the domains created by the polymer morphology are large enough to be viewed using modern ...

  3. Polyamorphism - Wikipedia

    en.wikipedia.org/wiki/Polyamorphism

    Polyamorphism is the ability of a substance to exist in several different amorphous modifications. It is analogous to the polymorphism of crystalline materials. Many amorphous substances can exist with different amorphous characteristics (e.g. polymers).

  4. Hoffman nucleation theory - Wikipedia

    en.wikipedia.org/wiki/Hoffman_Nucleation_Theory

    Amorphous regions lack the energy needed to order into folded regions such as those seen in the Crystalline state. Polymers contain different morphologies on the molecular level which give rise to their macro properties. Long range disorder in the polymer chain is representative of amorphous solids, and the chain segments are considered amorphous.

  5. Polymer - Wikipedia

    en.wikipedia.org/wiki/Polymer

    Polymer degradation is a change in the properties—tensile strength, color, shape, or molecular weight—of a polymer or polymer-based product under the influence of one or more environmental factors, such as heat, light, and the presence of certain chemicals, oxygen, and enzymes.

  6. Crystallization of polymers - Wikipedia

    en.wikipedia.org/wiki/Crystallization_of_polymers

    The density of such boundaries is lower in polymers with very low crystallinity (amorphous polymer) or very high degree of crystalline polymers, consequentially, the transparency is higher. [5] For example, atactic polypropylene is usually amorphous and transparent while syndiotactic polypropylene, which has crystallinity ~50%, is opaque. [ 30 ]

  7. Tacticity - Wikipedia

    en.wikipedia.org/wiki/Tacticity

    [1] [better source needed] The practical significance of tacticity rests on the effects on the physical properties of the polymer. [not verified in body] The regularity of the macromolecular structure influences the degree to which it has rigid, crystalline long range order or flexible, amorphous long range disorder.

  8. Spherulite (polymer physics) - Wikipedia

    en.wikipedia.org/wiki/Spherulite_(polymer_physics)

    Formation of spherulites affects many properties of the polymer material; in particular, crystallinity, density, tensile strength and Young's modulus of polymers increase during spherulization. This increase is due to the lamellae fraction within the spherulites, where the molecules are more densely packed than in the amorphous phase.

  9. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    The characteristics of polycarbonate compare to those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate is stronger and will hold up longer to extreme temperature. Thermally processed material is usually totally amorphous, [ 7 ] and as a result is highly transparent to visible light , with better light transmission than many kinds ...