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Videos de Conceptos Relacionados

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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Video Experimental Relacionado

Updated: Jul 12, 2026

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
10:40

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

Los polímeros ferroeléctricos son polímeros hechos de hierro y electricidad.

A J Lovinger

    Science (New York, N.Y.)
    |June 10, 1983
    PubMed
    Resumen

    Ciertos polímeros, como el poli (fluoruro de vinilideno), exhiben propiedades piezoeléctricas, piroeléctricas y ferroeléctricas. Este estudio detalla los requisitos estructurales para estos comportamientos en polímeros y sus aplicaciones.

    Área de la Ciencia:

    • Ciencia de los materiales Ciencia de los materiales.
    • La ciencia de los polímeros es la ciencia de los polímeros.
    • Física del estado sólido Física del estado sólido

    Sus antecedentes:

    • La piezoelectricidad y la piroelectricidad son fenómenos típicamente observados en cristales inorgánicos y cerámica.
    • Investigaciones recientes han identificado estas propiedades en varios polímeros, ampliando sus aplicaciones potenciales.

    Objetivo del estudio:

    • Investigar los requisitos estructurales moleculares y supermoleculares para el comportamiento ferroeléctrico en polímeros.
    • Proporcionar un análisis detallado centrado en el poli (fluoruro de vinilideno) y sus copolímeros.
    • Revisar las propiedades piezoeléctricas, piroeléctricas y ferroeléctricas de estos polímeros.

    Principales métodos:

    • Análisis estructural detallado de polímeros que exhiben propiedades piezoeléctricas, piroeléctricas y ferroeléctricas.

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  • Revisión de la literatura existente sobre la ferroelectricidad de polímeros.
  • Examen de poli (fluoruro de vinil) y sus copolímeros.

    • Principales resultados:

    • El comportamiento ferroeléctrico ha sido documentado en el poli (fluoruro de vinilideno) y sus copolímeros.
    • Las estructuras moleculares y supermoleculares específicas son cruciales para lograr la ferroelectricidad en los polímeros.
    • Estos polímeros demuestran características piezoeléctricas y piroeléctricas significativas.

    Conclusiones:

    • El poli (fluoruro de vinilideno) y sus copolímeros son materiales prometedores para aplicaciones avanzadas debido a sus propiedades ferroeléctricas, piezoeléctricas y piroeléctricas.
    • Comprender las relaciones estructura-propiedad es clave para desarrollar nuevos polímeros funcionales.
    • Estos polímeros ofrecen una alternativa versátil a los materiales inorgánicos tradicionales en varios campos tecnológicos.