Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.6K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.4K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.4K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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...
2.3K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.1K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
8.1K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.3K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.3K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.8K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Driver wavelength and intensity dependence of extreme ultraviolet emission from laser-produced tin microdroplet plasmas.

Optics express·2026
Same author

Elemental Selenium/Tellurium in Polymer Assemblies: Responsive Innovation.

Polymer science & technology (Washington, D.C.)·2026
Same author

Dynamic Covalent Se─Se Bonds Enable Mechanically Adaptive Selenium Crystals.

Angewandte Chemie (International ed. in English)·2026
Same author

Polymer Shape Morphing Based on Dynamic Chemistries.

ACS applied materials & interfaces·2026
Same author

Recyclable thermoplastic silicone elastomers from non-carbon heteroatomic polymer backbones.

Nature communications·2026
Same author

Biomimetic Polymerization of Tellurocysteine: Breaking the Natural Amino Acid Radioprotection Limitation.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same journal

Amorphous High-Entropy Oxides With High-Valent Metal and Oxygen-Vacancy Pairs for Thermally Stable Catalytic Oxidation.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

H<sub>2</sub>S Self-Supplied Micelles Reverse Tumor-Immune Effector Cells Energy Metabolisms to Boost Breast Cancer Immunotherapy With Microenvironment Normalization.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

Feed-Draw Printing Enables Monolithically Integrated Flexible Sensors With High Interfacial Toughness and Wide Linear Range.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

Space-Time Coding Conformal Metasurfaces for Multifrequency Beam Steering and Shaping.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

3D Printing of Magnetic Soft Materials for Functional Structures and Devices.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

Photothermal-Activable Artificial Macrophage With Amplified Systemic Antibacterial Responses to Combat Primary and Secondary Infection.

Advanced materials (Deerfield Beach, Fla.)·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Sep 9, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

9.6K

Lograr la evolución mecánica en los materiales poliméricos a través de la evolución de la fase inducida por la luz

Cheng Liu1, Chaowei He1, Xiaobin Dai2

  • 1Key Lab of Organic Optoelectronic & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.

Advanced materials (Deerfield Beach, Fla.)
|September 3, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo método para crear materiales poliméricos "en evolución" que mejoran dinámicamente sus propiedades mecánicas con el tiempo. Este avance permite un control sin precedentes sobre el rendimiento del material, imitando la evolución biológica en sistemas artificiales.

Palabras clave:
Polimerización in situEvolución mecánicaEvolución de las fasesRadicales de selenoRespuesta a la luz visible

Más Videos Relacionados

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
06:16

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Published on: December 21, 2017

5.8K
Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
06:49

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

11.9K

Videos de Experimentos Relacionados

Last Updated: Sep 9, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

9.6K
Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
06:16

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Published on: December 21, 2017

5.8K
Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
06:49

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

11.9K

Área de la Ciencia:

  • Ciencias de los materiales
  • Química de los polímeros
  • Ingeniería mecánica

Sus antecedentes:

  • Los materiales poliméricos artificiales son típicamente estáticos y carecen de las características dinámicas y evolutivas de los tejidos biológicos.
  • El diseño de polímeros con propiedades temporalmente mejoradas sigue siendo un desafío importante en la ciencia de los materiales.

Objetivo del estudio:

  • Proponer y demostrar una estrategia para crear materiales poliméricos que exhiban una transformación temporal continua y una mejora de las propiedades mecánicas.
  • Investigar un método para lograr la "evolución mecánica" en los sistemas de polímeros artificiales.

Principales métodos:

  • Se desarrolló una estrategia para diseñar materiales poliméricos con fases y propiedades mecánicas temporalmente transformables.
  • Se utilizó la polimerización in situ iniciada por luz visible para controlar una secuencia de transiciones de fase (generación, separación, fusión).
  • El enfoque se aplicó a un sistema de hidrogel para cuantificar los cambios en las propiedades mecánicas.

Principales resultados:

  • Las fases del polímero sufrieron transiciones secuenciales, lo que condujo a mejoras distintas y significativas en las propiedades mecánicas a lo largo del tiempo.
  • Se logró un aumento récord en el módulo de Young de más de 2400 veces en un sistema de hidrogel (de 18,5 kPa a 44,5 MPa).
  • La evolución temporal de las propiedades mecánicas fue controlada con precisión utilizando luz visible.

Conclusiones:

  • La estrategia propuesta permite el diseño de materiales poliméricos artificiales con propiedades mecánicas temporalmente mejoradas, similares a la evolución biológica.
  • Este trabajo abre caminos para adaptar las propiedades de los materiales a la demanda y construir metamateriales avanzados con módulos sintonizables y de varios niveles y arquitecturas complejas.