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

Polymers02:34

Polymers

32.8K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
32.8K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

4.0K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
4.0K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.8K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.8K
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
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
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...
2.1K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

1.7K
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...
1.7K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Interferon Receptor Chain Deficiency in Murine Friend Erythroleukemia Cell Clone Resistant to Type I or Type I and II Interferons.

International journal of molecular sciences·2026
Same author

Early-life exposure to 27.5 GHz 5G millimeter-wave radiation induces skin-related biological responses in mice.

Scientific reports·2026
Same author

Fecal miRNome and Proteome Profiling Uncovers Stage-Specific Biomarkers of Alzheimer's Disease in 3×Tg-AD Mice.

Cellular and molecular neurobiology·2026
Same author

Correction to "Liquid Structure with Nano-Heterogeneity Promotes Cationic Transport in Concentrated Electrolytes".

ACS nano·2026
Same author

Rational Design of Weakly-Solvating Molecules for Salt-In-Pre-Ionic-Liquid Electrolytes for Li Metal Batteries.

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

Agarose gelation beyond equilibrium through distributed kinetic pathways and apparent thermodynamic signatures.

Colloids and surfaces. B, Biointerfaces·2026

Video Experimental Relacionado

Updated: May 3, 2026

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
13:42

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

Published on: November 2, 2011

31.3K

Modelos Rouse de dos poblaciones para la dinámica de segmentos de polímeros en nanocompuestos.

Jack R Rooks1, Giovanni Ferraro2,3, Emiliano Fratini2,3

  • 1University of Delaware, Department of Chemical and Biological Engineering, Center for Neutron Science, Newark, Delaware 19716, USA.

Physical review. E
|February 20, 2026
PubMed
Resumen

Se estudió la dinámica de la cadena de polímeros en los nanocompuestos de poli (óxido de etileno) - sílice. La interfaz cerca de las nanopartículas de sílice altera significativamente la dinámica del polímero, lo que explica el refuerzo del material.

Más Videos Relacionados

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

7.6K
Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
07:53

Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering

Published on: August 6, 2021

2.0K

Videos de Experimentos Relacionados

Last Updated: May 3, 2026

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
13:42

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

Published on: November 2, 2011

31.3K
Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

7.6K
Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
07:53

Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering

Published on: August 6, 2021

2.0K

Área de la Ciencia:

  • La ciencia de los polímeros es la ciencia de los polímeros.
  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los nanocompuestos poliméricos (PNC) exhiben propiedades mejoradas debido a las interacciones de nanopartículas.
  • Comprender la dinámica del polímero en la interfaz de las nanopartículas es crucial para el diseño de materiales.

Objetivo del estudio:

  • Investigar la dinámica segmentaria de las cadenas de poli (óxido de etileno) cerca de las nanopartículas de sílice.
  • Modela la dinámica del polímero para explicar el refuerzo en PNCs.

Principales métodos:

  • Se empleó la dispersión de neutrones cuasielástica (QENS) para sondear la dinámica de los polímeros.
  • El modelo de Rouse y un modelo de Rouse suprimido se utilizaron para el análisis de datos.

Principales resultados:

  • La dinámica del polímero cerca de la superficie de sílice difiere del comportamiento de la masa.
  • Un modelo de dos poblaciones, incluido un modelo de Rouse suprimido, describe con precisión la dinámica interfacial.
  • Se cuantificaron las restricciones topológicas, con un grosor de interfaz comparable a la distancia de extremo a extremo del polímero.

Conclusiones:

  • La capa interfacial tiene un impacto significativo en la dinámica de la cadena de polímeros.
  • El refuerzo observado en PNCs a bajas cargas de nanopartículas se atribuye a los efectos de interfase.