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

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.2K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.7K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.7K
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
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.0K
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...
2.0K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Engineering and Application of a Thermostable MHETase for PET Depolymerization.

ACS sustainable chemistry & engineering·2026
Same author

Lignin to adipic acid in a high-yield chemical and biological redox process.

Nature·2026
Same author

Effects of Polymer Morphology on Solvent and Catalyst Accessibility during Polyethylene and Polystyrene Autoxidation.

JACS Au·2026
Same author

Alkylidene functionalization produces highly recyclable and scalable polyhydroxyalkanoates.

Science (New York, N.Y.)·2026
Same author

Catalytic Autoxidation for Depolymerization of Multilayer Plastic Films.

ChemSusChem·2026
Same author

Production and Evaluation of Fluorophore-Doped Polymer Substrates to Screen for Plastic-Degrading Enzymes.

ACS sustainable chemistry & engineering·2026

Video Experimental Relacionado

Updated: Sep 9, 2025

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
11:33

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion

Published on: September 2, 2016

13.9K

Métodos para el cierre de la masa de carbono en el hidrocraqueo de poliolefina

Anna E Brenner1, Griffin Drake1, Gregg T Beckham2,3

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

JACS Au
|August 29, 2025
PubMed
Resumen

La cuantificación precisa del producto en el hidrocraqueo de poliolefinas es crucial. Los métodos de captura mejorados, como la recolección de flujos, mejoran significativamente el cierre del balance de carbono, lo que permite obtener datos fiables de rendimiento y selectividad para el reciclaje de plástico.

Palabras clave:
Balance de carbonoCromatografía de gasesEl hidrocraqueoDesconstrucción de plásticosPolietileno y sus derivadosZSM-5 (en inglés)

Más Videos Relacionados

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
11:28

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating

Published on: December 25, 2016

26.6K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K

Videos de Experimentos Relacionados

Last Updated: Sep 9, 2025

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
11:33

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion

Published on: September 2, 2016

13.9K
Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
11:28

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating

Published on: December 25, 2016

26.6K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K

Área de la Ciencia:

  • Ingeniería Química
  • Ciencias de los materiales
  • Catálisis

Sus antecedentes:

  • El hidrocraqueo de poliolefina ofrece una vía para la valorización de los residuos plásticos.
  • Los métodos de cuantificación de productos incoherentes dificultan la determinación precisa del rendimiento y la selectividad.
  • Se informan déficits significativos del balance de carbono (más del 50%) debido a la pérdida de productos.

Objetivo del estudio:

  • Identificar las principales fuentes de pérdida de producto en el hidrocraqueo de poliolefinas.
  • Desarrollar y evaluar métodos mejorados de captura de productos para mejorar la precisión de la cuantificación.
  • Proporcionar directrices para la selección de las técnicas de captura óptimas.

Principales métodos:

  • Se evaluaron siete técnicas complementarias para la recuperación de vapor y la retención de la fase líquida.
  • Métodos evaluados basados en el aumento de la volatilidad, el volumen del sistema o la disminución de la volatilidad.
  • Utilizó un enfoque de recolección de flujo con barrido de helio y bolsas de muestreo de gas.

Principales resultados:

  • La recogida de flujo logró la mayor recuperación (96 ± 9,2% de cierre del balance de carbono).
  • La eficacia del método depende de la distribución del producto (gases condensables frente a los ligeros).
  • Adición de disolventes efectiva para productos ricos en condensables; recogida de flujos para productos mixtos.

Conclusiones:

  • Ningún protocolo de captura de producto es universalmente óptimo para el hidrocraqueo de poliolefinas.
  • Las estrategias de trabajo específicas del método son esenciales para un análisis preciso.
  • Las directrices desarrolladas facilitan la captura robusta de productos y la generación de datos fiables.