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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Parallel Catalyst Synthesis Protocol for Accelerating Heterogeneous Olefin Polymerization Research.

Patchanee Chammingkwan1, Mostafa Khoshsefat1, Minoru Terano1

  • 1Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi 923-1292, Japan.

Polymers
|December 23, 2023
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Summary

Researchers developed a 12-parallel reactor system for efficient Ziegler-Natta catalyst synthesis. This accelerates data generation for understanding catalyst performance in olefin polymerization.

Keywords:
Ziegler-Natta catalystminiaturemorphologyolefin polymerizationparallel synthesis

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Area of Science:

  • Catalysis
  • Polymer Chemistry
  • Materials Science

Background:

  • Data-driven approaches are crucial for understanding complex systems, particularly in catalysis.
  • Ziegler-Natta catalyst synthesis for olefin polymerization is traditionally slow and data-limited.
  • Developing high-throughput methods is essential for advancing heterogeneous catalysis research.

Purpose of the Study:

  • To develop a parallel synthesis system for Ziegler-Natta catalysts.
  • To establish a protocol for rapid generation of diverse catalyst libraries.
  • To facilitate data-driven structure-performance relationship studies in olefin polymerization.

Main Methods:

  • A custom-designed 12-parallel reactor system with miniature, magnetically stirred vessels was engineered.
  • A streamlined catalyst synthesis protocol was established for parallel execution.
  • The system was validated for consistency and reliability across reduced synthetic scales.

Main Results:

  • The parallel reactor system enabled a tenfold reduction in synthetic scale.
  • The protocol proved highly efficient for generating a catalyst library with varied compositions and physical properties.
  • Consistent and reliable catalyst synthesis was achieved across all parallel reactors.

Conclusions:

  • The developed system and protocol overcome bottlenecks in Ziegler-Natta catalyst synthesis and data generation.
  • This high-throughput approach provides a foundation for data-driven discovery of structure-performance relationships.
  • The methodology holds significant promise for accelerating innovation in heterogeneous olefin polymerization catalysis.