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Related Concept Videos

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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.
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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: 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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Updated: Jun 26, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Melt memory in random ethylene-1-alkene copolymers.

Yunxiang Shi1, Jingqing Li1, Hongfei Li2

  • 1School of Materials Science and Engineering, Tianjin University, Tianjin 300072, P. R. China. scjiang@tju.edu.cn.

Soft Matter
|May 17, 2024
PubMed
Summary
This summary is machine-generated.

Chain stiffness in ethylene-1-alkene copolymers affects polymer dynamics. Increased 1-alkene content enhances melt memory, aiding polyolefin processing and understanding polymer chain behavior.

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Polymer chain conformation, influenced by flexibility or stiffness, is critical for polymer dynamics and kinetics.
  • Hierarchical chain architecture significantly impacts polymer properties and behavior.

Purpose of the Study:

  • To synthesize random copolymers of ethylene and 1-alkenes (1-hexene, 1-octene, 1-dodecene) using metallocene catalysts.
  • To investigate the crystallization behavior and melt memory effect in these copolymers with varying side groups.
  • To understand the dynamical behavior of the copolymers through rheological tests.

Main Methods:

  • Synthesis of random ethylene-1-alkene copolymers using metallocene catalysts.
  • Differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) for crystallization analysis.
  • Rheological tests to evaluate polymer dynamics and viscosity.

Main Results:

  • Melting peak and viscosity decreased, while orthorhombic crystal dimensions increased with higher co-unit content.
  • A scaling relationship of 3.6 between zero shear viscosity and molecular weight was observed for ethylene-1-hexene and ethylene-1-octene copolymers.
  • Melt memory effect was enhanced by increasing 1-alkene content, independent of the specific 1-alkene type.

Conclusions:

  • The 1-alkene side groups influence polymer chain dynamics, leading to an enhanced melt memory effect.
  • Findings provide insights into chain stiffness-driven polymer dynamics and processing of metallocene-catalyzed polyolefins and copolymers.