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

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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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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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...
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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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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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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Structural optimization of interpenetrated pillared-layer coordination polymers for ethylene/ethane separation.

Keisuke Kishida1, Satoshi Horike, Yoshihiro Watanabe

  • 1Institute for Advanced and Core Technology, Showa Denko K. K. 2 Oaza Nakanosu, Oita 870-0189 (Japan).

Chemistry, an Asian Journal
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel porous coordination polymer for efficient ethylene/ethane separation. Compound 4 demonstrated selective ethylene sorption and good regeneration, outperforming conventional materials.

Keywords:
adsorptionguest-responsive materialsmetal-organic frameworksmicroporous materialsseparation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Effective separation of ethylene from ethane is crucial for the petrochemical industry.
  • Porous coordination polymers (PCPs) offer tunable structures for gas adsorption applications.
  • Double interpenetration in PCPs can influence pore size and gas selectivity.

Purpose of the Study:

  • To synthesize and evaluate four pillared-layer-type porous coordination polymers for ethylene/ethane separation.
  • To investigate the gas sorption properties and selectivity of these novel materials.
  • To assess the regeneration ability of the most promising candidate.

Main Methods:

  • Synthesis of four double interpenetration pillared-layer PCPs: [Zn2(tp)2(bpy)]n (1), [Zn2(fm)2(bpe)]n (2), [Zn2(fm)2(bpa)]n (3), and [Zn2(fm)2(bpy)]n (4).
  • Gas sorption property evaluation, focusing on ethylene and ethane.
  • Breakthrough experiments to determine ethylene/ethane selectivity at 298 K.
  • Assessment of material regeneration capability.

Main Results:

  • Compound 4, possessing the narrowest pores among the studied PCPs, exhibited selective ethylene sorption.
  • Ethylene selectivity for compound 4 was determined to be 4.6 at 298 K via breakthrough experiments.
  • Compound 4 demonstrated superior regeneration ability compared to conventional porous materials.

Conclusions:

  • Porous coordination polymer 4 is a promising material for selective ethylene/ethane separation.
  • The narrow pore structure of compound 4 is key to its ethylene-selective sorption.
  • The material's good regeneration ability enhances its potential for industrial applications.