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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
Types of Step-Growth Polymers: Polyesters01:20

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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 polymer...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Precision sulfonic Acid ester copolymers.

Kathleen L Opper1, Kenneth B Wagener

  • 1The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.

Macromolecular Rapid Communications
|June 28, 2011
PubMed
Summary
This summary is machine-generated.

Synthesized linear ethylene copolymers with precisely spaced sulfonic acid esters exhibit tailored morphologies. Direct attachment yields crystalline structures, while aromatic spacing results in amorphous behavior, impacting material properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Conventional ionic polyolefins often exhibit clustered ionic structures.
  • Tailoring polymer morphology is crucial for advanced material applications.

Purpose of the Study:

  • To synthesize linear ethylene copolymers with precisely spaced sulfonic acid ethyl esters.
  • To investigate the influence of ester spacing on polymer higher-order morphology and thermal properties.

Main Methods:

  • Metathesis polycondensation chemistry was employed for precise polymer synthesis.
  • Primary structural characterization confirmed the synthesized polymer structures.
  • Differential Scanning Calorimetry (DSC) was used for microstructural analysis.

Main Results:

  • Precisely spaced sulfonic acid ethyl esters were successfully incorporated into linear ethylene copolymers.
  • Polymers with directly attached esters showed polyethylene-like lamellar crystallites with recoverable melt transitions.
  • Polymers with aromatic-spaced esters exhibited completely amorphous behavior.

Conclusions:

  • The precise placement and spacing of sulfonic acid ester groups significantly influence the morphology of ethylene copolymers.
  • Direct attachment promotes crystallinity, while aromatic spacing leads to amorphous structures.
  • These findings offer a pathway to design tailored polymer morphologies for specific applications.