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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
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...
1.9K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
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...
2.1K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
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Related Experiment Video

Updated: Jun 22, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

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Hyperbranched, Functional Polyethoxysiloxanes: Tunable Molecular Building Blocks.

Marek Nemec1,2, Stefanie B Hauser1, Daniel Rentsch3

  • 1Laboratory of Building Energy Materials & Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.

ACS Applied Polymer Materials
|July 4, 2024
PubMed
Summary
This summary is machine-generated.

We developed versatile organofunctional polyethoxysilanes (funPEOS) using a one-pot method. These stable liquid silanes offer tunable properties for applications like scratch-resistant coatings and silica foams.

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

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Nanosponge Tunability in Size and Crosslinking Density
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Nanosponge Tunability in Size and Crosslinking Density

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Related Experiment Videos

Last Updated: Jun 22, 2025

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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Nanosponge Tunability in Size and Crosslinking Density
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Nanosponge Tunability in Size and Crosslinking Density

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Chemistry

Background:

  • Functional silanes are essential for modifying material properties.
  • Existing methods may lack versatility in molecular weight and functional group control.

Purpose of the Study:

  • To synthesize versatile organofunctional polysiloxane building blocks.
  • To enable tailored molecular weight, condensation, and organic substituent loading.

Main Methods:

  • A one-pot, two-step synthesis involving PEOS carrier formation and functional silane grafting.
  • Optimization from lab scale to a 7 L reactor.
  • Characterization using 29Si NMR, 2D INADEQUATE NMR, IR, 1H, and 13C NMR.

Main Results:

  • Successful synthesis of organofunctional polyethoxysilanes (funPEOS) with tunable molar masses (3500-20,000 g/mol).
  • Confirmation of hyperbranched carrier structure and successful grafting of functional silanes.
  • Demonstration of intact functional groups and stable organic liquid properties.

Conclusions:

  • The developed funPEOS offer significant versatility for material design.
  • Applications include scratch-resistant coatings, stable emulsions, and mesoporous silica foams.