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Related Concept Videos

Organic Compounds03:02

Organic Compounds

51.4K
All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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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
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.0K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.0K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.4K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.4K
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.9K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
2.9K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
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

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Organic Molecular Weaves.

Andreas Herdlitschka1, Bartosz Lewandowski1, Helma Wennemers2

  • 1Laboratorium für Organische Chemie, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, CH-8093 Zürich.

Chimia
|March 29, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explore molecular weaving of organic compounds to create strong, elastic materials. This review details strategies for forming interwoven networks, paving the way for advanced nanostructured materials with superior mechanical properties.

Keywords:
Molecular weavesNanostructured materialsSupramolecular chemistryTopologies

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Molecular weaving presents a significant challenge in materials science.
  • Creating interwoven networks of organic compounds with controlled crossing points is complex.
  • Few examples of entirely organic molecular weaves have been achieved.

Purpose of the Study:

  • To review strategies for forming organic molecular weaves.
  • To highlight the structural characteristics of resulting nanostructured materials.
  • To forecast future developments in organic molecular weaving.

Main Methods:

  • Review of existing literature on organic molecular weaving.
  • Analysis of different synthetic strategies employed.
  • Characterization of structural features of reported organic weaves.

Main Results:

  • Several strategies have been identified for achieving molecular weaving of organic compounds.
  • The structural features of these nanostructured materials have been elucidated.
  • The formation of defined and regular crossing points remains a key challenge.

Conclusions:

  • Pioneering studies demonstrate the feasibility of organic molecular weaving.
  • Further research is expected to yield more complex topologies and enhanced mechanical properties.
  • Organic molecular weaves hold promise for advanced materials with high elasticity, strength, and toughness.