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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.
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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.
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P-Type Low-Molecular-Weight Hydrogelators.

Emily R Draper1, Bart Dietrich1, Christopher Brasnett2

  • 1School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.

Macromolecular Rapid Communications
|January 16, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed new p-type gelators for optoelectronics. These amino-acid-functionalized molecules can form organized structures from water, useful for solar cell applications.

Keywords:
hydrogelsoligo phenylene vinylenesself-assemblyterthiophenestetrathiafulvalenes

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Supramolecular Chemistry

Background:

  • Low-molecular-weight gelators (LMWGs) are increasingly used in optoelectronic and solar cell systems.
  • There is a limited availability of p-type gelators suitable for these advanced applications.

Purpose of the Study:

  • To synthesize and characterize novel amino-acid-functionalized p-type gelators.
  • To explore their potential in optoelectronic and solar cell technologies.

Main Methods:

  • Synthesis of three novel gelators incorporating terthiophene, tetrathiafulvalene, and oligo(phenylenevinylene) cores.
  • Characterization of their gelation properties in water.
  • Fabrication and analysis of thin films derived from these gels.

Main Results:

  • The designed molecules successfully gelled water, forming highly organized structures.
  • Dried thin films exhibited significant p-type semiconducting behavior.
  • The molecular cores are known electron donors, suggesting suitability for optoelectronic devices.

Conclusions:

  • The new amino-acid-functionalized gelators offer promising p-type semiconductor properties.
  • These materials can form ordered structures ideal for thin-film applications in optoelectronics and solar cells.
  • This work expands the library of functional p-type gelators for advanced material applications.