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Related Concept Videos

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...
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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,...
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pH-Switchable ampholytic supramolecular copolymers.

Hendrik Frisch1, Jan Patrick Unsleber, David Lüdeker

  • 1Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Münster (Germany) http://www.besenius-group.com; CeNTech, Münster (Germany).

Angewandte Chemie (International Ed. in English)
|August 10, 2013
PubMed
Summary
This summary is machine-generated.

Anionic and cationic peptide amphiphiles self-assemble into supramolecular copolymers. These responsive materials enable on-off polymerization triggered by pH changes, offering controlled material formation.

Keywords:
cooperativitycopolymerizationpH switchself-assemblystimuli-responsive behavior

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Area of Science:

  • Supramolecular chemistry
  • Polymer science
  • Materials science

Background:

  • Peptide amphiphiles are versatile building blocks for self-assembly.
  • Controlling self-assembly and polymerization is crucial for advanced materials.
  • pH-responsive systems offer tunable properties for various applications.

Purpose of the Study:

  • To design and synthesize anionic and cationic dendritic peptide amphiphiles.
  • To investigate their self-assembly into supramolecular copolymers.
  • To demonstrate pH-triggered on-off polymerization of these ampholytic materials.

Main Methods:

  • Synthesis of anionic and cationic dendritic peptide amphiphiles.
  • Characterization of self-assembly using techniques like spectroscopy and microscopy.
  • Investigation of polymerization behavior in response to varying pH conditions.

Main Results:

  • Anionic and cationic dendritic peptide amphiphiles self-assemble into supramolecular copolymers at a 1:1 feed ratio.
  • The self-assembly and subsequent polymerization are initiated at a physiologically relevant pH.
  • The polymerization process can be reversibly switched off by altering the pH away from the optimal value.

Conclusions:

  • Developed ampholytic supramolecular copolymers with pH-responsive polymerization.
  • Demonstrated precise control over material formation using external pH triggers.
  • These materials hold potential for applications requiring tunable and switchable properties.