Direct Molar Mass Determination of Self-Assembled Amphiphilic Block Copolymer Nanoobjects Using Electrospray-Charge...

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Analytical Chemistry

Background:

• Amphiphilic block copolymers self-assemble into nanoobjects.
• Accurate molar mass determination of these nanoobjects is crucial for understanding their properties.
• Previous methods for mass determination of such large structures can be indirect or lack precision.

Purpose of the Study:

• To directly determine the molar mass of self-assembled amphiphilic block copolymer nanoobjects.
• To establish a reliable method for mass distribution analysis of nanoparticle assemblies.
• To demonstrate the capability of charge detection mass spectrometry for macromolecular assemblies.

Main Methods:

• Living radical emulsion polymerization was used to synthesize amphiphilic block copolymers.
• Self-assembly of block copolymers into nanoobjects was achieved.
• Charge detection mass spectrometry (CD-MS) coupled with electrospray ionization was employed for mass analysis.

Main Results:

• CD-MS directly measured the molar mass of the self-assembled nanoobjects.
• Statistically significant mass measurements were obtained for particles in the megadalton to gigadalton range.
• The resulting mass distribution of the nanoobjects was successfully calculated.

Conclusions:

• Charge detection mass spectrometry is a powerful tool for direct molar mass determination of self-assembled polymer nanoobjects.
• This method enables accurate analysis of mass distributions for large macromolecular assemblies.
• The findings open new avenues for characterizing complex polymeric nanostructures.