Related Experiment Videos
Fast magic-angle spinning proton NMR studies of polymers at surfaces and interfaces
P A Mirau1, S A Heffner, M Schilling
1Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974-0636, USA. mirau@bell-labs.com
Solid State Nuclear Magnetic Resonance
|May 16, 2000
Summary
Solid-state proton NMR reveals polymer and water distribution in porous glass composites. The study shows polymers occupy the pore center, with water and hydroxyl groups at the surface.
Area of Science:
- Materials Science
- Polymer Chemistry
- Analytical Chemistry
Background:
- Porous materials are crucial in various applications, requiring detailed understanding of their internal structure.
- Characterizing the interface between polymers, water, and solid matrices is essential for composite material design.
Purpose of the Study:
- To investigate the structure and dynamics of polymers and water within porous glass composites.
- To determine the precise distribution of polymer and water within the nanopores.
Main Methods:
- Solid-state proton Nuclear Magnetic Resonance (NMR) spectroscopy with fast magic-angle sample spinning (15 kHz).
- Advanced NMR techniques including 1H-29Si 2D heteronuclear correlation and wideline separation NMR.
- Preparation of porous glass composites via photopolymerization of acrylate formulations.
Main Results:
- High-resolution solid-state proton NMR spectra were obtained above the polymer glass transition temperature.
- Sensitive detection allowed for accurate determination of polymer and water composition within the pores.
- NMR studies indicated polymer filling the central 30 Å of the 40 Å pores.
Conclusions:
- The polymer primarily occupies the core of the nanopores.
- The remaining pore volume is occupied by surface hydroxyl groups and water.
- Solid-state NMR is a powerful tool for elucidating complex composite structures at the nanoscale.