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Absolute local conformation of poly(methyl methacrylate) chains adsorbed on a quartz surface. | LitMetric

AI Article Synopsis

  • - Polymer chains at interfaces with inorganic solids significantly impact how polymer nanocomposites and adhesives perform, making their study important.
  • - Conventional SFG vibrational spectroscopy struggles to accurately determine the orientation of functional groups because it loses phase information, but phase-sensitive SFG (ps-SFG) addresses this issue effectively.
  • - Using ps-SFG on PMMA chains in contact with quartz revealed that the ester methyl groups were oriented toward the quartz surface, enhancing our understanding of the chains' local conformation and the factors influencing it.

Article Abstract

Polymer chains at a buried interface with an inorganic solid play a critical role in the performance of polymer nanocomposites and adhesives. Sum frequency generation (SFG) vibrational spectroscopy with a sub-nanometer depth resolution provides valuable information regarding the orientation angle of functional groups at interfaces. However, in the case of conventional SFG, since the signal intensity is proportional to the square of the second-order nonlinear optical susceptibility and thereby loses phase information, it cannot be unambiguously determined whether the functional groups face upward or downward. This problem can be solved by phase-sensitive SFG (ps-SFG). We here applied ps-SFG to poly(methyl methacrylate) (PMMA) chains in direct contact with a quartz surface, shedding light on the local conformation of chains adsorbed onto the solid surface. The measurements made it possible to determine the absolute orientation of the ester methyl groups of PMMA, which were oriented toward the quartz interface. Combining ps-SFG with all-atomistic molecular dynamics simulation, the distribution of the local conformation and the driving force are also discussed.

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Source
http://dx.doi.org/10.1063/5.0184315DOI Listing

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