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Exploring Long-Range Surface-Induced Mobility Enhancement in Poly(methyl methacrylate).

Haoran Nie1, Xiwen Chen1,2, Zongyi Ma1

  • 1Department of Physics, Hong Kong University of Science and Technology, 999077 Hong Kong, China.

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|March 2, 2026
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Summary
This summary is machine-generated.

Investigating poly(methyl methacrylate) (PMMA) films revealed enhanced molecular mobility near the surface. Simulations suggest collective motion in polymers drives this long-range mobility, differing between PMMA and polystyrene (PS).

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Science

Background:

  • Near-surface molecular mobility significantly influences polymer film properties.
  • Understanding surface-induced dynamics is crucial for designing advanced polymer materials.

Purpose of the Study:

  • To investigate the mechanical relaxation and molecular mobility of poly(methyl methacrylate) (PMMA) films.
  • To compare the surface dynamics of PMMA with polystyrene (PS) films.
  • To elucidate the mechanisms behind enhanced near-surface molecular mobility in polymers.

Main Methods:

  • Dynamic mechanical analysis (DMA) was employed to study freestanding PMMA films and PMMA supported by polydimethylsiloxane (PDMS).
  • Coarse-grained molecular dynamics simulations were performed for PMMA and PS.

Main Results:

  • Two tiers of enhanced molecular mobility were observed in PMMA near the surface: a nanoscale outer region and a thicker underlying region (h_t ~ 140 nm).
  • Simulations indicated that fast-moving surface molecules activate adjacent molecules, promoting collective motion in both PMMA and PS.
  • The dynamic enhancement in PMMA terminated at a distance consistent with experimental findings, while in PS, it persisted up to the simulated thickness (250 nm).

Conclusions:

  • Near-surface collective motions play a key role in driving long-range mobility enhancement in polymer films.
  • Polystyrene (PS) exhibits greater near-surface dynamic enhancement compared to poly(methyl methacrylate) (PMMA), explaining the observed differences in h_t.
  • The findings highlight the importance of polymer structure and intermolecular interactions in surface-driven dynamics.