Position-Dependent Diffusion Dynamics of Entangled Polymer Melts Nanoconfined by Parallel Immiscible Polymer Films

Kyoung Il Jo, Younghoon Oh, Tae Ho Kim, Joona Bang, Guangcui Yuan, Sushil K. Satija, Bong June Sung, Jaseung Koo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The morphological structure and dynamics of confined polymers adjacent to the polymer-polymer interface have a profound effect on determining the overall physical properties of polymer blends. We measured the diffusion dynamics of poly(methyl methacrylate) (PMMA) melts confined between polystyrene (PS) layers using neutron reflectivity. Combinations of various thicknesses of PMMA and deuterated PMMA (dPMMA) allowed us to experimentally reveal the nonmonotonic behavior of polymer mobility near the PS-PMMA interface. From the neutron reflectivity results, we found that the polymers adjacent to the immiscible polymer-polymer interface showed enhanced diffusion dynamics because of the repulsive interaction between PS and PMMA, whereas the polymer at local regions farther from the interface exhibited reduced dynamics. This is probably due to the nonspherical conformation of PMMA and spatial confinement near the PS-PMMA interface.

Original languageEnglish
Pages (from-to)1483-1488
Number of pages6
JournalACS Macro Letters
Issue number10
Publication statusPublished - 2020 Oct 20

Bibliographical note

Funding Information:
This work was supported by a grant from the National Research Foundation of Korea under Contract 2019R1F1A1059109 and Korea Technology and Information Promotion Agency for SMEs under G21S284165801

Publisher Copyright:

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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