Coupled effects of substrate adhesion and intermolecular forces on polymer thin film glass-transition behavior

Wenjie Xia, Sinan Keten*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Intermolecular noncovalent forces between polymer chains influence the mobility and glass-transition temperature (Tg), where weaker interchain interactions, all else being the same, typically results in lower bulk polymer Tg. Using molecular dynamics simulations, here we show that this relation can become invalid for supported ultrathin films when the substrate-polymer interaction is extremely strong and the polymer-polymer interactions are much weaker. This contrasting trend is found to be due to a more pronounced substrate-induced appreciation of the film Tg for polymers with weaker intermolecular interactions and low bulk Tg. We show that optimizing this coupling between substrate adhesion and bulk T g maximizes thin film Tg, paving the way for tuning film properties through interface nanoengineering.

Original languageEnglish (US)
Pages (from-to)12730-12736
Number of pages7
JournalLangmuir
Volume29
Issue number41
DOIs
StatePublished - Oct 15 2013

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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