Nanomechanical measurements in ultrathin polymer films

Paul A. O'Connell, Gregory B. McKenna

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Using a nano-bubble inflation technique developed in our lab we have measured the absolute creep compliance of polymer films down to a thickness of 9nm [1-3]. Materials studied were a poly (vinyl acetate) (PVAc), a polystyrene (PS) and a polycarbonate (PC). All three materials showed dramatic stiffening of the rubbery plateau compliance as the thickness was reduced below approximately 100nm, with the stiffness increasing by some three orders of magnitude for the thinnest films. In the region where the stiffness is thickness dependent, the stiffness of all three materials varies as approximately the inverse of the square of the thickness. Interestingly, while the change in stiffness was common to all materials, the reduction in the glass transition temperature which is commonly observed in thin free standing films was very different. The PS showed a decrease of approximately 50K at a thickness of 11nm which is comparable to literature data. The PVAc showed no change in Tg down to 23nm while the PC showed a large decrease of ∼90K at 9nm.

Original languageEnglish
Title of host publication68th Annual Technical Conference of the Society of Plastics Engineers 2010, ANTEC 2010
Pages1958-1961
Number of pages4
StatePublished - 2010
Event68th Annual Technical Conference of the Society of Plastics Engineers 2010, ANTEC 2010 - Orlando, FL, United States
Duration: May 16 2010May 20 2010

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings
Volume3

Conference

Conference68th Annual Technical Conference of the Society of Plastics Engineers 2010, ANTEC 2010
CountryUnited States
CityOrlando, FL
Period05/16/1005/20/10

Keywords

  • Membrane inflation
  • Nanobubble inflation
  • Polymer
  • Thin film
  • Viscoelasticity

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