Anomalous behavior of polystyrene blends using thermally induced surface wrinkling

Jessica M. Torres, Bryan D. Vogt

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The wrinkling of a 50:50 blend of a high molecular mass (M n = 990 kg/mol) and low molecular mass (M n = 1.3 kg/mol) polystyrene (PS) film is studied as a function of annealing temperature and film thickness. Both thermal and mechanical wrinkling are utilized to elucidate the apparent modulus of these PS blend films. The PS blend shows a modulus comparable to the high molecular weight PS, ≈ 3.2 GPa for mechanical wrinkling at ambient and thermal wrinkling for T ≤ 50°C. A sharp decrease in the apparent modulus of the film occurs when thermal wrinkling occurs at 60°C or higher. The calculated modulus in this case is 0.5 GPa, which is significantly below the modulus determined the neat PS for either M n when thermally wrinkled at T > 60°C. This behavior is attributed to a combination of surface segregation of the low molecular weight PS as well as the large difference in bulk glass transition temperature (T g) of each component. During thermal wrinkling, the high M n PS vitrifies first, while the surface containing primarily low M n PS is rubbery; this leads to only the underlayer of PS wrinkling initially and selection of a shorter wavelength due to the effective thickness. The increased thermally induced stresses during cooling when the low M n PS is vitrified do not change the selected wavelength and instead only leads to an increase in the wrinkle amplitude. These results illustrate a potential method to modulate the wrinkle wavelength without changing the overlayer, which could be useful for patterning applications.

Original languageEnglish (US)
Title of host publicationSoft Matter, Biological Materials and Biomedical Materials - Synthesis, Characterization and Applications
Number of pages6
StatePublished - 2011
Event2010 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 29 2010Dec 3 2010

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2010 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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