Laser-induced nanometer expansion and contraction dynamics of polystyrene films depending on its molecular weight

Takashi Mito, Hiroshi Masuhara*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

13 Scopus citations

Abstract

We have measured surface morphological changes of polystyrene films using nanosecond time-resolved interferometry. In the case of low molecular weights (3.0 × 10 3 and 5.0 × 10 3 ), the surface contracts exponentially. In the case of high molecular weight (1.0 × 10 6 ), however, two different contraction processes are observed, that is, a major contraction and a minor tail. The thermal diffusion coefficients of major components acquired experimentally from both high and low molecular weights are almost the same as the value in the literature, which indicates thermal diffusion is dominant for a major contraction. On the other hand, we consider the minor tail from the viewpoints of rubber-glass transition and polymer entanglements.

Original languageEnglish
Pages (from-to)796-799
Number of pages4
JournalApplied Surface Science
Volume197-198
DOIs
StatePublished - 1 Jan 2002
EventCola 2001 - Tsukuba, Japan
Duration: 1 Oct 20011 Oct 2001

Keywords

  • Interferometry
  • Laser ablation
  • Nanosecond expansion
  • Polystyrene
  • Tens of microsecond contraction

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