High-rate crystallization of polycarbonate in spincast thin film

Seisuke Ata, Toshitaka Oka, Chun Qing He, Toshiyuki Ohdaira, Ryouichi Suzuki, Kenji Ito, Yoshinori Kobayashi, Toshiaki Ougizawa

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Surface morphology of bisphenol-A polycarbonate (BAPC) thin films, with thickness ranging from 30 to 1000 nm on silicon substrates was studied by atomic force microscopy. The films were prepared by spincasting from 1,2-dichloroethane solutions of 0.25-5.0 wt % BAPC. Even though longer annealing than 250 h was necessary for complete crystallization for bulk BAPC, high crystallinity was observed for 30 nm thick film after annealing at 200 °C for 48 h in vacuum. Positron annihilation lifetime spectroscopy measurements showed that the free volume hole size in 30 nm thick film was larger than that of bulk at 200 °C. Comparison of the BAPC concentration in the precursor solution with the overlap concentration suggests that the high crystallinity of the 30 nm BAPC film is due to less entangled chains caused by rapid removal of the solvent from the dilute solution.

Original languageEnglish
Pages (from-to)2148-2153
Number of pages6
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume48
Issue number20
DOIs
Publication statusPublished - 2010 Oct 4
Externally publishedYes

Keywords

  • Crystallization
  • Entanglement
  • Polycarbonates
  • Spincast
  • Thin film

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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