Assembly and characterization of well-defined high-molecular-weight poly(p -phenylene) polymer brushes

Jose Alonzo, Jihua Chen, Jamie Messman, Xiang Yu, Kunlun Hong, Suxiang Deng, Onome Swader, Mark Dadmun, John F. Ankner, Phillip Britt, Jimmy W. Mays, Massimo Malagoli, Bobby G. Sumpter, Jean-Luc Bredas, S. Michael Kilbey*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The assembly and characterization of well-defined, end-tethered poly(p-phenylene) (PPP) brushes having high molecular weight, low polydispersity and high 1,4-stereoregularity are presented. The PPP brushes are formed using a precursor route that relies on either self-assembly or spin coating of high molecular weight (degrees of polymerizations 54, 146, and 238) end-functionalized poly(1,3-cyclohexadiene) (PCHD) chains from benzene solutions onto silicon or quartz substrates, followed by aromatization of the end-attached PCHD chains on the surface. The approach allows the thickness (grafting density) of the brushes to be easily varied. The dry brushes before and after aromatization are characterized by ellipsometry, atomic force microscopy, grazing angle attenuated total reflectance Fourier transform infrared spectroscopy, and UV-Vis spectroscopy. The properties of the PPP brushes are compared with those of films made using oligo-paraphenylenes and with ab initio density functional theory simulations of optical properties. Our results suggest conversion to fully aromatized, end-tethered PPP polymer brushes having effective conjugation lengths of 5 phenyl units.

Original languageEnglish (US)
Pages (from-to)4367-4374
Number of pages8
JournalChemistry of Materials
Volume23
Issue number19
DOIs
StatePublished - Oct 11 2011

Keywords

  • electronic structure
  • poly(para-phenylene)
  • polymer brush
  • thin film

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this