Assembly and Characterization of Well-Defined High-Molecular-Weight Poly(p-phenylene) Polymer Brushes

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...

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Bibliographic Details
Published in:Chemistry of materials 2011-10, Vol.23 (19), p.4367-4374
Main Authors: Alonzo, Jose, Chen, Jihua, Messman, Jamie, Yu, Xiang, Hong, Kunlun, Deng, Suxiang, Swader, Onome, Dadmun, Mark, Ankner, John F, Britt, Phillip, Mays, Jimmy W, Malagoli, Massimo, Sumpter, Bobby G, Brédas, Jean-Luc, Kilbey, S. Michael
Format: Article
Language:English
Subjects:
AROMATIZATION
ATOMIC FORCE MICROSCOPY
BENZENE
CHAINS
COATINGS
ELECTRONIC STRUCTURE
ELLIPSOMETRY
FUNCTIONALS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATERIALS SCIENCE
MOLECULAR WEIGHT
OPTICAL PROPERTIES
POLYMERS
PRECURSOR
QUARTZ
SILICON
SPECTROSCOPY
SPIN
SUBSTRATES
THICKNESS
THIN FILMS
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Summary: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.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm201819p