Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene) Page: 4 of 8
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
pellet) displays expected bands at 1608, 1440, and 3448 cm' for -COOH vibrations, bands at
1440 and 1196 cm' for -SO3H vibrations, bands at 3060, 1130 and 1046 cm' for Ar-H
vibrations, and bands at 809 and 690 cm1 for phenyl rings in PPP backbone.
The aqueous solution of sulfonated poly(para-phenylene) emits very brilliant blue light
when irradiated by UV light. The emission spectrum of sulfonated PPP aqueous solution is
com ared with the emission spectrum for PPPco2 solution in Figure 2 with the same concentration
(10- M). Figure 3 displayed the photoluminescent spectra of a 100-bilayer-film of self-assembled
PPP and PDDA. It is noticed that the introduction of -SO3H(M) functional groups onto the
polymer backbone caused the blue-shift for either absorption or photoluminescence spectrum.
This phenomenon can be explained with either electron withdrawing effect or interruption of n-
conjugation. It is more likely that the band gaps between conducting band and valence band is
increased by the introduction of negatively charged electron withdrawing group such as -
SO3H(M). Comparing the blue shift effect for aqueous polymer solution, the effect is relatively
small to the modified PPP/PDDA bilayer film. The explanation might be weak spatial interactions
among the PPP layers through the PDDA linker. As shown in Figure 2, the caboxylaed PPP emits
blue light with a maximum intensity at about 430 nm, but the modified PPPso3 with both sulfonate
and carboxylate groups emits very brilliant blue light with maximum intensity at 380 nm and
covered a narrow spectrum range from 355 to 450 nm. The emission spectrum of the 100-bilayer
PDDA/PPP films has the maximum intensity at 411 nm (Figure 3) with a shoulder at about 430
Sulfonated PPP Solution
"N 0.8 PPPCOOK Solution 30
5 0.6 -20
350 400 450 500 550 600
Figure 2. The solution emission spectra of poly(p-quarterphenylene- 2,2'-
dicarboxylic acid (referred as PPPco3) and Poly(p-quarterphenylene- disulfonic-
dicarboxylic acid(referred as PPPso3).
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Shi, X.; Li, D.Q.; Luett, M.; Fitzsimmons, M.R. & Van Patten, G.P. Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene), report, March 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc706283/m1/4/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.