8546 Notes
Macromolecules, Vol. 39, No. 24, 2006
Supporting Information Available: Detailed synthetic proce-
dures and characterization data for the monomers and polymers;
1
figures of FT-IR spectra, H NMR spectra, UV-vis spectra, TG
curves, and absorption spectra of polymers before and after poling.
This material is available free of charge via the Internet at http://
pubs.acs.org.
References and Notes
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Figure 2. Decay of SHG coefficient of polymers as a function of
temperature.
corona poling under electric field (Figure S4-8), according to
the equation described in Table 1 (footnote h). While the
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become more bulky. These results confirm the above discussion
and further prove that there is really a balance present when
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polymers containing this chromophore efficiently, it is important
to choose a suitable isolation spacer to meet the optimized point
in the balance caused by the introduction of the isolation spacers.
The dynamic thermal stabilities of the NLO activities of the
polymers (Figure 2) are investigated by depoling experiments,
in which the real time decays of their SHG signals are monitored
as the poled films are heated from 40 to 150 °C in air at a rate
of 4 °C/min. The results showed that the introduction of the
large size of the isolated groups to the chromophores benefits
the thermal stability of the resultant polymers, and P5 exhibits
the best thermal stability with the onset temperature for decay
at about 110 °C.
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Conclusion
In summary, an attempt is reported to modify nonlinear
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the chromophore moieties at the molecular level conveniently
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proved that the NLO properties of the polymers do not always
increase accompanying with the enlargement of the isolation
groups linked to the corresponding chromophore moieties, and
there is a suitable isolation group present for a chromophore to
boost its microscopic â value to possibly higher macroscopic
NLO property in polymers efficiently. Further study is still under
way in our lab.
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Acknowledgment. We are grateful to the National Science
Foundation of China (No. 20674059), the National Fundamental
Key Research Program, and Hubei Province for financial
support.
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