Please use this identifier to cite or link to this item: https://doi.org/10.1002/pola.22790
Title: Stilbene-containing polyactylenes: Molecular design, synthesis, and relationship between molecular structure and NLO properties
Authors: Su, X.
Xu, H.
Guo, Q.
Shi, G.
Yang, J.
Song, Y.
Liu, X. 
Keywords: NLO
Optical limiting
Polyacetylenes
Structure-property relations
Synthesis
Issue Date: 1-Jul-2008
Citation: Su, X., Xu, H., Guo, Q., Shi, G., Yang, J., Song, Y., Liu, X. (2008-07-01). Stilbene-containing polyactylenes: Molecular design, synthesis, and relationship between molecular structure and NLO properties. Journal of Polymer Science, Part A: Polymer Chemistry 46 (13) : 4529-4541. ScholarBank@NUS Repository. https://doi.org/10.1002/pola.22790
Abstract: Polyacetylenes (P1-P4) containing different stilbene groups, -[(CH=C) -Ph-CH=CH-Ph-R]n-(R=OCmH2m+1 (m = 4 (P1), 10 (P2), 16 (P3)), or NO2 (P4)) were designed and synthesized, respectively, using [Rh(nbd)Cl]2 as a catalyst. Their structures and properties were characterized and evaluated by FTIR, 1H-NMR, 13CNMR, GPC, and UV, PL, respectively. The optical limiting and nonlinear optical properties were investigated by using a frequency doubled, Q-switched, mode-locked Continuum ns/ps Nd:YAG laser system and their optical limiting mechanism was discussed. It is surprising to see that the stilbene pendants endow the polyacetylenes with a high thermal stability (Td ≥ 270 °C), novel optical limiting properties and large third-order nonlinear optical susceptibilities (up to 4.61 × 10-10 esu). The optical limiting mechanism is mainly originated from reverse saturable absorption of molecules. In addition, it is found that the polymer with electron accepted NO2 moiety exhibits better optical properties than that with electron donated alkoxy group because of larger n electron delocalization and dipolar effect. The strong interaction between stilbene pendants and the polyene main chain significantly results in red-shift of fluorescence emitting peak. © 2008 Wiley Periodicals, Inc.
Source Title: Journal of Polymer Science, Part A: Polymer Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/98024
ISSN: 0887624X
DOI: 10.1002/pola.22790
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