Synthesis and Characterization of Novel Side-Chain Nonlinear Optical Polymers Based on Poly(1,6-heptadiyne) Derivatives

Lee, Hyung-Jong; Kang, Su-Jin; Kim, Kwan Kyu; Cho, Hyun‐Nam; Park, Joon-Taik; Choi, Sam‐Kwon

doi:10.1021/ma00117a039

Cited by 26 publications

(14 citation statements)

References 9 publications

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“…This relaxation process would depend on the temperature and molecular structure of both the polymer and the chromophore. Apart from such molecularly doped polymeric systems, the NLO moieties can also be covalently bound to the polymer molecule, either as a pendant side chain , or as an integral part of the backbone. − The extent of order achievable in such covalently linked systems is typically lower than in doped systems, especially in cases where the chromophores form a part of the polymer backbone. Despite this disadvantage, the much higher number densities achievable in covalently linked systems make them attractive candidates for potential applications.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Behavior of Twin Nonlinear Optical Chromophores: Effect of the Spacer Length

et al. 1999

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A new series of twin nonlinear optical (NLO) molecules, having two 4-nitrophenol chromophores that are linked via a flexible polymethylene spacer of varying length [(CH 2 ) n , n ) 1-12], were synthesized. Powder second harmonic generation measurements of these twin samples indicated a pronounced odd-even oscillation, with the odd twins exhibiting a high SHG value while the even ones gave no measurable SH signal. This behavior reflects the crystal packing preferences in such twin NLO systems that have odd and even numbers of atoms linking themsthe even ones appear to prefer a centrosymmetric packing arrangement. The orientational/disordering dynamics of these twin NLO molecules, doped in a polymer (poly(methyl methacrylate)) matrix, has also been studied using SHG in electric field poled samples. Interestingly, the maximum attainable SH signal, (2) , in the poled samples also showed an odd-even oscillation; the odd ones again having a higher value of (2) . This unprecedented odd-even oscillation in such molecularly doped systems is rationalized as being due to the intrinsically greater ease of a parallel alignment of the two chromophores in the twins with an odd spacer than in those with an even one. Further, the temporal stability of the SHG intensity at 70°C, after the removal of the applied corona, was also studied. The relaxation of all the twin chromophores followed a biexponential decay; the characteristic relaxation time (τ 2 ) for the slow decay component suggests that while the twin with a single methylene unit relaxes relatively slowly, the relaxation is significantly faster in cases where n ) 2 and 3. In the twins with even longer spacer segments, the relaxation again becomes slower and reaches a saturation value. The observed minimum appears to reflect the interplay of two competing factors that affect the chromophore alignment in such twin systems, namely, the electrostatic repulsion between neighboring oriented dipoles and the intrinsic flexibility of the spacer.

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Section: Introductionmentioning

confidence: 99%

Relaxation Behavior of Twin Nonlinear Optical Chromophores: Effect of the Spacer Length

et al. 1999

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“…Moreover, the research of an NLO‐conjugated polymer focuses on the thermal stability, due to the rigid polymer main chain in the past. However, the hard and stiff polymer backbone easily caused the low NLO efficiency 7b,7h,9. The reason for PCzCCSO 2 exhibiting outstanding NLO properties may be explained as follows: This NLO polymer was constructed through continuous conjugation in backbone and chromophores, so the unusual conjugation extension exhibits numerous dipole moments with various conjugation lengths, unlike most NLO‐polymer systems, in which the conjugation of chromophores is finite.…”

Section: Resultsmentioning

confidence: 99%

Novel π‐Electron Extension System via Chromophores Self‐Polymerization to Enhance the NLO Efficiency

Tsai

Chang

et al. 2007

Macromol. Rapid Commun.

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A new strategy for the self‐polymerization of chromophores is investigated to develop a 2,7‐carbazole‐based nonlinear optical (NLO) conjugated polymer with an increasing conjugation length of chromophores. Elongation of the conjugation‐path length in chromophores has established engineering guidelines to enhance optical nonlinearity. Compared with the traditional synthesis of an NLO polymer, the chromophores should be well‐designed at a limited conjugation spacer, and then incorporated into a polymer matrix. In this research, the π‐conjugation spacer of chromophores extended perpendicularly to the dipole of chromophores during the polymerization process. Furthermore, this study marks the first research of integrating the π‐electrons of chromophores and conjugated polymers. These conjugated backbones promote a bulk‐polarization response, leading to large NLO coefficients.

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“…Furthermore, the red-phase PDA also has a strong fluorescence while the blue one does not, which can be used potentially in other fields including cell imaging and information storage [18][19][20][21][22][23][24]. On the other hand, PDAs have being also considered as one kind of very important functional optoelectronic materials, among which third-order nonlinear optical (NLO) properties of PDAs have been found to be most promising because of its enhanced NLO susceptibility and a short response time [25,26]. Moreover, very recently, there emerge some investigations using PDAs as organic field effect transistors due to their high charge carrier mobility in the chain direction [27,28].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, structural characterization and sensing properties of polydiacetylene nanofibers templated from anodized aluminum oxide

Tong

Cheng

Liu

et al. 2011

Sensors and Actuators B: Chemical

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Synthesis and Characterization of Novel Side-Chain Nonlinear Optical Polymers Based on Poly(1,6-heptadiyne) Derivatives

Cited by 26 publications

References 9 publications

Relaxation Behavior of Twin Nonlinear Optical Chromophores: Effect of the Spacer Length

Relaxation Behavior of Twin Nonlinear Optical Chromophores: Effect of the Spacer Length

Novel π‐Electron Extension System via Chromophores Self‐Polymerization to Enhance the NLO Efficiency

Fabrication, structural characterization and sensing properties of polydiacetylene nanofibers templated from anodized aluminum oxide

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