Evidence Of Photo-Oxidation In Photobleaching Process Of Nonlinear Optical Polymer

1995 ◽  
Vol 413 ◽  
Author(s):  
M. H. Lee ◽  
H. J. Lee ◽  
S. G. Han ◽  
H. -Y. Kim ◽  
Y. H. Won
Keyword(s):  
Nonlinear Optical ◽  
Side Chain ◽  
Conformational Transformation ◽  
Photo Degradation ◽  
Photo Oxidation ◽  
Optical Polymer ◽  
Nonlinear Optical Polymers ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores ◽  
Nonlinear Optical Polymer

ABSTRACTThe photobleaching mechanism of nonlinear optical polymers has been investigated; the PMMA based polymers with nonlinear optical chromophores, 4-dimethylamino-4'-nitro-stilbene (DANS), 4-dimethylamino-4'-hexylsulfone-stilbene (DASS), and 4'-(2-hexyloxyethyl) ethyl amino-4-nitro azobenzene (DR-16). The photobleaching was carried out using near-UV lines. FTIR spectra and UV-VIS absorption spectra were obtained after each photobleaching. Refractive indices were measured in the photobleaching processes. The results suggest that the photobleaching mechanism of two PMMA based side-chain polymers with DANS and DASS chromophores results from the photo-oxidation and that of the PMMA based host-guest polymer with DR-16 chromophore results from the combination of the photo-degradation and the trans-cis conformational transformation.

Anchoring both ends of the chromophore in the side-chain nonlinear optical polymer for improved thermal stability

1993 ◽  
Author(s):  
Yongqiang Shi ◽  
Peter M. Ranon ◽  
William H. Steier ◽  
Chengzeng Xu ◽  
Bo Wu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Optical Polymer ◽  
Nonlinear Optical Polymer

Local forms of molecular mobility in copolymethacrylates containing side-chain nonlinear optical chromophores

2008 ◽  
Vol 46 (14) ◽  
pp. 1488-1496 ◽  
Author(s):  
Natalia A. Nikonorova ◽  
Nikolai N. Smirnov ◽  
Ricardo Diaz-Calleja ◽  
Alexander V. Yakimansky
Keyword(s):  
Molecular Mobility ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

scholarly journals Preparation of the Inclusion Complex-Type Nonlinear Optical Polymer

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Li-Fen Wang ◽  
Jyun-Wun Chen ◽  
Jyun-Wei Chen
Keyword(s):  
Inclusion Complex ◽  
Nonlinear Optical ◽  
Complex Method ◽  
Complex Type ◽  
Photochromic Properties ◽  
Optical Polymer ◽  
Nonlinear Optical Polymers ◽  
Corona Poling ◽  
Nlo Chromophores ◽  
Nonlinear Optical Polymer

This study uses the inclusion complex method to import nonlinear optical (NLO) chromophores, disperse red1 (DR1), and spiropyran (SP), into theγ-CD cavity of theγ-cyclodextrin polymer (γ-CDP) to prepare orderly aligned nonphotocontrollable and photocontrollable nonlinear optical polymers. Calculations support the ultraviolet/visible analyses and suggest the formation of the 1 : 2 DR1/γ-CDP and 1 : 2 SP/γ-CDP inclusion complexes. Upon complexation, the DR1 and SP molecules are free to align themselves along an applied electric field and show high order parameters of approximately 0.48 and 0.20, respectively. Reversible photochromic reactions exhibit that the SP/γ-CDP complex still retains the photochromic properties following corona poling.

Investigation of Dipolar Relaxation Processes in a Side-Chain Nonlinear Optical Polymer

1996 ◽  
Vol 446 ◽  
Author(s):  
Z. -Y. Cheng ◽  
R. S. Katiyar ◽  
S. Bauer ◽  
S. Bauer-Gogonea
Keyword(s):  
Glass Transition ◽  
Dielectric Spectroscopy ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Relaxation Processes ◽  
Dipolar Relaxation ◽  
Depolarization Current ◽  
Chain Polymer ◽  
Optical Polymer ◽  
Nonlinear Optical Polymer

AbstractAmorphous thin films of a typical side-chain nonlinear optical polymer were investigated by means of dielectric spectroscopy and thermally stimulated depolarization current (TSDC) within the temperature range -40°C to 230°C. Three distinct relaxation processes, labelled α, β and γ were observed. The α-relaxation, associated with the glass transition, is well described by the Vogel-Fulcher relation, while the sub glass transition β and γ-relaxation follow Arrhenius relations. The advantage of TSDC over dielectric spectroscopy is demonstrated for the investigation of the weak β-relaxation in the side-chain polymer. Furthermore, the β -relaxation is responsible for the initial, fast decay of the electro-optical response of the side-chain polymer at room temperature.

Second-Order Nonlinear Optical Polymer by Directed Lithiation of Polyethersulfone

1997 ◽  
Vol 488 ◽  
Author(s):  
Harold E. McCarron ◽  
Christopher J. Walsh ◽  
Rajashree Sen ◽  
Braja K. Mandal
Keyword(s):  
Nonlinear Optical ◽  
Second Order ◽  
Optical Polymers ◽  
Optical Polymer ◽  
Nonlinear Optical Polymers ◽  
Nonlinear Optical Polymer

AbstractDirected lithiation of a polyethersulfone and the reactions of the lithiated species have been investigated. This method provides a new route to second-order nonlinear optical polymers.

Synthesis and Characterization of Star Polypeptide Nonlinear Optical Materials

1994 ◽  
Vol 351 ◽  
Author(s):  
Thomas M. Cooper ◽  
Weijie Su ◽  
Zbigniew Tokarski ◽  
W. Wade Adams
Keyword(s):  
Metal Ion ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Tetraphenyl Porphyrin ◽  
N Terminus ◽  
Porphyrin Core ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores ◽  
Selection Of

ABSTRACTTo develop novel polypeptide-based thin films, a series of star polypeptides modified with nonlinear optical chromophores has been synthesized. Using amino-substituted tetraphenyl porphyrin as an initiator, the N-carboxy anhydride of γ-benzyl L-glutamic acid was polymerized onto the porphyrin at a monomer to initiator ratio 20:1. The resulting four-branch star was modified with a selection of dyes. Dyes that modified both the N-terminus and benzyl side chain were used. We demonstrated feasibility of insertion of a metal ion into the polypeptide porphyrin core. The polypeptide series was characterized by UV/VIS, FTIR, and CD. The UV/VIS data suggested ease of modification of both the N-terminus and side chains. The FTLR and CD data show the resulting polypeptides were ∝-helical. The results demonstrate the feasibility of modifying the optical properties of a porphyrin by three approaches: insertion of metal, attachment of dye to N-terminus or modification of γ-benzyl L-glutamate side chain.

A Synthetic Approach for the Incorporation of Highly Efficient, Thermally Stable Second Order Nonlinear Optical Chromophores Into Side-Chain Polymers

1993 ◽  
Vol 328 ◽  
Author(s):  
Kevin J. Drost ◽  
Alex K-Y. Jen ◽  
V. Pushkara Rao ◽  
R. M. Mininni
Keyword(s):  
Nonlinear Optical ◽  
Second Order ◽  
Side Chain ◽  
Synthetic Approach ◽  
Synthetic Method ◽  
Side Chains ◽  
Thermally Stable ◽  
Highly Efficient ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

ABSTRACTA new synthetic method is developed to incorporate efficient nonlinear optical chromophores containing thiophene conjugating units and tricyanovinyl acceptors into side-chain polymers. This approach emphasizes the incorporation of the tricyanovinyl groups into the pendant side chains after the desired polymer is formed.

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