Second Order Nonlinear Optical Properties of Multifunctional Chiral Azobenzene Polymers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Luigi Angiolini ◽  
Tiziana Benelli ◽  
Renato Bozio ◽  
Matteo Cozzuol ◽  
Loris Giorgini ◽  
...  
Keyword(s):  
Main Chain ◽  
Second Harmonic ◽  
Optically Active ◽  
Polymeric Films ◽  
Side Chain ◽  
Nlo Properties ◽  
Azobenzene Moiety ◽  
Corona Poling ◽  
Thermal Stability Of

AbstractCorona poling behaviours of optically active photochromic copolymers derived from methyl methacrylate (MMA) and the methacrylic ester of (S)-3- hydroxy pyrrolidine linked through the nitrogen atom to the highly conjugated photochromic 4'-(β-cyano-β-(methylsulfonyl)vinyl)-4-azobenzene moiety, have been investigated with the aim to evaluate the effect on the non-linear optical (NLO) properties originated by the presence of inactive side-chain MMA groups along the main chain. The NLO properties of in situ corona poled polymeric films have been studied by second harmonic generation (SHG) measurements. The d33 values of the investigated polymers were determined to be in the range 10-86 pm/V after corona poling. The temporal and thermal stability of the optimal SHG signals obtained after corona poling process of all the macromolecular materials has been investigated and compared. The results indicate that the maximum of these properties can be obtained at a molar content of photochromic units around 20- 40%.

scholarly journals Methacrylic polymers bearing side-chain permanent dipole azobenzene chromophores spaced from the main chain by chiral moieties

e-Polymers ◽  
2001 ◽  
Vol 1 (1) ◽  
Author(s):  
Luigi Angiolini ◽  
Daniele Caretti ◽  
Loris Giorgini ◽  
Elisabetta Salatelli
Keyword(s):  
Thermal Properties ◽  
Nitrogen Atom ◽  
Methyl Methacrylate ◽  
Main Chain ◽  
Optically Active ◽  
Side Chain ◽  
Azobenzene Moiety

AbstractOptically active photochromic copolymers, deriving from methyl methacrylate (MMA) and the methacrylic ester of (S)-3-hydroxypyrrolidine linked through the nitrogen atom to the highly conjugated photochromic 4'-(β-cyano-β- (methylsulfonyl)vinyl)-4-azobenzene moiety, have been prepared and characterized with the aim to evaluate the effect on their chiro-optical and thermal properties exerted by the insertion of inactive MMA groups along the main chain. The results indicate that these properties are still remarkable at a content of photochromic units as low as 26 mol-%.

Second-Order Nonlinear Optical Polymers With Different Chromophore Arrangements

1993 ◽  
Vol 328 ◽  
Author(s):  
Bo Wu ◽  
Chengzeng Xu ◽  
Larry R. Dalton ◽  
Srinath Kalluri ◽  
Yongqiang Shi ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Main Chain ◽  
Second Harmonic ◽  
Polymeric Materials ◽  
Second Order ◽  
Side Chain ◽  
Optical Polymers ◽  
Nonlinear Optical Polymers ◽  
Main Chain Polymers

ABSTRACTSecond-order nonlinear optical polymers can be divided into four groups regarding arrangements of chromophore dipoles in polymer backbones, namely, side-chain polymers, random, head-to-tail, and head-to-head Main-chain polymers. A variety of polymers with the aforementioned configurations have been designed and synthesized from functionalized amino-nitro azobenzene chromophores. Poling processes of these polymeric materials have been investigated by in-situ poling and second-harmonic generation detection.

Methacrylic polymers bearing side-chain permanent dipole azobenzene chromophores spaced from the main chain by chiral moieties, 3 a Synthesis and chiroptical properties of the homopolymer of (R)-3-methacryloyloxy-1-(4’-nitro-4-azobenzene)- pyrrolidine and of copolymers with the enantiomeric monomer (S)-3-methacryloyloxy-1-(4’-nitro-4-azobenzene)- pyrrolidine

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Luigi Angiolini ◽  
Loris Giorgini ◽  
Elisabetta Salatelli
Keyword(s):  
Radical Polymerization ◽  
Optical Activity ◽  
Main Chain ◽  
Optically Active ◽  
Side Chain ◽  
Chiroptical Properties

Abstract The optically active photochromic homopolymer deriving from radical polymerization of the monomer (R)-3-methacryloyloxy-1-(4’-nitro-4-azobenzene)- pyrrolidine, containing a chiral group of one prevailing configuration interposed between the methacrylic moiety and the photochromic azoaromatic chromophore, has been synthesized and characterized. Copolymers with the enantiomeric monomer (S)-3-methacryloyloxy-1-(4’-nitro-4-azobenzene)pyrrolidine have also been prepared in order to evaluate the effect on the overall optical activity of side chain chiral groups of opposite configuration in various ratios. The spectroscopic and chiroptical properties in solution of the polymeric derivatives have been assessed.

scholarly journals KINETIC'S INVESTIGATION OF METHACRYLIC MONOMERS BASED ON 2-STYRYLQUINOLINE

2019 ◽  
pp. 39-42
Author(s):  
O. Kharchenko ◽  
V. Smokal ◽  
O. Krupka ◽  
A. Kolendo
Keyword(s):  
Polymer Chain ◽  
Main Chain ◽  
Light Transmission ◽  
Present Knowledge ◽  
Side Chain ◽  
Relaxation Processes ◽  
Photosensitive Polymers ◽  
Nlo Properties ◽  
Acceptor Group ◽  
Methacrylic Monomers

Polymethylmethacrylate is widely use material in optics due to its atmosphere resistance, chemical stability, good mechanical properties, transparency and light transmission. Due to these properties, PMMA is often used as a polymeric matrix for creating photosensitive polymers and polymers with nonlinear optical (NLO) properties. Materials with NLO properties can be made by introducing moleculas of chromophores into the polymer chain. There are two fundamentally different ways of doing this. The first is to create composite material where the chromophore is a dispersed phase and is introduced into the system as a "guest". In the second case, the chromophore is introduced into the polymer chain covalently, and can be included in the side and the main chain. Studies of polymers containing NLO chromophore in the side chain have shown a number of advantages: better orientation of the chromophores under the action of an electric field; relaxation processes are much slower; increasing time and thermal stability; increasing the glass transition temperature of the polymer. Based on present knowledge we decided to design new methacrylic polymers with styrylquinoline chromophore in side chain. The polymerization ability of the new monomers for free radical homopolymerization was investigated kinetically by using dilatometric method. It was found that new 2-styrylquinoline containing monomers are able to homopolymerization with high conversions (63–83%). The polymerization was carried out in DMF using 2,2´-azobisisobutyronitrile as initiator at 80°C in argon atmosphere. The products of polymerization were characterized by 1H NMR spectroscopy. It was installed that all new monomers have bigger speed of polymerization (Ksum= 1.36–8.33×103 l/mol×s) then methylmethacrylate (Ksum= 0.5×103 l/mol×s), phenylmethacrylate (Ksum= 1.1×103 l/mol×s) and similar to polymerization of 2-methyl-8-oxyquinoline methacrylate (Ksum= 3.28×103 l/mol×s). It was found that speed of polymerization increases with increasing electron donating power of substitute in paraposition of the aromatic ring. It has been proven that presence of electron acceptor group reduces speed of polymerization.

THE SYNTHESIS, CHARACTERIZATION, AND PHOTOCHEMICAL CROSSLINKING OF AN NLO EPOXY POLYMER

1996 ◽  
Vol 05 (02) ◽  
pp. 437-446 ◽  
Author(s):  
T. GOODSON ◽  
J.M. TAKACS ◽  
C.H. WANG ◽  
L. ZHANG
Keyword(s):  
Bisphenol A ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Epoxy Polymer ◽  
Second Harmonic ◽  
Temporal Stability ◽  
Side Chain ◽  
Photochemical Crosslinking ◽  
Corona Poling

A photocrosslinkable second order nonlinear optical (NLO) epoxy polymer, Bisphenol A-Nitroaminotolane, containing covalently attached cinnamate side chain substituents (BisA-NAT-CM), was synthesized. After corona poling Second Harmonic Generation (SHG) is used to measure the relaxation of the anisotropy after the electric field is removed. Upon photolysis at 260 nm the cinnamoyl side chains undergo photochemical dimerization to crosslink the NLO polymer. Photobleaching is not a problem under these conditions. The photocrosslinked NLO polymer shows virtually no relaxation over a period of 500 hours at room temperature and good temporal stability at temperatures as high as 110°C.

scholarly journals Synthesis and thermal properties of silicon-containing benzoxazine

2019 ◽  
Vol 32 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Kai Zeng ◽  
Hui Li ◽  
Haixia Shi ◽  
Jiayu Wu ◽  
Jilei Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Main Chain ◽  
Proton Nuclear Magnetic Resonance ◽  
In Situ Ftir ◽  
Degradation Temperature ◽  
Thermal Stability Of

A novel benzoxazine, containing silicon (Si) in the main chain and bonded to two benzene ring, was synthesized from aniline, bis( p-hydroxyphenyl)dimethylsilane, and paraformaldehyde. The structure was characterized by proton nuclear magnetic resonance and Fourier transform infrared (FTIR) spectra. The curing behavior of the benzoxazine was evaluated by differential scanning calorimeter and in situ FTIR. The thermal stability of the resulting polybenzoxazine was studied by thermogravimetric analysis under nitrogen and air atmospheres. The results indicated that the Si-containing polybenzoxazine possessed significantly higher initial degradation temperature and char yield than conventional bisphenol A/aniline-based polybenzoxazine.

SECOND-ORDER NONLINEAR OPTICAL POLYIMIDES WITH HIGH THERMAL STABILITY

1999 ◽  
Vol 08 (04) ◽  
pp. 461-468 ◽  
Author(s):  
PEIWANG ZHU ◽  
PENG WANG ◽  
WEI WU ◽  
CHENG YE
Keyword(s):  
Thermal Stability ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
High Thermal Stability ◽  
Measurement Technology ◽  
Addition Polymerization ◽  
Second Harmonic Generation Measurement ◽  
Thermal Stability Of

Two high Tg (250°C and 258°C) polyimides embedded with triphenyl imidazole chromophores were synthesized through addition polymerization. Simultaneous poling and polymerization and in situ second harmonic generation measurement technology were carried on to evaluate the thermal stability of the poling induced orientations. Moderate d33 values of 15 pm/V and 16 pm/V were determined. The SHG signals of these poled polymer films are without any decay at temperature lower than 150°C, it begins to relax rapidly over 195°C. The half-decay temperatures of the samples' orientation are as high as 240°C and 24°C respectively.

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