Linear and Nonlinear Optical Properties of Processable Polymeric Materials

1992 ◽  
Vol 247 ◽  
Author(s):  
Toshikuni Kaino ◽  
Satoru Tomaru ◽  
Takashi Kurihara ◽  
Michiyuki Amano
Keyword(s):  
Nonlinear Optical ◽  
Main Chain ◽  
Wavelength Region ◽  
Polymeric Materials ◽  
Polymer Backbone ◽  
Chain Polymer ◽  
Polymer Main Chain ◽  
Resonant Region ◽  
Channel Waveguides ◽  
Linear And Nonlinear

ABSTRACTLinear and nonlinear optical (NLO) polymeric materials with good processabilities are discussed. An azo-dye substituted copolymer (3RNO2, nitro-terminated diazo dye) are investigated. The polymer film was found to be transparent and attenuation loss was less than 2 dB/cm. The χ(3) of 3RNo2 reaches 5×10−11 esu in the near-resonant region. With polymers where the dye molecules are introduced into the polymer backbone (a main chain polymer), a χ(3) larger than 10−11 esu is obtained even in a monoazo dye introduced polymer. A new molecular crystal, symmetrically substituted benzylidene-aniline compound, SBAC for short, are also successfully polymerized (introduced into a polymer main chain) and their χ(3) values are revealed to be around 1010 esu in the near-resonant wavelength region. The optical transmission of these polymers is also investigated and revealed to be around 2 dB/cm. With poly(arylene vinylene), a certain population of χ-conjugation length will induce enhancement of the resonant χ(3) of the polymers. The polymer can be used to fabricate channel waveguides with the photo-bleaching technique.

Synthesis of novel organic-soluble high-temperature aromatic polymers

1995 ◽  
Vol 7 (3) ◽  
pp. 337-345 ◽  
Author(s):  
Yoshio Imai
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Main Chain ◽  
Phenyl Group ◽  
Current Work ◽  
Transition Temperatures ◽  
Polymer Backbone ◽  
Glass Transition Temperatures ◽  
Aromatic Polyamides ◽  
Polymer Main Chain

This paper reviews our current work on the synthesis of new organic-soluble aromatic polyamides and polyimides having high glass transition temperatures above 300 °C. Our strategy to achieve this goal is to introduce a bulky pendant phenyl group along the polymer backbone and to incorporate a crank and twisted non-coplanar structure into the polymer main chain.

Synthesis and Optical Properties of Copolymeres Bisphenol A and D-Π-A Chromophores

2014 ◽  
Vol 665 ◽  
pp. 292-295
Author(s):  
Ming Feng Fang ◽  
Chun Meng Pan ◽  
Chen Wang ◽  
Guo Yuan Lu
Keyword(s):  
Thermal Stability ◽  
Bisphenol A ◽  
Nonlinear Optical ◽  
Main Chain ◽  
Uv Spectra ◽  
Mitsunobu Reaction ◽  
Nlo Properties ◽  
Good Solubility ◽  
Linear And Nonlinear ◽  
Nonlinear Optical Coefficient

A series of optical polymeres were prepared by a Mitsunobu reaction from the correspondingN,N-dihydroxyethyl D-π-A chromophores and bisphenol A, which is new main-chain copolymeres with good solubility in ordinary organic solvents. The linear and nonlinear optical (NLO) properties were investigated by UV spectra and NLO measurements. The results indicate that the films of copolymeres exhibit a higher macroscopic second nonlinear optical coefficient, thermal stability and good optical transparency.

scholarly journals Λιθογραφικά υλικά που βασίζονται σε φωτοχημικά προκαλούμενη διάσπαση της κύριας αλυσίδας πολυακεταλών

2012 ◽  
Author(s):  
Θεόδωρος Μανουράς
Keyword(s):  
Main Chain ◽  
Cultured Cells ◽  
Polymeric Materials ◽  
Chain Scission ◽  
Device Fabrication ◽  
Laser Exposure ◽  
Photochemical Degradation ◽  
Bioactive Substances ◽  
Contact Printing ◽  
Polymer Main Chain

The present dissertation refers to the exploration of novel lithographic materials, based on photodegradable polymers of the polyketal/polyacetal family that undergo main chain scission via photochemically mediated pathways. Suitable synthetic methodologies were developed allowing the incorporation of selected chemical functionalities in the polymers resulted to absorption spectrum tuning for effective photolysis under preferred irradiation conditions either mediated by photoacid generators, or induced by direct polymer group excitation. In addition, the rational chemical design of the polymers, allowed optimization of a range of physicochemical parameters of the developed polymeric materials those were crucial in selective applications.In the quest for the development of materials for standard semiconductor lithography aiming at device fabrication, we achieved the synthesis of polymers with desirable physicochemical properties such as optimum solubility before and after exposure in selective solvents, and lithographic process acceptable glass transition temperatures. Polymeric materials based on photogenerated acid catalyzed degradation of the polymer main chain, produced upon UV exposure (248nm) and contact printing well-defined arbitrary patterns down to 500nm. In addition, it was demonstrated that lithographic materials based on a main chain scission mechanism can provide adequate resistance during standard plasma etching processes.On the other hand, in an effort to exploit possibilities offered by the direct photochemical degradation of the polymers, new processes of interest for biotechnological applications were proposed. It was first demonstrated the possibility of controlling the photolysis process via selecting appropriate chromophores at specific irradiation wavelengths covering the range from 193 to 365nm. Then, using laser exposure a novel process of forming patterns on cultured cells developed on the polymer substrates was introduced. Furthermore, the possibility of effective multiphoton photolysis was achieved by laser irradiation at 512 and 1064 nm through a photomask. Finally, a block copolymer was synthesized based on a photosensitive polyketal block and a polyethylene oxide block which was shown to form polymer micelles that were loaded with bioactive substances and served as a photolabile drug delivery agent against HeLa cancer cells.

Main-Chain Ferrocene-Containing Polymers Prepared by Acyclic Diene Metathesis Polymerization: A Review

2020 ◽  
Vol 24 (9) ◽  
pp. 1010-1017 ◽  
Author(s):  
Ye Sha ◽  
Zhihua Shen ◽  
Huan Jia ◽  
Zhenyang Luo
Keyword(s):  
Main Chain ◽  
Functional Unit ◽  
Polymeric Materials ◽  
Acyclic Diene Metathesis ◽  
Polymer Backbone ◽  
Design Synthesis ◽  
Admet Polymerization ◽  
Mild Conditions ◽  
Diene Metathesis ◽  
Iron Center

Ferrocene, the crown of metallocene family, is widely studied as a functional unit in electrochemical and catalytic applications due to its sandwich structure. Ferrocene moieties can be embedded into the polymer backbone, leading to main-chain ferrocenecontaining polymers. These polymeric materials combine the unique functionalities of iron center with the processabilities of polymers. As one of the choice polymerization techniques, acyclic diene metathesis (ADMET) polymerization serves as a versatile method to prepare main-chain ferrocene-containing polymers under mild conditions using α,ω-dienes as monomers. This paper overviews main-chain ferrocene-containing polymers prepared by ADMET polymerization. Advances in the design, synthesis and applications of this class of organometallic monomers and polymers are detailed.

Linear and Nonlinear Optical Properties of Novel Ionic Chromophores

1999 ◽  
Vol 598 ◽  
Author(s):  
Xuan-Ming Duan ◽  
Tatsuo Wada ◽  
Shuji Okada ◽  
Hidetoshi Oikawa ◽  
Hiro Matsuda ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Maximum ◽  
Optical Materials ◽  
Nonlinear Optical ◽  
Wavelength Region ◽  
Semiempirical Calculation ◽  
Nonlinear Optical Properties ◽  
Nonlinear Optical Materials ◽  
Neutral Compounds ◽  
Linear And Nonlinear

ABSTRACTA series of novel ionic chromophores consisting of a carbazole moiety and pyridinium rings connected by a double bond have been designed and synthesized as nonlinear optical materials. Their linear and nonlinear optical properties were investigated by semiempirical calculation and experiment. The absorption maximum wavelengths (lmax) of these ionic chromophores showed shifting to longer wavelength region than their corresponding electrically neutral compounds. These ionic chromophores possess large first hyperpolarizabilities (b).

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.

Thermo-switchable Polymer Dielectrics

2011 ◽  
Vol 1312 ◽  
Author(s):  
Ross S. Johnson ◽  
Fenil M. Kholwadwala ◽  
Shawn M. Dirk
Keyword(s):  
Thin Film ◽  
Elevated Temperatures ◽  
Main Chain ◽  
Electrical Characterization ◽  
Phenylene Vinylene ◽  
Polymer Backbone ◽  
Polymer Main Chain ◽  
Thin Film Capacitors ◽  
Leaving Groups

ABSTRACTWe are interested in utilizing the thermo-switchable properties of precursor poly(p-phenylene vinylene) (PPV) polymers to develop capacitor dielectrics that will fail at specific temperatures due to the material irreversibly switching from an insulator to a conducting polymer. By utilizing different leaving groups on the polymer main chain, the temperature at which the polymer transforms into a conductor can be varied over a range of temperatures. Electrical characterization of thin-film capacitors prepared from several precursor PPV polymers indicates that these materials have good dielectric properties until they reach elevated temperatures, at which point conjugation of the polymer backbone effectively disables the device. Here, we present the synthesis, dielectric processing, and electrical characterization of a new thermo-switchable polymer dielectric.

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