Main chain copolysiloxanes with terthiophene and perylenediimide units: synthesis, characterization and electrical memory

2017 ◽  
Vol 8 (22) ◽  
pp. 3515-3522 ◽  
Author(s):  
Zhen Chen ◽  
Tingjie Zhang ◽  
Yi Zhang ◽  
Zhongjie Ren ◽  
Jianming Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Main Chain ◽  
High Thermal Stability ◽  
Donor Acceptor ◽  
Memory Characteristics

A main chain donor–acceptor copolysiloxane PBIClSi-alt-PTSi for resistor type memory has been designed and synthesized. The PBIClSi-alt-PTSi possesses high thermal stability and shows nonvolatile write-once-read many times (WORM) memory characteristics.

Novel polyhydrazides and polyoxadiazoles based on 1,3,4‐thiadiazole moiety in the main chain with high thermal stability, good solubility, and notable antimicrobial activity

2019 ◽  
Vol 136 (28) ◽  
pp. 47770 ◽  
Author(s):  
Kamal I. Aly ◽  
Osama Younis ◽  
Nayef S. Al‐Muaikel ◽  
Ahmed A. Atalla ◽  
Abu‐Bakr A. A. M. El‐Adasy ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Antimicrobial Activity ◽  
Main Chain ◽  
High Thermal Stability ◽  
Good Solubility

Synthesis of Main-Chain Polyimides Containing Azoaryl and their Third-Order NLO Properties

2011 ◽  
Vol 306-307 ◽  
pp. 215-219
Author(s):  
Jie Ping Shi ◽  
Li Wei ◽  
Hong Wen Hu ◽  
Ting Chao He ◽  
Xiao Qiang Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Main Chain ◽  
High Thermal Stability ◽  
Azo Compounds ◽  
Third Order ◽  
Nlo Properties ◽  
The Third ◽  
Good Solubility ◽  
Azo Group ◽  
532 Nm

A series of main-chain polyimides containing azo aryl with different substituted groups have been synthesized by a condensation of corresponding N,N-dichloroethylaminoaryl azo compounds with 4,4’-(hexafluoroisopropylidene) diphthalic bis-imide in an alkaline DMF solution, which have high thermal stability and good solubility in organic solvents. The third-order NLO measurements made with Z-scan technique at 532 nm indicate that the polyimides containing p-nitrophenylazo and nitrobenzothiazole azo group (P2 and P3) have larger third-order nonlinear absorption coefficient (ß) and the nonlinear refractive coefficient (n2).

Main-chain azo polyaramides with high thermal stability and liquid crystal properties

2008 ◽  
Vol 16 (4) ◽  
pp. 455-460 ◽  
Author(s):  
Junlong Yao ◽  
Yanjiao You ◽  
Youan Lei ◽  
Lijie Dong ◽  
Chuanxi Xiong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Liquid Crystal ◽  
Main Chain ◽  
High Thermal Stability ◽  
Crystal Properties

Effect of reactants’ concentration on the ratio and yield of E,Z isomers of isatin-3-(4-phenyl)semicarbazone and N-methylisatin-3-(4-phenyl)semicarbazone

2013 ◽  
Vol 67 (1) ◽  
Author(s):  
Klaudia Jakusová ◽  
Martin Gáplovský ◽  
Jana Donovalová ◽  
Marek Cigáň ◽  
Henrieta Stankovičová ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solvent Effect ◽  
Theoretical Calculations ◽  
High Thermal Stability ◽  
Intramolecular Interactions ◽  
Experimental Results ◽  
Isomer Ratio ◽  
Donor Acceptor ◽  
E And Z Isomers

AbstractIn this work, the effect of inter- and intramolecular interactions of reactants and products, reactants concentration as well as the solvent effect on the ratio of E and Z isomers of isatinphenylsemicarbazones in the reaction mixture is examined. Theoretical calculations proved that Z isomers are more stable than E isomers. Experimental results confirmed the noncovalent intermolecular donor-acceptor interactions of the reactants in the reaction mixture at concentrations above 0.1 mol L−1. The E/Z isomer ratio of isatin-3-(4-phenyl)semicarbazone (I) and N-methylisatin-3-(4-phenyl)semicarbazone (II) depends on the initial concentrations of 3-amino-1-phenylurea (phenylsemicarbazide; V) and 1H-indole-2,3-dione (isatin; III), or 3-methylindol-2,3(1H)-dion (3-methylisatin; IV), respectively. Both isomers exhibit high thermal stability. Thermal E-Z isomerization takes place at temperatures above 70°C in N,N-dimethylformamide.

SYNTHESIS OF NOVEL Y-TYPE POLYURETHANES WITH HIGH THERMAL STABILITY OF DIPOLE ALIGNMENT AND THEIR ELECTRO-OPTIC PROPERTIES

2005 ◽  
Vol 14 (03) ◽  
pp. 341-355 ◽  
Author(s):  
JU-YEON LEE ◽  
WON-TAEK JUNG ◽  
BUM KU RHEE
Keyword(s):  
Thermal Stability ◽  
Main Chain ◽  
High Thermal Stability ◽  
Scanning Calorimetry ◽  
Electro Optic ◽  
Chain Character ◽  
Device Applications ◽  
Nlo Chromophores ◽  
Thermal Stability Of ◽  
Dipole Alignment

3,4-di-(2′-hydroxyethoxy)benzylidenemalononitrile (3) was prepared and condensed with 2,4-toluenediisocyanate, 1,6-hexamethylenediisocyanate and 3,3′-dimethoxy-4,4′-biphenylenediisocyanate to yield novel Y-type polyurethanes (4-6) containing 3,4-dioxybenzylidenemalononitrile groups as nonlinear optical (NLO) chromophores, which are parts of the polymer backbones. The resulting polyurethanes 4-6 were soluble in common organic solvents such as acetone and DMSO. Polymers 4-6 exhibited a thermal stability up to 260°C from thermogravimetric analysis (TGA) with differential scanning calorimetry (DSC) with T g values in the range of 96–152°C. The SHG coefficients (d33) of poled polymer films were around 6.8 × 10-9 esu. These poled polymers exhibited a high thermal stability of dipole alignment even at 20°C higher than T g , and no SHG decay was observed below 175°C due to the partial main chain character of the polymer structure, which is acceptable for NLO device applications.

Wide-bandgap bipolar material with high thermal stability

2019 ◽  
pp. 903
Author(s):  
Sheng-Chieh Lin ◽  
Yu-Chieh Cheng ◽  
Man-Kit Leung ◽  
Jiun-Haw Lee ◽  
Tien-Lung Chiu
Keyword(s):  
Thermal Stability ◽  
Wide Bandgap ◽  
High Thermal Stability

New Deep Blue Emitting Materials Based on Indenopyrazine Core with High Thermal Stability

2011 ◽  
Vol 11 (5) ◽  
pp. 4639-4643 ◽  
Author(s):  
Chang-Hun Seok ◽  
Young-Il Park ◽  
Soo-Kang Kim ◽  
Ji-Hoon Lee ◽  
Jongwook Park
Keyword(s):  
Thermal Stability ◽  
High Thermal Stability ◽  
Deep Blue

scholarly journals Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

2019 ◽  
Vol 17 (1) ◽  
pp. 1080-1086
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Boric Acid ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
H Nmr ◽  
Maldi Tof ◽  
Instrumental Methods

AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

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