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).

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.

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

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.

scholarly journals Colorless Semi-Alicyclic Copolyimides with High Thermal Stability and Solubility

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1319 ◽  
Author(s):  
Zhongxu Lan ◽  
Chunyu Li ◽  
Yanlei Yu ◽  
Jia Wei
Keyword(s):  
Thermal Stability ◽  
Decomposition Temperature ◽  
High Thermal Stability ◽  
Thermal Decomposition Temperature ◽  
One Pot ◽  
Plastic Substrates ◽  
Good Solubility ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer ◽  
Solution Polycondensation

A series of colorless copolyimide films with high thermal stability and good solubility are synthesized from (trifluoromethyl)biphenyl-4,4’-diamine (TFMB) with different 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA) to 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane (6FDA) dianhydride mole ratios through one-pot solution polycondensation. These copolyimide films exhibit excellent optical transparency (T400 > 90% and λ0 ~305–333 nm) with a thickness of 15 μm and good solubility in most organic solvents. The excellent optical properties are mainly attributed to the low inter- and intra-molecular charge transfer interactions due to the alicyclic structure and the strong electronegative CF3 groups. The glass transition temperature increases from 332 to 352 °C with increasing HPMDA content in the copolymers, while the thermal decomposition temperature is improved with increasing 6FDA content. These results indicate that the copolyimide films can be successfully utilized in the development of novel heat-resistant plastic substrates for the optoelectronic engineering applications.

scholarly journals Synthesis and electro-optical properties of fluorene containing blue luminescent rod-coil homopolymers with pendant pyridine

2017 ◽  
Vol 35 (1) ◽  
pp. 217-224
Author(s):  
Duryodhan Sahu ◽  
Subhendu Chakroborty
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Average Molecular Weight ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Decomposition Temperature ◽  
High Thermal Stability ◽  
Photoluminescence Spectra ◽  
Fluorescence Emission Spectra ◽  
Good Solubility

AbstractTwo well defined, blue luminescent homopolymers containing 9,9-diethylfluorene core with electron withdrawing pendant pyridine, Suzuki-coupled with the corresponding borolane of decoxy phenyl (PFPA) and naphthalene (PFNA) have been designed and synthesized efficiently. The obtained rod-coil polymers have the average molecular weight of 15212 (PFPA) and 15130 (PFNA) with polydispersity indices (PDIs) 1.07 and 1.3, respectively. The polymers have good solubility and high thermal stability with the decomposition temperature of 362 °C (PFPA) and 367 °C (PFNA) correspondingly. Furthermore the optical and electrochemical properties of the polymers have been investigated. The polymers exhibited photoluminescence (PL) maxima at 410 nm (PFPA) and 414 nm (PFNA) excited at 340 nm, as stable blue luminescence polymers at low concentration of 10−6 M with a quantum yield of 0.64 and 0.62, respectively. In addition the annealed (150 °C) polymer films showed better stability of its photoluminescence spectra. Absorbance and fluorescence emission spectra of PFPA and PFNA were compared in order to evaluate the effects of substituent, phenyl and naphthalene in pyridine pendant fluorene moieties.

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.

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