Synthesis and Characterization of Low Content of Structural Defects of Aryl-Substituted Electroluminescent Poly(p-phenylenevinylene)s

2001 ◽  
Vol 665 ◽  
Author(s):  
Zhi-Kuan Chen ◽  
Nancy Hoi Sim Lee ◽  
Wei Huang
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Defect Structure ◽  
Main Chain ◽  
Structural Defects ◽  
Synthesis And Characterization ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Polymer Main Chain

ABSTRACTWe report the synthesis and characterization of a novel series of aryl-substituted PPVs, which have shown excellent processability, good thermal stability, high photoluminescence quantum efficiency and low content of structural defects. The substituents of the polymers were designed with different degree of hindrance effect on the main chain. 1H NMR measurement indicates that the defect structure in the polymer main chain can be effectively depressed by introducing bulk and hindrance substituents.

Synthesis and Characterization of Novel Arylidene and Cardo Ester Bismaleimides and Poly(aminoaspartimide)s Therefrom

2003 ◽  
Vol 15 (3) ◽  
pp. 301-318 ◽  
Author(s):  
Vasile Cozan ◽  
Mitica Sava ◽  
Luminita Marin ◽  
Maria Bruma
Keyword(s):  
Thermal Stability ◽  
Liquid Crystalline ◽  
Polarized Light ◽  
Analysis Data ◽  
Synthesis And Characterization ◽  
Elemental Analysis Data ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
H Nmr

Six new bismaleimides (BMIs) having arylidene or cardo cycloaliphatic internal moieties were prepared by reacting 4-maleimidobenzoyl chloride with various arylidene or cardo bisphenols. The structures of BMIs were confirmed using elemental analysis data and spectroscopic (IR, 1H-NMR) characterizations. Two poly(aminoaspartimide)s (PAAs) were synthesized to exemplify one of the post-reaction abilities of the BMIs. Thermotropic liquid crystalline behavior was observed by differential scanning calorimetry and polarized light microscopy. The thermal stability of BMIs and PAAs was determined by thermogravimetric analysis and they showed good thermal stability except BMI 10, containing a cyclopentanone unit, which decomposed around 235°C. In this paper, we discuss the synthesis and characterization of these materials.

Synthesis and characterization of novel thermally stable poly(ether-amide)s containing dinaphthosulfone units in the main chain

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Abbas Shockravi ◽  
Shahram Mehdipour-Ataei ◽  
Shaghayegh Naghdi
Keyword(s):  
Thermal Stability ◽  
Main Chain ◽  
Aromatic Diamines ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Air Atmosphere ◽  
Sulfur Dichloride ◽  
New Type ◽  
Basic Hydrolysis

Abstract A New type of sulfone (4) containing 1,1´-thiobis(2- hydroxynaphthalene) diacid as a monomer was synthesized from the reaction of 2-hydroxynaphthalene (1) and sulfur dichloride, followed by reaction with methylchloroactate to obtain diester (2). Oxidation of this product in the presence of hydrogen peroxide followed by basic hydrolysis led to corresponding sulfone diacid (4) in good yield. Six organic-soluble poly(ether-amide)s bearing sulfone groups were synthesized via direct polycondensation of diacid (4) with commercially available aromatic diamines in the presence of calcium chloride as dehydrating agent. The resulting polyamides had inherent viscosity ranging from 0.38 to 0.46 dLg-1 at concentration of 0.5 gdL-1 in N,N-dimethylacetamide at 30 °C. The glass transition temperatures of these polyamides were recorded between 276-327 °C in air atmosphere. These polymers were also characterized by IR, 1H NMR and elemental analysis and their physical properties including viscosity, solubility properties, thermal stability and thermal behaviour were studied. These polyamides showed very good thermal stability and solubility in polar aprotic solvents.

Synthesis and Characterization of a Novel Hyperbranched Poly(Diethynylbenzene-Silane)

2012 ◽  
Vol 560-561 ◽  
pp. 174-178
Author(s):  
Yan Zou ◽  
Hui Min Qi ◽  
Mei Ling Xu ◽  
Fa Rong Huang ◽  
Lei Du
Keyword(s):  
Thermal Stability ◽  
Grignard Reagent ◽  
Synthesis And Characterization ◽  
Polycondensation Reaction ◽  
Degree Of Branching ◽  
H Nmr ◽  
Hyperbranched Poly ◽  
Ft Ir ◽  
Thermal Stability Of

Hyperbranched poly(diethynylbenzene-silane) (hb-PDEBS) was synthesized through polycondensation reaction of diethynylbenzene Grignard reagent (A2) and trichlorosilane (B3), and its structure was characterized by FT-IR, 1H-NMR, GPC and Elemental Analysis. The degree of branching of hb-PDEBS was defined by 29Si-NMR and calculated to be about 0.68. The curing behavior of hb-PDEBS was investigated by DSC. Thermal stability of cured hb-PDEBS was examined by TGA, and its residue at 1000°C under nitrogen was 80.6%. Hb-PDEBS displayed a strong absorption due to π-π* transition and exhibited the most intensity structured emission with a maximum around 500 nm.

Synthesis and Characterization of Polysulfonyldiphenylene Phenylphosphonate with High Melting Range

2011 ◽  
Vol 396-398 ◽  
pp. 2342-2345
Author(s):  
Zhong Wei Wang ◽  
Hao Dong Duan ◽  
Qing Yu
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Thermogravimetric Analysis ◽  
Synthesis And Characterization ◽  
Target Product ◽  
High Melting ◽  
Melting Range ◽  
Reaction Conditions ◽  
Good Thermal Stability

Polysulfonyldiphenylene phenylphosphonate (PSPPP) with high melting range of 197 to 205 °C was synthesized via molten polycondensation method. The effect of material ratio, reaction temperature and reaction time of the method was studied, and the preferred reaction conditions were obtained. The target product was characterized by FTIR and thermogravimetric analysis (TGA) was carried out to confirm the thermal stability. The PSPPP synthesized in this paper showed fairly good thermal stability.

Luminescent europium(iii) complexes based on tridentate isoquinoline ligands with extremely high quantum yield

2021 ◽  
Vol 8 (1) ◽  
pp. 41-47
Author(s):  
Zelun Cai ◽  
Chen Wei ◽  
Boxun Sun ◽  
Huibo Wei ◽  
Zhiwei Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Yield ◽  
Synthesis And Characterization ◽  
Excitation Wavelength ◽  
High Quantum Yield ◽  
Good Thermal Stability ◽  
High Quantum ◽  
Luminescence Efficiency

Synthesis and characterization of two new lanthanide Eu(iii) complexes based on tridentate isoquinoline ligands with high luminescence efficiency, extended excitation wavelength and good thermal stability.

Synthesis and characterization of aromatic poly(ether ketone amide)s

1993 ◽  
Vol 5 (3) ◽  
pp. 187-196 ◽  
Author(s):  
Frank W Mercer
Keyword(s):  
Thermal Stability ◽  
Benzoyl Chloride ◽  
Aprotic Solvent ◽  
Dielectric Constants ◽  
Synthesis And Characterization ◽  
Good Thermal Stability ◽  
Ether Ketone ◽  
T Values ◽  
General Method

A general method for the preparation of amide-containing aromatic polyether ketones has been developed. Polymerization is based on a ketone-activated halo displacement in amide-containing bis(4-fluorobenzoyl) moieties by phenoxides. N,N-Bis[4-(4-fluorobenzoyl)-(4-phenoxyphenylJ]terephthalamide and 4-[(4-fiuorobenzoyl)-(4-phenoxyphenylcarbamoyl)]-N-[(4-fluorobenzoyl)-(4-phenoxyphenyl)]phthalimide were prepared by reaction of 4-fluoro-benzoyl chloride with N,N.bis(4-phenoxyphenyl)terephthalamide and 4-(4.phenoxy-phenylcarbamoyl)-N-(4-phenoxyphenyl)phthalimide, respectively, in dichloromethane in the presence of aluminum chloride. Reaction of N,N-bis[4-(4-fluorobenzoyl)-(4-phenoxyphenyl)]-terephthalamide and 4-[(4-fluorobenzoyl(4-phenoxyphenylcarbamoyl)]-N-[(4-fluorobenzoyl)-(4-phenoxyphenyl)]phthalimide with diphenols in an aprotic solvent in the presence of potassium carbonate gave a series of aromatic poly(ether ketone amide)s. Films of the aromatic poly(ether ketone amide)s displayed good thermal stability, flexibility, and T, values ranging from 134 to 186 CC. The dielectric constants of the films were characterized as a function of relative humidity (RH).

Synthesis and characterization of new phenanthrolinetriether copolymers with rotaxane architecture

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Aurica Farcas ◽  
Valeria Harabagiu
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ethylene Glycol ◽  
Synthesis And Characterization ◽  
Nmr Analysis ◽  
H Nmr ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Different Content

AbstractThis paper is devoted to the preparation and characterization of new phenanthroline-triether copolymers with rotaxane architecture by reaction of complexes of α- or β- cyclodextrin and tri(ethylene glycol) ditosylate with 2,9-di(4-hydroxyphenyl)-1,10- phenanthroline, which is large enough to prevent dethreading of cyclodextrin molecules. Comparative 1H-NMR analysis of tri(ethylene glycol) ditosylate complexes and of rotaxane copolymers evidenced the lower cyclodextrin content in rotaxane copolymers as compared to the calculated values. The rotaxane copolymers present bimodal molecular weight distributions attributed to the separation of the fractions with different content of cyclodextrin threaded on the copolymer chain. As evidenced by thermogravimetric analysis, the rotaxane copolymers show higher thermal stability than its non-complexed homologue.

Synthesis and characterization of novel optically active poly(ester-imide)s with highTgand good thermal stability

2013 ◽  
Vol 24 (9) ◽  
pp. 807-813 ◽  
Author(s):  
Tao Han ◽  
Yi Zhang ◽  
Qiaoying Cao ◽  
Siwei Liu ◽  
Zhenguo Chi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Good Thermal Stability

Synthesis and characterization of aromatic poly(ether ketone oxadiazole)s

1993 ◽  
Vol 5 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Frank W Mercer
Keyword(s):  
Thermal Stability ◽  
Relative Humidity ◽  
Aprotic Solvent ◽  
Dielectric Constants ◽  
Aluminium Chloride ◽  
Synthesis And Characterization ◽  
Good Thermal Stability ◽  
Ether Ketone ◽  
General Method

A general method for the preparation of oxadiazole containing aromatic poly(ether ketone)s has been developed. Polymerization is based on a ketone-activated halo displacement in oxadiazole containing bis(4-fluorobenzoyl) moieties by phenoxides. 2,5-bis[4-(4-fluorobenzoyl-(4-phenoxyphenyl)]-1,3,4-oxadiazole was prepared by reaction of 4-fluorobenzoyl chloride with 2,5-bis(4-phenoxyphenyl)-1,3,4-oxadiazole in dichloromethane in the presence of aluminium chloride. Reaction of 2,5-bis[4-(4-fiuorobenzoyl)-(4-phenoxyphenyl)]-1,3,4-oxadiazole with diphenols in an aprotic solvent in the presence of potassium carbonate gave a series of aromatic poly(ether ketone oxadiazole)s. Films of the aromatic poly(ether ketone oxadiazole)s displayed good thermal stability, flexibility, and Ts s ranging from 172 to 218 C. The dielectric constants of the films were characterized as a function of relative humidity (RH).

Synthesis and Characterization of Multi-Functional Substituted POSS

2012 ◽  
Vol 554-556 ◽  
pp. 227-230
Author(s):  
Li Ying Zhang ◽  
Xiao Jing Zhao ◽  
Ping Chen ◽  
Sheng Di Fan
Keyword(s):  
Thermal Stability ◽  
Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Thermal Stability ◽  
Elementary Analysis ◽  
Thermal Stability Of

Five different multifunctional nitro octaphenyl silsesquioxane (NPS) were Synthesised and reduction was carried out to obtain amino octaphenyl silsesquioxane(APS). These compounds were characterized with elementary analysis, fourier transform infrared(FTIR), nuclear magnetic resonance (NMR, 29Si), wide-angle X-ray diffraction(XRD) and thermogravimetry (TG). Experiental results showed that the longer the nitration time, the more nitro connected to the OPS, but not positively, nitro number remained unchanged after five hours. NPS has good thermal stability than corresponding APS under 450°C, and the thermal stability of APS are decrease with the increase of amino number.

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