Camphorsulfonic Acid (camphorsulfonic + acid)

Distribution by Scientific Domains
Polymers and Materials Science85%

Selected Abstracts

Deracemization of a Macrocyclic 1,1,-Biisoquinoline

HELVETICA CHIMICA ACTA, Issue 5 2008
Gerald Dyker
Abstract The macrocyclic biisoquinoline 14 was synthesized in just four preparative steps starting from the simple biscarboxaldehyde 8. The interaction with camphorsulfonic acid induces an acid-catalyzed partial deracemization. [source]

Electrically Conducting Gels Formed From Polyaniline/Ethylcellulose/m -Cresol Ternary Solutions

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 10 2004
Ignacio González
Abstract Summary: Polyaniline doped with camphorsulfonic acid (PANI-CSA) and ethylcellulose (EC), constitutes the basis of the investigated binary PANI(CSA)0.5/m -cresol and ternary PANI(CSA)0.5/EC/m -cresol solutions. Ternary solutions give rise to gels with a lower elastic modulus and electrical conductivity than binary PANI(CSA)0.5/m -cresol gels. However, the dimensional stability is considerably improved, since warping observed in binary gels is eliminated or lessened. These results are explained considering the role played by ethylcellulose, which interacts with the hydroxyl group of m -cresol, skimping PANI(CSA)0.5/m -cresol specific interactions and retarding solvent evaporation. Electrical conductivity of binary (,) and ternary (,) gels as a function of m -cresol content. The arrow indicates that warping is observed below this solvent level. [source]

Nanoscaled Polyaniline Fibers Prepared by Ferric Chloride as an Oxidant

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 5 2006
Lijuan Zhang
Abstract Summary: Nanoscaled polyaniline (PANI) fibers with 17,30 nm in diameter were successfully prepared by oxidation polymerization using ferric hydrochloride (FeCl3,·,6H2O) as an oxidant in the presence of p -toluenesulfonic acid (p -TSA), , -naphthalenesulfonic acid (, -NSA), and camphorsulfonic acid (CSA) as the dopants. The resulting nanofibers show smaller diameter, higher crystallinity and conductivity (10,1 S,·,cm,1) compared with the nanofibers oxidized by ammonium persulfate (APS), which may be due to the lower oxidation/reduction potential of FeCl3. SEM images of the PANI nanofibers prepared by oxidation polymerization using ferric hydrochloride as an oxidant. [source]

Effects of interactions among polyaniline, camphorsulfonic acid and silica on the structure and properties of their conductive hybrids

POLYMER ENGINEERING & SCIENCE, Issue 3 2008
Hsun-Tsing Lee
In this work, the effects of interactions among polyaniline (PAn), camphorsulfonic acid (CSA), and silica on the structure and properties of their sol-gel hybrids are investigated. These interactions were revealed by FTIR, UV,vis spectra, and XRD patterns. The interaction between PAn and CSA raises conductivities of the CSA-doped PAn/SiO2 (c-PAn/SiO2) hybrids. Moreover, the hydrogen bonding interaction between c-PAn and silicic acid (precursor of SiO2) leads to a less degree of three-dimensional network structure of the SiO2 component in a hybrid with higher PAn content. In addition, because of the interactions among CSA, Pan, and SiO2, the conductive c-PAn-rich phase distributes uniformly in the hybrid and thermal resistance of the hybrid is enhanced consequently. Besides, the c-PAn/SiO2 hybrid with higher SiO2 content exhibits more significant blue-shift of its polaron band, lower conductivity, and higher thermal resistance. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers [source]

Columnar liquid-crystalline assemblies composed of spiropyran derivatives and sulfonic acids,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 10 2008
Boon-Hooi Tan
Abstract A series of fan-shaped spiropyran derivatives with different length of alkyl chains has been synthesized. Liquid-crystalline (LC) assemblies of spiropyran derivatives have been formed by the addition of organic sulfonic acids such as trifluoromethylsulfonic acid, 10-camphorsulfonic acid, 4-methylbenzenesulfonic acid, and imidazolium-based ionic liquids (ILs) having a sulfonic acid group. Equimolar mixtures of a fan-shaped spiropyran derivative with the acidic imidazolium-based ILs exhibit columnar phases with wider LC temperature ranges as compared to those of other mixtures. The ionic interactions formed by the ionic imidazolium moieties should contribute to the stabilization of the columnar phases. On the other hand, equimolar mixtures of the spiropyran derivative with decane-1-sulfonic acid having a long alkyl chain and poly(4-styrenesulfonic acid) do not show mesomorphism. The chemical structure of organic sulfonic acids is a key factor for the induction and stabilization of the LC phases. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Thermal stability study of conductive polyaniline/polyimide blend films on their conductivity and ESR measurement,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 5 2002
Moon Gyu Han
Abstract Conductivity stability at thermal environment of conductive polyaniline-complexes/polyimide (PANI-complexes/PI) blends, which were doped by camphorsulfonic acid (CSA) and dodecylbenzenesulfonic acid (DBSA), respectively, were investigated by conductivity measurements, electron spin resonance (ESR) spectra, differential and scanning thermometer (DSC). In the conversion process of PANI/Polyamic acid (PAA) to PANI/PI, the blend endeavored some kinds of alteration such as decomplexation of moisture and solvent, dissociation of dopant, crosslinking of PANI chain, and the imidization of PAA chain. PANI-DBSA/PI showed higher thermal stability of conductivity than PANI-CSA/PI, and both samples showed nearly linear decay of conductivity with increasing temperature showing greatly enhancement of conductivity stability. When they were exposed at near or over glass transition temperature, the conductivity decay became faster. The conductivity stability at base environment was also higher for PANI-DBSA/PI due to difficulty in accessing of hydroxyl ion to PANI, which were resulted from dopant. DBSA-doped blends showed increased polaron mobility and concentration at relatively high temperature, which led to extremely higher conductivity and its stability at high temperature. Copyright © 2002 John Wiley & Sons, Ltd. [source]