The Experts below are selected from a list of 11298 Experts worldwide ranked by ideXlab platform
Frank Cheng-yu Wang - One of the best experts on this subject based on the ideXlab platform.
-
Polymer additive analysis by Pyrolysis-Gas Chromatography. IV. Antioxidants.
Journal of chromatography. A, 2000Co-Authors: Frank Cheng-yu WangAbstract:Antioxidants are important additives in polymers. Because of the low level of antioxidants normally used, they cannot be analyzed directly by common spectroscopic or thermal chemical techniques. However, antioxidants as well as other additives in polymers can be qualitatively analyzed by Pyrolysis-Gas Chromatography (Py-GC) after separating the polymers and additives. In this study, several antioxidants have been investigated to demonstrate that Py-GC is a viable tool to analyze them. The advantages of using Py-GC in the analysis of antioxidants have also been discussed.
-
Characterization of a Polymeric Chain by Pyrolysis Gas Chromatography and Computer Simulation
Macromolecules, 2000Co-Authors: Frank Cheng-yu WangAbstract:A method has been developed which utilizes the experimental results from Pyrolysis−Gas Chromatography (Py−GC) integrated with that from a Monte Carlo simulation to characterize the microstructure o...
-
Polymer analysis by Pyrolysis Gas Chromatography
Journal of Chromatography A, 1999Co-Authors: Frank Cheng-yu WangAbstract:Abstract Pyrolysis Gas Chromatography (Py–GC) has been an important technique in the qualitative and quantitative analysis of polymers for more than thirty years. Recent developments in Py–GC technology are mainly focused on Pyrolysis operation and applications. In the former category, the focus is on the development of flexible Pyrolysis instrumentation, “pre-” and “post-” Pyrolysis derivatization and database creation/maintenance. In the application field, the development focused on kinetics of thermal degradation, structure determination and integrate techniques associated with Pyrolysis to perform qualitative and quantitative analysis of low level additives in polymers.
-
Composition and Microstructure Determination of a Latex System by Pyrolysis Gas Chromatography
Analytical Chemistry, 1999Co-Authors: Frank Cheng-yu WangAbstract:The composition and microstructure of polymers in a latex system have been studied by Pyrolysis Gas Chromatography (Py-GC). Traditionally, when latex systems have been analyzed, all polymeric mater...
-
Composition and Microstructure Analysis of Chlorinated Polyethylene by Pyrolysis Gas Chromatography and Pyrolysis Gas Chromatography/Mass Spectrometry
Analytical Chemistry, 1997Co-Authors: Frank Cheng-yu Wang, Patrick B. SmithAbstract:A Pyrolysis Gas Chromatography method was developed to determine the composition and microstructure of chlorinated polyethylene (CPE). This method utilized specific aromatic compounds which were formed through dehydrochlorination of trimers after Pyrolysis of CPE polymers at elevated temperatures. The composition and microstructure calculation was based on the difference between the levels of ethylene and vinyl chloride trimers formed. This method is valid for CPE polymers containing between 25 and 48 wt % chlorine. The composition of CPE polymers used in this study was corroborated with 13C-NMR results and the manufacturer's product specification.
Tetsuo Miyakoshi - One of the best experts on this subject based on the ideXlab platform.
-
Identification of Ryukyu lacquerware by Pyrolysis–Gas Chromatography/mass spectrometry
Journal of Analytical and Applied Pyrolysis, 2007Co-Authors: Yukio Kamiya, Takayuki Honda, Yoshimi Kamiya, Aki Okamoto, Tetsuo MiyakoshiAbstract:Abstract Six kinds of Ryukyu lacquerwares were analyzed using Pyrolysis–Gas Chromatography/mass spectrometry to determine the identity of the lacquer source. 3-Heptylcatechol (MW = 208) and 3-heptylphenol (MW = 192) due to the Pyrolysis product of urushiol were detected in four kinds of lacquer pieces. In the other two lacquer pieces, 3-nonylcatechol (MW = 236) and 3-nonylphenol (MW = 220) were obtained due to the Pyrolysis of laccol, suggesting that the Ryukyu lacquerware was made from Rhus vernicifera and Rhus succedanea , respectively. In addition, the conservation and restoration of valuable ancient lacquerware also is discussed.
-
identification of ryukyu lacquerware by Pyrolysis Gas Chromatography mass spectrometry
Journal of Analytical and Applied Pyrolysis, 2007Co-Authors: Yukio Kamiya, Takayuki Honda, Yoshimi Kamiya, Aki Okamoto, Tetsuo MiyakoshiAbstract:Abstract Six kinds of Ryukyu lacquerwares were analyzed using Pyrolysis–Gas Chromatography/mass spectrometry to determine the identity of the lacquer source. 3-Heptylcatechol (MW = 208) and 3-heptylphenol (MW = 192) due to the Pyrolysis product of urushiol were detected in four kinds of lacquer pieces. In the other two lacquer pieces, 3-nonylcatechol (MW = 236) and 3-nonylphenol (MW = 220) were obtained due to the Pyrolysis of laccol, suggesting that the Ryukyu lacquerware was made from Rhus vernicifera and Rhus succedanea , respectively. In addition, the conservation and restoration of valuable ancient lacquerware also is discussed.
Inger Ericsson - One of the best experts on this subject based on the ideXlab platform.
-
Studies of the thermal degradation of polysulfones by filament-pulse Pyrolysis—Gas Chromatography
Polymer Degradation and Stability, 1995Co-Authors: Per Almén, Inger EricssonAbstract:Abstract The thermal degradation of poly(1,4-phenylene ether—sulfone) (PES), Mw 47000, and of a polysulfone resin (PSR) Mw 75000, was studied by flash-Pyrolysis, with a temperature rise time (TRT) of 8 ms. Pyrolysis products were monitored by a Pyrolysis-Gas Chromatography flame ionisation detector/flame photometric detector (Py-GC-FID/FPD) and Pyrolysis-Gas Chromatography mass spectrometry (Py-GC/MS). Special attention was given to the formation of sulphur-containing Pyrolysis products. The kinetics of SO2 formation were studied by sequential Pyrolysis of PES and PSR. It was possible to differentiate between the rates of formation of SO2 from PES and PSR. The rate of formation of SO2 was somewhat higher for PES than for PSR. The activation energies were 270 and 280 kJ/mol, respectively, and the frequency factors were 1014 and 1015s−1.
G. Czira - One of the best experts on this subject based on the ideXlab platform.
-
Thermal degradation of furfuraldehyde resins. Pyrolysis-Gas Chromatography-mass spectrometry and fourier transform infrared
European Polymer Journal, 2003Co-Authors: R. Sánchez, C. Hernández, G. Jalsovszky, G. CziraAbstract:Abstract Flash-pyrolyses of two furfuraldehyde resins were performed at 980 and 770°. The identities of volatile products were established by employing two coupled systems, viz. Pyrolysis-(Gas Chromatography)-(mass spectrometry) in electron-impact and chemical-ionization modes and Pyrolysis-(Gas Chromatography)-(fourier transform infrared spectroscopy).
Yukio Kamiya - One of the best experts on this subject based on the ideXlab platform.
-
Identification of Ryukyu lacquerware by Pyrolysis–Gas Chromatography/mass spectrometry
Journal of Analytical and Applied Pyrolysis, 2007Co-Authors: Yukio Kamiya, Takayuki Honda, Yoshimi Kamiya, Aki Okamoto, Tetsuo MiyakoshiAbstract:Abstract Six kinds of Ryukyu lacquerwares were analyzed using Pyrolysis–Gas Chromatography/mass spectrometry to determine the identity of the lacquer source. 3-Heptylcatechol (MW = 208) and 3-heptylphenol (MW = 192) due to the Pyrolysis product of urushiol were detected in four kinds of lacquer pieces. In the other two lacquer pieces, 3-nonylcatechol (MW = 236) and 3-nonylphenol (MW = 220) were obtained due to the Pyrolysis of laccol, suggesting that the Ryukyu lacquerware was made from Rhus vernicifera and Rhus succedanea , respectively. In addition, the conservation and restoration of valuable ancient lacquerware also is discussed.
-
identification of ryukyu lacquerware by Pyrolysis Gas Chromatography mass spectrometry
Journal of Analytical and Applied Pyrolysis, 2007Co-Authors: Yukio Kamiya, Takayuki Honda, Yoshimi Kamiya, Aki Okamoto, Tetsuo MiyakoshiAbstract:Abstract Six kinds of Ryukyu lacquerwares were analyzed using Pyrolysis–Gas Chromatography/mass spectrometry to determine the identity of the lacquer source. 3-Heptylcatechol (MW = 208) and 3-heptylphenol (MW = 192) due to the Pyrolysis product of urushiol were detected in four kinds of lacquer pieces. In the other two lacquer pieces, 3-nonylcatechol (MW = 236) and 3-nonylphenol (MW = 220) were obtained due to the Pyrolysis of laccol, suggesting that the Ryukyu lacquerware was made from Rhus vernicifera and Rhus succedanea , respectively. In addition, the conservation and restoration of valuable ancient lacquerware also is discussed.
