Relevant bibliographies by topics / Gel permeation chromatography (GPC)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Gel permeation chromatography (GPC)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Gel permeation chromatography (GPC)"

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Weisskopf, Klaus. "Characterization of polyethylene terephthalate by gel permeation chromatography (GPC)." Journal of Polymer Science Part A: Polymer Chemistry 26, no. 7 (July 1988): 1919–35. http://dx.doi.org/10.1002/pola.1988.080260718.

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Milana, M. R., M. Denaro, L. Arrivabene, A. Maggio, and L. Gramiccioni. "Gel permeation chromatography (GPC) of repeatedly extruded polyethylene terephthalate (PET)∗." Food Additives and Contaminants 15, no. 3 (April 1998): 355–61. http://dx.doi.org/10.1080/02652039809374651.

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Ouano, A. C. "Gel permeation chromatography VII. Molecular weight detection of gpc effluents." Journal of Polymer Science: Polymer Symposia 43, no. 1 (March 8, 2007): 299–310. http://dx.doi.org/10.1002/polc.5070430126.

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Daft, James, Marvin Hopper, Darrell Hensley, and Ronald Sisk. "A Displacement Pump Procedure to Load Extracts for Automated Gel Permeation Chromatography." Journal of AOAC INTERNATIONAL 73, no. 6 (November 1, 1990): 992–94. http://dx.doi.org/10.1093/jaoac/73.6.992.

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Abstract Automated gel permeation chromatography (GPC) effectively separates lipids from pesticides In sample extracts that contain fat. Using a large syringe to load sample extracts manually onto GPC models having 5 mL holding loops is awkward, slow, and potentially hazardous. Loading with a small-volume displacement pump, however, Is convenient and fast (ca 1 loop every 20 s). And more Importantly, the analyst is not exposed to toxic organic vapors because the loading pump and Its connecting lines do not leak in the way that a syringe does.
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Gu, Qiang, Xiaojuan Yi, Jinling Shen, Jing Shi, Yijun Liu, and Jingdong Shao. "A highly automated method for simultaneous determination of sterols, erythrodiol and uvaol in olive oils." Analytical Methods 8, no. 20 (2016): 4022–27. http://dx.doi.org/10.1039/c6ay00357e.

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In this work, we presented a highly automated method for the simultaneous analysis of sterols, erythrodiol and uvaol in olive oils with the use of gel permeation chromatography (GPC), an automatic solvent evaporator and LC-MS.
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Furusawa, Naoto, Kunio Okazaki, Sachiko Iriguchi, Hidemasa Yamaguchi, and Minoru Saitoh. "Gel Permeation and Florisil Chromatographic Cleanup and Gas Chromatographic Determination of Organochlorine Pesticides in Eggs." Journal of AOAC INTERNATIONAL 81, no. 5 (September 1, 1998): 1033–36. http://dx.doi.org/10.1093/jaoac/81.5.1033.

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Abstract Cleanup of residual organochlorine pesticides (OCPs; α-, β-, γ-, and δ-BHC; aldrin; dieldrin; p,p′-DDE; o,p′-DDT; p,p′-DDD; and p,p′-DUX) in eggs by gel permeation chromatography (GPC) and Florisil minicolumn chromatography is described. Ten OCPs in purified extract are determined by gas chromatography with electron capture detection. The lipids extracted from whole egg are cleaned up first by GPC with an Envirogel column and an ethyl acetate-cychlohexane (1 + 1, v/v) mobile phase and then by Florisil minicolumn chromatography with 15% (v/v) diethyl ether-hexane eluant. Cleanup is highly efficient. Average recoveries of 10 spiked OCPs (0.0025-0.0125 ppm) ranged from 81 to 101%, with coefficients of variation between 1 and 14%. The detection limit was 0.001 ppm for the 10 OCPs
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Shen, Teng Fei, and Ying Juan Sun. "Preparation and Characterization of Novel Bipolar Copolymers Based on Quinoline Aluminum and Carbazole." Advanced Materials Research 785-786 (September 2013): 656–59. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.656.

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In this work, a series of novel bipolar copolymers containing 8-hydroxyquinoline aluminum (Alq3) and carbazole had been synthesized by copolymerization of a novel Alq3 complex monomer and N-vinylcarbazole (NVK), and characterized by Fourier transform infrared spectra (FTIR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC).
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Maziarz, E. Peter, and X. Michael Liu. "A Modified Thermal Deposition Unit for Gel-Permeation Chromatography with Matrix-Assisted Laser Desorption/Ionization and Electrospray Ionization Time-of-Flight Analysis." European Journal of Mass Spectrometry 8, no. 5 (October 2002): 397–401. http://dx.doi.org/10.1255/ejms.500.

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We describe a modified commercially available thermal deposition unit that incorporates a post-column mixing cell for gel-permeation chromatography (GPC) effluent and matrix solution prior to continuous deposition onto a matrix-assisted laser desorption/ionization (MALDI) sample target. This modification overcomes the shortcomings of using a prefabricated matrix foil. This GPC MALDI method with time-of-flight (ToF) mass spectrometry is demonstrated by the analysis of a poly(dimethylsiloxane) (PDMS) sample used in the production of implantable device materials.
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Shen, Jiang Nan, Yun Fei Ye, Gan Ning Zeng, and Jun Hong Qiu. "Preparation and Characterization of PMMA-b-PDMAEMA/Polysulfone Composite Membranes by RAFT Polymerization and their Permeation Performance of Carbon Dioxide." Advanced Materials Research 284-286 (July 2011): 1717–23. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.1717.

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PMMA-b-PDMAEMA/polysulfone composite membranes for CO2separation was prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization techniques. The chemical composition and structure of the polymers were characterized by Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), and molecular weight and its distribution were measured by Gel permeation chromatography (GPC). CO2permeation performance of the PMMA-b-PDMAEMA/ polysulfone composite membranes was test. The results showed that the resulted composited membrane posses good permeation performance for CO2.
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DOBKOWSKI, ZBIGNIEW. "A procedure for molecular characteristics of polymers by gel permeation chromatography (GPC)." Polimery 37, no. 04 (April 1992): 146–51. http://dx.doi.org/10.14314/polimery.1992.146.

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Dissertations / Theses on the topic "Gel permeation chromatography (GPC)"

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Al-Harbi, Nasser Munawir D. "Characterisation of complex polymer mixtures." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-complex-polymer-mixtures(be0269fe-2ac3-4128-ba57-4a03dbf46a7e).html.

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The polymer of intrinsic microporosity PIM-1 was synthesized following various procedures: (i) from fluoro-monomer by the conventional method, (ii) from fluoro-monomer by a high temperature, high shear mixing method and (iii) from chloro-monomer. For a more complete understanding of the structure of the resultant products of a series of polymerizations under different reaction conditions, a multi-detector gel permeation chromatography (GPC) method was established and validated. A procedure for fractionating PIM-1 using chloroform methanol solvent mixtures was established and validated. A combination of multi-detector GPC and matrix-assisted laser desorption/ionization-time of flight (MALDI-ToF) masss pectrometry was used for the determination of molar mass distribution and to identify structural differences between fractions and between the products from different synthetic procedures. High molar mass samples tended to have broader molar mass distributions. Both Mark-Houwink plots and hydrodynamic volume plots showed deviation from linearity at Mw= 200000 g mol-1, which was attributed to branching. A low cost route for the preparation of PIM-1 from chloro-monomer was successfully established, though samples prepared by this route had broader polydispersities than those prepared from fluoro-monomers. It was found that stable flexible membranes were formed from samples with Mw > 83000 g mol -1. In addition, a comparison of two analytical methods for extraction and determination of additives in HDPE, LLDPE and PP polymers of interest to Saudi Basic Industries Corporation was performed. A comparison of dissolution with ultrasonic assisted extraction methods for the determination of anti-oxidant additives in polyolefins was performed. Ultrasound assisted extraction methods were found to be superior for HDPE and LLDPE, where conventional dissolution was preferred for PP.
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Stehlík, Pavel. "Stanovení vybraných strobilurinových pesticidů v ječmeni, sladu a pivu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216412.

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This diploma work is aimed determination of strobilurine pesticide in barly, malt and berr. Identifikation of strobilurine was made according to mass spectra library and base of commercialy standard. The next quantifikation in samples was made. The work consist of three main parts refer about problems. In therotical part is the method of plant, grown protection. This part is about pesticides and their fission, history and effects. In experimental part is method for determination strobilurine. In part results and discussion are all result and data in tables a graphs. At the end is sumed up result this work.
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Gustavsson, Per-Erik. "Superporous agarose a new material for chromatography /." Lund : University of Lund, 1998. http://books.google.com/books?id=ButqAAAAMAAJ.

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Li, Zhiguo. "High-performance liquid chromatography analysis of fatty acids and mathematical modeling of liquid chromatography." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1179157379.

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Chen, Yu-Jen. "The solubility enhancement and the stability assessment of rifampicin, isoniazid and pyrazinamide in aqueous media." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005009.

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Tuberculosis (TB) is a highly contagious disease caused by the bacterium known as Mycobacterium tuberculosis which is widely spread in South Africa, especially in the rural areas of the Western Province. Rifampicin, isoniazid and pyrazinamide are the three most effective drugs against this organism. However, most of the current commercial anti-TB formulations are inconvenient to administrate. This results in patient non-compliance which has increased with incomplete tuberculosis treatment and further has intensified the mortality rate. The matter is especially severe amongst the paediatric and geriatric patients. Therefore, creating a "user-friendly" but non-alcoholic liquid formulation should improve the whole situation. The key to a successful formulation relies on sufficient concentrations of the drugs within the formulation together with acceptable stability of these drugs. Therefore, during the pre-formulation stage, the solubility and stability studies of rifampicin, isoniazid and pyrazinamide are to be conducted. Rifampicin, isoniazid and pyrazinamide were fully characterized and identified by means of spectroscopic and thermal techniques. A HPLC method for simultaneous analysis of the three drugs was developed and validated. This HPLC method was employed for all the solubility and stability assessments. Unbuffered HPLC water of pH value 7.01 was chosen as the aqueous solvent. This was decided after the stability of rifampicin, isoniazid and pyrazinamide was studied at a pH range of 2 to 10. The solubility and the stability studies of rifampicin, isoniazid, pyrazinamide, rifampicin with isoniazid, rifampicin with pyrazinamide, isoniazid with pyrazinamide and rifampicin combined with both isoniazid and pyrazinamide were performed in the presence of various agents. These agents can be categorized into three groups: the surfactants (poloxamer 188, poloxamer 407 and sorbitol) which could increase the intrinsic solubility or the drugs by altering the surface tensions of the aqueous solution medium, the suspending agents (carbopol 934 and carbopol 974P) which could enable the amount of dosage required to be homogeneously suspended in the formulation without considering the low intrinsic solubility factor of the drugs, and the complexing agents (ß-cyclodextrin, hydroxypropyl-ß-cyclodextrin and -cyclodextrin) which could initiated the inclusion complex between the host cyclodextrin and the drugs, thus further enhance the solubility of the drugs . The stability assessments were performed after 7-days stability trail with the HPLC method developed. Each drug/combination of drugs were stored in closed ampoules and subjected to 25, 40 and 60° C with or without nitrogen flushing while in the presence of the above mentioned agents. While assessing the solubility/stability of the drugs in the presence of the above mentioned surfactants, the phase-solubility curves indicate that both rifampicin and pyrazinamide fail to achieve the desired concentration. Moreover, the stability-time plots clearly indicate that these surfactants fail to enhance the general stabilities of the drugs. When the stabilizing effects of the above mentioned suspending agents were investigated, it was found that although the desired concentration could be easily accomplished by suspending the drug in the aqueous carbopol solutions, the stabilities of the different drug combinations were still below the regulatory level. Cyclodextrins are well known to form inclusion complexes with less polar drug molecules. The inclusion complexation could enhance both the solubility and the stability of the included drug molecules. The computer force field generated models of the cyclodextrin-drug were used to predict the complexation sites. The results indicated the all the inclusion complexation between the drugs and the cyclodextrins were favourable, but do not necessary protect the potential degradation sites of the drugs. The stability results confirmed the above findings as the cyclodextrins did not enhance the stability of the drugs. Various drug-drug interaction pathways were also predicted from the experimental observations which clearly indicated the stability reductions of these drugs in combination. This leads to the conclusion that a liquid formulation combining rifampicin, isoniazid and pyrazinamide should not initiate the use of aqueous solutions as the protic ions of the solution are able to initiate the degradation of these drugs.
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Miller, Keith Edward. "Dynamic surface tension detector in flow injection analysis and liquid chromatography /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/8506.

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Ring, Ludwig. "Purification of psychoactive biomolecules in plants using size exclusion chromatography." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18434.

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Size exclusion chromatography (SEC) was applied for purification of psychoactive biomolecules from plants. These molecules are in the same molecular weight range, but do not necessarily share other chemical properties, that makes the SEC technique efficient. By applying SEC as a first purification step much of the co-extractives from the plants can easily be removed. Large amounts of target substance can be obtained with little effort if the system is automated. Combining SEC with a second purification step, consisting of normal phase chromatography, provides high purity of the target substance.

Both known and unknown psychoactive biomolecules can easily be purified using the purification method developed in this Master's Thesis. Purifications that previously required long time and much "hands-on" can be completed much faster and with less manual work.

The method developed was tested on cannabis, coffee and 'Spice' with good results.

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Thomas, Sydney. "Measurement and modelling of long chain branching in chain growth polymerization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ42769.pdf.

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Heldreth, Lori G. "The evaluation of crosslinked poly-4-vinylpyridine as a packing material for size exclusion chromatography." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/44471.

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Crosslinked poly-4-vinylpyridine (XPVP) has not previously been used as a size exclusion chromatographic packing material. This material appears attractive for the analysis of nitrogen containing polymers because of its basic nitrogen functionality, and desirable physical properties. Its use as such is investigated with probe compounds in several different mobile phases. Various methods of separation of the XPVP material by particle size are employed. In addition, four column packing techniques were examined.
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Braddy, April C. "Increased-throughput screening of potential drug candidates for permeation across membranes and estimation of central nervous system bioavailability." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008420.

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Thesis (Ph.D.)--University of Florida, 2004.
Typescript. Title from title page of source document. Document formatted into pages; contains 167 pages. Includes Vita. Includes bibliographical references.
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Books on the topic "Gel permeation chromatography (GPC)"

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Hans, Henke. Preparative gel chromatography on Sephadex LH-20. Heidelberg: Hüthig, 1995.

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Haddon, Margaret Ruth. Gel permeation chromatography standards and model polyethylene compounds. Birmingham: University of Birmingham, 1989.

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1967-, Striegel André M., American Chemical Society. Division of Analytical Chemistry, American Chemical Society. Division of Polymer Chemistry, American Chemical Society. Division of Polymeric Materials: Science and Engineering, and American Chemical Society Meeting, eds. Multiple detection in size-exclusion chromatography. Washington, DC: American Chemical Society, 2004.

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Sadao, Mori. Size exclusion chromatography. Berlin: Springer, 1999.

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Szewczyk, Paweł. Badania nad oznaczaniem zależności między objętością retencji w chromatografii żelowej a masą cząsteczkową polimerów. Kraków: Uniwersytet Jagielloński, 1987.

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V, Mchedlishvili B., and Saminskiĭ E. M, eds. Khromatografii͡a︡ biopolimerov na makroporistykh kremnezemakh. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1986.

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Linehan, J. Characterization of the coal biosolubilization process using gel permeation chromatography and CPMAS NMR. S.l: s.n, 1990.

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Spurs, I. C. Utilization of gel permeation chromatography in the monitoring of pesticide residues in food. Wolverhampton: University of Wolverhampton, 1994.

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Dupont, Anne-Laurence. Gelatine sizing of paper and its impact on the degradation of cellulose during aging: A study using size-exclusion chromatography. Amsterdam: Universiteit van Amsterdam, 2003.

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J, Hunt B., and Holding S. R, eds. Size exclusion chromatography. Glasgow: Blackie, 1989.

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Book chapters on the topic "Gel permeation chromatography (GPC)"

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Burgess, Helen D. "Gel Permeation Chromatography." In Historic Textile and Paper Materials, 363–76. Washington, DC: American Chemical Society, 1986. http://dx.doi.org/10.1021/ba-1986-0212.ch020.

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Gooch, Jan W. "Gel-Permeation Chromatography." In Encyclopedic Dictionary of Polymers, 338–39. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5472.

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Yang, Rui. "Gel Permeation Chromatography." In Analytical Methods for Polymer Characterization, 79–110. Boca Raton : CRC Press, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/9781351213158-3.

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Gellerstedt, G. "Gel Permeation Chromatography." In Methods in Lignin Chemistry, 487–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-74065-7_34.

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Ekmanis, Juris L. "Preparative Gel Permeation Chromatography." In Detection and Data Analysis in Size Exclusion Chromatography, 47–58. Washington, DC: American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0352.ch003.

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Kuo, C., Theodore Provder, and M. E. Koehler. "Gel Permeation Chromatography—Viscometry." In ACS Symposium Series, 231–42. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0521.ch015.

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Cao, Yan-Zhong, Yong-Ming Liu, Na Wang, Xin-Xin Ji, Cui-Cui Yao, Xiang Li, Li-Li Shi, Qiao-Ying Chang, Chun-Lin Fan, and Guo-Fang Pang. "Multiresidual Determination of 295 Pesticides and Chemical Pollutants in Animal Fat by Gel Permeation Chromatography (GPC) Cleanup Coupled with GC-MS/MS, GC-NCI-MS, and LC-MS/MS." In High-Throughput Analysis for Food Safety, 117–66. Hoboken, New Jersey: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118907924.ch05.

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Meira, Gregorio R., Jorge R. Vega, and Mariana M. Yossen. "Gel Permeation and Size Exclusion Chromatography." In Ewing’s Analytical Instrumentation Handbook, Fourth Edition, 735–76. Fourth edition / [edited by] Nelu Grinberg, Sonia Rodriguez. | Boca Raton : CRC Press, Taylor & Francis Group, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/9781315118024-26.

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Lesec, James, Michèle Millequant, Maryse Patin, and Philippe Teyssie. "Star-Branched Polymers in Multidetection Gel Permeation Chromatography." In Advances in Chemistry, 167–79. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/ba-1995-0247.ch013.

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Goldwasser, Judah M. "Absolute MnDetermined by Gel Permeation Chromatography—Differential Viscometry." In ACS Symposium Series, 243–51. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0521.ch016.

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Conference papers on the topic "Gel permeation chromatography (GPC)"

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Zhong, Sijia, Jianfeng Shi, Weican Guo, and Jinyang Zheng. "Investigation on the Allowable Temperature During Electrofusion Welding of Polyethylene Pipe." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78671.

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Polyethylene (PE) pipe material may degrade into lower carbon number volatiles quickly during the electrofusion welding process when the welding temperature rises up to more than about 370°C. Meanwhile, PE may also degrade into lower molecular weight (MW) polymer when subject to a lower temperature. As a result, the allowable temperature during electrofusion welding is uncertain. In this paper, a typical PE100 material was chosen to conduct thermogravimetic analysis (TGA) and Gel permeation chromatography (GPC) test. The thermal degradation behavior of PE100 was investigated in Dynamic and isothermal mode. And the composition of the thermal degradation residue was determined through MW and molecular weight distribution (MWD) measurements of the residue. Based on the experimental results, the initial temperature of thermal degradation with volatilization was derived and the thermal degradation process was studied in detail. To limit the thermal degradation degree of PE in a required range in thermal welding process, the preliminary allowable welding temperature for typical commercial PE100 material was determined. In addition, some regular information was obtained, which could promote the ultimate determination of the allowable welding temperature.
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Knight, Colette C., James C. Carnahan, Kevin Janora, and John F. Ackerman. "Jet Fuel Oxidation and Deposition." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-183.

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The chemistry leading to homogeneous deposit formation when Jet A fuel is heated between 170–300°C was investigated by characterizing both the deposits and changes in the fuel after deposit formation. The maximum amount of deposits that form from static Jet A fuel heated at 200°C with a continuous airflow is ∼5 wt. % indicating the presence of a finite concentration of easily oxidizable species that lead to the deposits. The deposits were characterized using CPMAS NMR, FTIR, elemental analysis, GCIR and chemical derivatization. They are highly aromatic, enriched in oxygen, nitrogen and sulfur relative to the fuel, and contain carboxylic acids and ketone functional groups. The role of nitrogen and sulfur containing compounds is also discussed. Gel permeation chromatography (GPC) of derivatized heated fuel shows a substantial growth in molecular weight. We find hydrocarbons equivalent to C-70 oxidation compounds in fuel heated in an air environment. In Jet A fuel, whose deposit formation capacity is not exhausted, the latter can continue to react at room temperature to form deposits. This is a concern especially for recirculating applications since it implies that once the fuel has been heated, deposits can precipitate in the holding tanks even when the fuel is cool.
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Su, Manyu, Lina Zhong, Yuanqiang Guo, Yuliang Ke, and Yunhui Fang. "Quality Control of Polycarboxylate Superplasticizer-Gel Permeation Chromatography." In 2020 International Conference on Artificial Intelligence and Electromechanical Automation (AIEA). IEEE, 2020. http://dx.doi.org/10.1109/aiea51086.2020.00153.

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Bantchev, Grigor, Steven Cermak, Amber Durham, and Neil Price. "Determination of Estolide Molecular Weight Distribution via Gel Permeation Chromatography." In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.233.

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Kirsti, Veggeland. "Associative and Repulsive Interactions in Polymer-Surfactant Systems Studied by Gel Permeation Chromatography." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/28951-ms.

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Han, Jung Y., Hyungbae Kim, Young S. Kim, Jihyun Yun, Sungun Kim, and Kwang W. Kim. "Aging Characterization of SMA and Dense-Graded Asphalt Mixtures Using Gel-Permeation Chromatography." In 2015 International Symposium on Frontiers of Road and Airport Engineering. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784414255.014.

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Zou, Xiao, Wulin Li, Genrong Li, Xiaohui Li, Mei Long, Wuping Huang, Yan Ma, and Zhaojing Xiao. "Screening Five High-toxic Organophosphorus Pesticides in Chinese tea Using Gel Permeation Chromatography-GC-MS Method." In 2016 5th International Conference on Advanced Materials and Computer Science (ICAMCS 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icamcs-16.2016.113.

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Mazurkiewicz, Paul. "Advanced Analytical Chemistry Techniques Enable Rapid, Cheap and Concise Electronic Failure Analysis." In ISTFA 2004. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.istfa2004p0457.

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Abstract This article introduces several analytical chemistry techniques that are extremely useful in the electronics failure analysis (FA) laboratory, but are not normally found in FA laboratories. It presents the techniques in simple language and makes a case for the inclusion of chemists in the rapidly evolving and ever-shrinking world of microelectronic failure analysis. The article discusses the following techniques in terms of their applications, advantages, and operating principles: gel permeation chromatography, gas chromatography-mass spectrometry, Fourier transform-infrared spectroscopy, and electron spectroscopy for chemical analysis (ESCA). As we move into the world of nanotechnology, these techniques will become key in analyzing failures that cannot be visualized using traditional FA methods.
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Purdon, A. D., and J. B. Smith. "RELEASE AND TRANSACYLATION OF ARACHIDONATE FROM A COMMON POOL OF 1-ACYL-2-ARACHIDONOYL GLYCEROPHOSPHOCHOLINE IN HUMAN PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643391.

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Abstract:
We have previously shown that the main source of arachidonate in thrombin-stimulated human platelets is 1-acyl-2-arachidonoyl (AA) glycerophosphocholine (GPC) and release of 3H-AA from this phospholipid also was correlated with increased 3H-AA in ether phospholipid. This ATP independent transfer of 3H-AA from 1,2 diacyl GPC to ether phospholipid (transacylation) also occurs in resting cells. Human platelets in 1/10 volume of plasma (ACD anticoagulant, pH 6.5) were radiolabelled with 3H-AA for 60 min at 37°C and then exogenous 3H-AA was removed by gel filtration into Tyrode's buffer, pH 7.4, 0.2% albumin. These radiolabelled cells were incubated in the absence of exogenous 3H-AA for four hours followed by Bligh and Dyer extraction and thin layer chromatography purification of phospholipids. 3H-AA in 1,2 diacyl GPC was found to decrease by over 20% and increase substantially in 1-0-alkyl-2-acyl GPC and 1-0-alk-1'-enyl-2-acyl glycerophospho ethanolamine (GPE), In this same time interval the mass of AA released by thrombin (5 U/ml, 10 min, 37°C, no stirring)in the presence of BIT 775C and measured by GLC, stayed the same (30 nmoles/109 cells), however, the specific activity decreased. Using reverse phase HPLC to resolve diradylglycerobenzoate derivatives of phospholipids: acylation, deacylation, and transacylation were observed for individual AA-containing molecular species of phospholipid, including those with an unsaturated fatty acid at sn-1. In particular the radiolabellinq of the 1-unsaturate-2-arachidonoyl GPC correlated with the specific activity of the 3H-AA released by stimulation with thrombin. Furthermore, 1-arachidonoyl-2-3H-arachidonoyl GPC was completely deacylated while 50 % of its mass remained. This contrasted with 16:0, and 18:0-2-arachidonoyl GPC in which the specific activity remained the same before and after deacylation. We conclude that deacylation of AA-containing molecular species of 1,2 diacyl GPC in stimulated cells includes molecular species which are also a source of arachidonic acid for transacylation reactions.
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10

Liu, Weimin, Lijun Weng, Dapeng Feng, and Haizhong Wang. "Investigation of Some Liquid Lubricants for Potential Aerospace Application." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63434.

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Some liquid lubricants for potential aerospace application were prepared. The lubricity of lubricants including silicon oil with and without chlorobenzene group, cyclotriphosphazene derivative X-1P and perfluoropolyether (PFPE) for both steel/steel and steel/bronze sliding pairs were investigated. Gel percolation chromatography (GPC) was used to detect the tribo-polymerization of the tested silicone oil. Materials related to friction pairs is essential, silicon oil and PFPE are not quite effective for lubrication of a steel/steel pair, but be able to reduce both friction and wear of a steel/bronze pair. Chemical reactive elemental such as chlorine, which is substituted into silicon oil, is helpful to improve the antiwear and load-carrying capacity of liquid lubricant. X-1P is also an effective liquid lubricant for both steel/steel and steel/bronze sliding pairs.
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Reports on the topic "Gel permeation chromatography (GPC)"

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Weber, William P. Preparative Gel Permeation Chromatography. Fort Belvoir, VA: Defense Technical Information Center, November 1989. http://dx.doi.org/10.21236/ada216936.

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