Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography
Abstract
C-13-NMR spectroscopy and gel-permeation chromatography studies were carried out on different samples of typical commercial phenol-formaldehyde novolac resins. Six random novolac resins (NLO 1-6), with decreasing ratios of phenol/formaldehyde from 1:0.75 to 1:0.85, were prepared in the presence of oxalic acid at two different concentratons. A high-ortho novolac resin (NL-OO') was synthesized in the pH range 4-6 using zinc acetate (Zn(OAc)(2)), as catalyst. An improved description of the chemical structure, in terms of composition, the number of free para- and ortho-positions, the isomeric distribution, the degree of polymerization, the number average molecular weight, the degree of branching and molecular weight distribution, was obtained.
Keywords:
novolac resins / phenol-formaldehyde resins / NMR-spectroscopy / GPC-chromatographySource:
Journal of the Serbian Chemical Society, 1999, 64, 3, 177-189Publisher:
- Serbian Chemical Society, Belgrade
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Marković, Slobodanka AU - Đonlagić, Jasna AU - Zakrzewska, Joanna AU - Dunjić, Branko PY - 1999 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/237 AB - C-13-NMR spectroscopy and gel-permeation chromatography studies were carried out on different samples of typical commercial phenol-formaldehyde novolac resins. Six random novolac resins (NLO 1-6), with decreasing ratios of phenol/formaldehyde from 1:0.75 to 1:0.85, were prepared in the presence of oxalic acid at two different concentratons. A high-ortho novolac resin (NL-OO') was synthesized in the pH range 4-6 using zinc acetate (Zn(OAc)(2)), as catalyst. An improved description of the chemical structure, in terms of composition, the number of free para- and ortho-positions, the isomeric distribution, the degree of polymerization, the number average molecular weight, the degree of branching and molecular weight distribution, was obtained. PB - Serbian Chemical Society, Belgrade T2 - Journal of the Serbian Chemical Society T1 - Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography EP - 189 IS - 3 SP - 177 VL - 64 UR - https://hdl.handle.net/21.15107/rcub_technorep_237 ER -
@article{ author = "Marković, Slobodanka and Đonlagić, Jasna and Zakrzewska, Joanna and Dunjić, Branko", year = "1999", abstract = "C-13-NMR spectroscopy and gel-permeation chromatography studies were carried out on different samples of typical commercial phenol-formaldehyde novolac resins. Six random novolac resins (NLO 1-6), with decreasing ratios of phenol/formaldehyde from 1:0.75 to 1:0.85, were prepared in the presence of oxalic acid at two different concentratons. A high-ortho novolac resin (NL-OO') was synthesized in the pH range 4-6 using zinc acetate (Zn(OAc)(2)), as catalyst. An improved description of the chemical structure, in terms of composition, the number of free para- and ortho-positions, the isomeric distribution, the degree of polymerization, the number average molecular weight, the degree of branching and molecular weight distribution, was obtained.", publisher = "Serbian Chemical Society, Belgrade", journal = "Journal of the Serbian Chemical Society", title = "Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography", pages = "189-177", number = "3", volume = "64", url = "https://hdl.handle.net/21.15107/rcub_technorep_237" }
Marković, S., Đonlagić, J., Zakrzewska, J.,& Dunjić, B.. (1999). Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography. in Journal of the Serbian Chemical Society Serbian Chemical Society, Belgrade., 64(3), 177-189. https://hdl.handle.net/21.15107/rcub_technorep_237
Marković S, Đonlagić J, Zakrzewska J, Dunjić B. Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography. in Journal of the Serbian Chemical Society. 1999;64(3):177-189. https://hdl.handle.net/21.15107/rcub_technorep_237 .
Marković, Slobodanka, Đonlagić, Jasna, Zakrzewska, Joanna, Dunjić, Branko, "Study of the structure of phenol-formaldehyde novolac resins by NMR spectroscopy and gel-permeation chromatography" in Journal of the Serbian Chemical Society, 64, no. 3 (1999):177-189, https://hdl.handle.net/21.15107/rcub_technorep_237 .