Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization
Predominantly isotactic stereoregular polyacrylonitrile copolymers (PAC) were prepared by solid phase polymerization techniques using hexagonal crystalline metal salts as template compounds. Stereoregular distributions of the prepared polymer were studied using high resolution 13C nuclear magnetic r...
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| Language: | English |
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Budapest University of Technology and Economics
2012-09-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0003431&mi=cd |
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| author | G. Santhana Krishnan H. Phadnis A. Burkanudeen N. Murali |
| author_facet | G. Santhana Krishnan H. Phadnis A. Burkanudeen N. Murali |
| author_sort | G. Santhana Krishnan |
| collection | DOAJ |
| description | Predominantly isotactic stereoregular polyacrylonitrile copolymers (PAC) were prepared by solid phase polymerization techniques using hexagonal crystalline metal salts as template compounds. Stereoregular distributions of the prepared polymer were studied using high resolution 13C nuclear magnetic resonance spectroscopy (13C NMR) spectra. The extent of isotacticity was directly determined from the peak intensity of the methine carbon (CH). The triad tacticity from the intensities of methine carbon peaks were examined by statistical methods. It was found that the PAC was predominantly isotactic in stereoregularity, and its sequence distribution obeys Bernoulli statistics. The optimum polymerization conditions ensuring isotactic content over 50% were disclosed experimentally. The chemical composition of PAC was confirmed with 1H NMR data. The obtained polyacrylonitrile copolymers were also characterized for molecular parameters such as viscosity average molecular weight (Mv), number average molecular weight (Mn), weight average molecular weight (Mw) and polydispersity index. |
| format | Article |
| id | doaj-art-8c5ce3ea6a584615a41b9912791393e0 |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2012-09-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-8c5ce3ea6a584615a41b9912791393e02025-08-20T03:33:53ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2012-09-016972973810.3144/expresspolymlett.2012.78Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerizationG. Santhana KrishnanH. PhadnisA. BurkanudeenN. MuraliPredominantly isotactic stereoregular polyacrylonitrile copolymers (PAC) were prepared by solid phase polymerization techniques using hexagonal crystalline metal salts as template compounds. Stereoregular distributions of the prepared polymer were studied using high resolution 13C nuclear magnetic resonance spectroscopy (13C NMR) spectra. The extent of isotacticity was directly determined from the peak intensity of the methine carbon (CH). The triad tacticity from the intensities of methine carbon peaks were examined by statistical methods. It was found that the PAC was predominantly isotactic in stereoregularity, and its sequence distribution obeys Bernoulli statistics. The optimum polymerization conditions ensuring isotactic content over 50% were disclosed experimentally. The chemical composition of PAC was confirmed with 1H NMR data. The obtained polyacrylonitrile copolymers were also characterized for molecular parameters such as viscosity average molecular weight (Mv), number average molecular weight (Mn), weight average molecular weight (Mw) and polydispersity index.http://www.expresspolymlett.com/letolt.php?file=EPL-0003431&mi=cdPolymer synthesis, molecular ePolyacrylonitrile copolymerNMRstereoregularitymolecular weight distribution |
| spellingShingle | G. Santhana Krishnan H. Phadnis A. Burkanudeen N. Murali Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization eXPRESS Polymer Letters Polymer synthesis, molecular e Polyacrylonitrile copolymer NMR stereoregularity molecular weight distribution |
| title | Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| title_full | Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| title_fullStr | Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| title_full_unstemmed | Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| title_short | Facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| title_sort | facile synthesis of stereoregular carbon fiber precursor polymers by template assisted solid phase polymerization |
| topic | Polymer synthesis, molecular e Polyacrylonitrile copolymer NMR stereoregularity molecular weight distribution |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0003431&mi=cd |
| work_keys_str_mv | AT gsanthanakrishnan facilesynthesisofstereoregularcarbonfiberprecursorpolymersbytemplateassistedsolidphasepolymerization AT hphadnis facilesynthesisofstereoregularcarbonfiberprecursorpolymersbytemplateassistedsolidphasepolymerization AT aburkanudeen facilesynthesisofstereoregularcarbonfiberprecursorpolymersbytemplateassistedsolidphasepolymerization AT nmurali facilesynthesisofstereoregularcarbonfiberprecursorpolymersbytemplateassistedsolidphasepolymerization |