Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers

In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular stru...
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Autor*in:	Dingcheng Liang [verfasserIn] Deqian Liu [verfasserIn] Shuai Yang [verfasserIn] Changyu Lu [verfasserIn] Qiang Xie [verfasserIn] Jinchang Liu [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	carbon fiber isotropic pitch bromination-dehydrobromination microstructure

Übergeordnetes Werk:	In: Polymers - MDPI AG, 2011, 12(2020), 12, p 3059
Übergeordnetes Werk:	volume:12 ; year:2020 ; number:12, p 3059

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/polym12123059

Katalog-ID:	DOAJ00159138X

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allfields	10.3390/polym12123059 doi (DE-627)DOAJ00159138X (DE-599)DOAJ12f8bfab90a24fdb81a40f98e8526890 DE-627 ger DE-627 rakwb eng QD241-441 Dingcheng Liang verfasserin aut Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers. carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry Deqian Liu verfasserin aut Shuai Yang verfasserin aut Changyu Lu verfasserin aut Qiang Xie verfasserin aut Jinchang Liu verfasserin aut In Polymers MDPI AG, 2011 12(2020), 12, p 3059 (DE-627)61409612X (DE-600)2527146-5 20734360 nnns volume:12 year:2020 number:12, p 3059 https://doi.org/10.3390/polym12123059 kostenfrei https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 kostenfrei https://www.mdpi.com/2073-4360/12/12/3059 kostenfrei https://doaj.org/toc/2073-4360 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2020 12, p 3059
spelling	10.3390/polym12123059 doi (DE-627)DOAJ00159138X (DE-599)DOAJ12f8bfab90a24fdb81a40f98e8526890 DE-627 ger DE-627 rakwb eng QD241-441 Dingcheng Liang verfasserin aut Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers. carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry Deqian Liu verfasserin aut Shuai Yang verfasserin aut Changyu Lu verfasserin aut Qiang Xie verfasserin aut Jinchang Liu verfasserin aut In Polymers MDPI AG, 2011 12(2020), 12, p 3059 (DE-627)61409612X (DE-600)2527146-5 20734360 nnns volume:12 year:2020 number:12, p 3059 https://doi.org/10.3390/polym12123059 kostenfrei https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 kostenfrei https://www.mdpi.com/2073-4360/12/12/3059 kostenfrei https://doaj.org/toc/2073-4360 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2020 12, p 3059
allfields_unstemmed	10.3390/polym12123059 doi (DE-627)DOAJ00159138X (DE-599)DOAJ12f8bfab90a24fdb81a40f98e8526890 DE-627 ger DE-627 rakwb eng QD241-441 Dingcheng Liang verfasserin aut Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers. carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry Deqian Liu verfasserin aut Shuai Yang verfasserin aut Changyu Lu verfasserin aut Qiang Xie verfasserin aut Jinchang Liu verfasserin aut In Polymers MDPI AG, 2011 12(2020), 12, p 3059 (DE-627)61409612X (DE-600)2527146-5 20734360 nnns volume:12 year:2020 number:12, p 3059 https://doi.org/10.3390/polym12123059 kostenfrei https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 kostenfrei https://www.mdpi.com/2073-4360/12/12/3059 kostenfrei https://doaj.org/toc/2073-4360 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2020 12, p 3059
allfieldsGer	10.3390/polym12123059 doi (DE-627)DOAJ00159138X (DE-599)DOAJ12f8bfab90a24fdb81a40f98e8526890 DE-627 ger DE-627 rakwb eng QD241-441 Dingcheng Liang verfasserin aut Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers. carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry Deqian Liu verfasserin aut Shuai Yang verfasserin aut Changyu Lu verfasserin aut Qiang Xie verfasserin aut Jinchang Liu verfasserin aut In Polymers MDPI AG, 2011 12(2020), 12, p 3059 (DE-627)61409612X (DE-600)2527146-5 20734360 nnns volume:12 year:2020 number:12, p 3059 https://doi.org/10.3390/polym12123059 kostenfrei https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 kostenfrei https://www.mdpi.com/2073-4360/12/12/3059 kostenfrei https://doaj.org/toc/2073-4360 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2020 12, p 3059
allfieldsSound	10.3390/polym12123059 doi (DE-627)DOAJ00159138X (DE-599)DOAJ12f8bfab90a24fdb81a40f98e8526890 DE-627 ger DE-627 rakwb eng QD241-441 Dingcheng Liang verfasserin aut Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers. carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry Deqian Liu verfasserin aut Shuai Yang verfasserin aut Changyu Lu verfasserin aut Qiang Xie verfasserin aut Jinchang Liu verfasserin aut In Polymers MDPI AG, 2011 12(2020), 12, p 3059 (DE-627)61409612X (DE-600)2527146-5 20734360 nnns volume:12 year:2020 number:12, p 3059 https://doi.org/10.3390/polym12123059 kostenfrei https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 kostenfrei https://www.mdpi.com/2073-4360/12/12/3059 kostenfrei https://doaj.org/toc/2073-4360 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2020 12, p 3059
language	English
source	In Polymers 12(2020), 12, p 3059 volume:12 year:2020 number:12, p 3059
sourceStr	In Polymers 12(2020), 12, p 3059 volume:12 year:2020 number:12, p 3059
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	carbon fiber isotropic pitch bromination-dehydrobromination microstructure Organic chemistry
isfreeaccess_bool	true
container_title	Polymers
authorswithroles_txt_mv	Dingcheng Liang @@aut@@ Deqian Liu @@aut@@ Shuai Yang @@aut@@ Changyu Lu @@aut@@ Qiang Xie @@aut@@ Jinchang Liu @@aut@@
publishDateDaySort_date	2020-01-01T00:00:00Z
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callnumber-first	Q - Science
author	Dingcheng Liang
spellingShingle	Dingcheng Liang misc QD241-441 misc carbon fiber misc isotropic pitch misc bromination-dehydrobromination misc microstructure misc Organic chemistry Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
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topic_title	QD241-441 Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers carbon fiber isotropic pitch bromination-dehydrobromination microstructure
topic	misc QD241-441 misc carbon fiber misc isotropic pitch misc bromination-dehydrobromination misc microstructure misc Organic chemistry
topic_unstemmed	misc QD241-441 misc carbon fiber misc isotropic pitch misc bromination-dehydrobromination misc microstructure misc Organic chemistry
topic_browse	misc QD241-441 misc carbon fiber misc isotropic pitch misc bromination-dehydrobromination misc microstructure misc Organic chemistry
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title	Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
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title_full	Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
author_sort	Dingcheng Liang
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author_browse	Dingcheng Liang Deqian Liu Shuai Yang Changyu Lu Qiang Xie Jinchang Liu
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title_sort	effects of bromination-dehydrobromination on the microstructure of isotropic pitch precursors for carbon fibers
callnumber	QD241-441
title_auth	Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
abstract	In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers.
abstractGer	In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers.
abstract_unstemmed	In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and <sup<13</sup<C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers.
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title_short	Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
url	https://doi.org/10.3390/polym12123059 https://doaj.org/article/12f8bfab90a24fdb81a40f98e8526890 https://www.mdpi.com/2073-4360/12/12/3059 https://doaj.org/toc/2073-4360
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