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Article: Thermal Analysis of Liquid Crystal Phase Transition Using FTIR Spectroscopy

TitleThermal Analysis of Liquid Crystal Phase Transition Using FTIR Spectroscopy
Authors
KeywordsFtir Spectroscopy
Liquid Crystal
Phase Transition
Thermal Analysis
Issue Date2001
PublisherJilin Daxue. The Journal's web site is located at http://www.cjcu.jlu.edu.cn/
Citation
Kao Teng Hsueh Hsiao Hua Heush Hsueh Pao/ Chemical Journal Of Chinese Universities, 2001, v. 22 n. 12, p. 2125 How to Cite?
AbstractThermal spectra of liquid crystal, p-n-dodecyloxy benzoic acid were collected at 26-150 'C by FTIR microspectroscopy. Conformational apparent enthalpy differences ΔH in phase transitions have been determined by van't Hoff equation at constant pressure and plotted with temperature. Compared to DSC, these enthalpies plot with temperature could be divided into three types. The first one was long alkyl chain group which has only one apparent endothermic enthalpy peak at 95 'C. The second one was partial carbonyl and aromatic ether groups has three endothermic enthalpy peaks in the phase transition. The third type including benzoyl group which has one exothermic enthalpy peak at 95 'C and a broad endothermic enthalpy peak in the range of 128-140 'C. These differences indicated that oxy-benzoic acid part of dodecyloxy benzoic acid recrystallized to cycle dimer during alkyl chain melting in crystal-smectic phase transition.
Persistent Identifierhttp://hdl.handle.net/10722/167864
ISSN
2015 Impact Factor: 0.791
2015 SCImago Journal Rankings: 0.211
References

 

DC FieldValueLanguage
dc.contributor.authorWu, Qen_US
dc.contributor.authorLi, CXen_US
dc.contributor.authorLi, XCen_US
dc.contributor.authorLi, YHen_US
dc.date.accessioned2012-10-08T03:12:17Z-
dc.date.available2012-10-08T03:12:17Z-
dc.date.issued2001en_US
dc.identifier.citationKao Teng Hsueh Hsiao Hua Heush Hsueh Pao/ Chemical Journal Of Chinese Universities, 2001, v. 22 n. 12, p. 2125en_US
dc.identifier.issn0251-0790en_US
dc.identifier.urihttp://hdl.handle.net/10722/167864-
dc.description.abstractThermal spectra of liquid crystal, p-n-dodecyloxy benzoic acid were collected at 26-150 'C by FTIR microspectroscopy. Conformational apparent enthalpy differences ΔH in phase transitions have been determined by van't Hoff equation at constant pressure and plotted with temperature. Compared to DSC, these enthalpies plot with temperature could be divided into three types. The first one was long alkyl chain group which has only one apparent endothermic enthalpy peak at 95 'C. The second one was partial carbonyl and aromatic ether groups has three endothermic enthalpy peaks in the phase transition. The third type including benzoyl group which has one exothermic enthalpy peak at 95 'C and a broad endothermic enthalpy peak in the range of 128-140 'C. These differences indicated that oxy-benzoic acid part of dodecyloxy benzoic acid recrystallized to cycle dimer during alkyl chain melting in crystal-smectic phase transition.en_US
dc.languageengen_US
dc.publisherJilin Daxue. The Journal's web site is located at http://www.cjcu.jlu.edu.cn/en_US
dc.relation.ispartofKao Teng Hsueh Hsiao Hua Heush Hsueh Pao/ Chemical Journal of Chinese Universitiesen_US
dc.subjectFtir Spectroscopyen_US
dc.subjectLiquid Crystalen_US
dc.subjectPhase Transitionen_US
dc.subjectThermal Analysisen_US
dc.titleThermal Analysis of Liquid Crystal Phase Transition Using FTIR Spectroscopyen_US
dc.typeArticleen_US
dc.identifier.emailLi, XC:xuechenl@hku.hken_US
dc.identifier.authorityLi, XC=rp00742en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0347666193en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0347666193&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume22en_US
dc.identifier.issue12en_US
dc.identifier.spage2125en_US
dc.publisher.placeChinaen_US
dc.identifier.scopusauthoridWu, Q=35468560800en_US
dc.identifier.scopusauthoridLi, CX=8931261400en_US
dc.identifier.scopusauthoridLi, XC=24168958800en_US
dc.identifier.scopusauthoridLi, YH=7502089551en_US

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