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dc.contributor.author정회일-
dc.date.accessioned2016-10-28T02:25:27Z-
dc.date.available2016-10-28T02:25:27Z-
dc.date.issued2015-04-
dc.identifier.citationANALYST, v. 140, NO 6, Page. 1906-1912en_US
dc.identifier.issn0003-2654-
dc.identifier.issn1364-5528-
dc.identifier.urihttp://pubs.rsc.org/en/Content/ArticleLanding/2015/AN/C4AN02144D#!divAbstract-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/23976-
dc.description.abstractA simple and effective strategy for improving the accuracy of the multivariate determination of polyethylene (PE) density using Raman spectroscopy has been demonstrated. This strategy is based on the possibility that varied polymeric structures of the PE samples, especially at a sub-zero temperature range, would enhance their spectral selectivity, thereby potentially improving the multivariate correlation with their pre-determined physical properties such as density. For the evaluation, Raman spectra were collected at regular intervals during continuous increase of the PE temperature from cryogenic to near room temperature. Then, using partial least squares (PLS) regression, calibration models were developed to correlate the Raman spectral features collected at each time period with the reference PE density values. Interestingly, the accuracy was improved when the temperature of the PE pellets was -35 degrees C, near the glass transition temperature (T-g). To explain the improved accuracy, a two-dimensional (2D) correlation analysis was employed to detail the spectral variation induced by temperature change. Diverse segmental chain motions (so called micro-Brownian motion) predominantly occurring in the amorphous section of the PEs around T-g greatly enhanced the spectral selectivity among PE samples. In addition, minor beta-relaxation occurring around this temperature was an additional source of the enhanced spectral selectivity. In parallel, differential scanning calorimetry (DSC) curves of the samples were also examined to check the existence of the phase transitions.en_US
dc.description.sponsorshipThis research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2012R1A1B3003965).en_US
dc.language.isoenen_US
dc.publisherROYAL SOC CHEMISTRYen_US
dc.subjectMULTIVARIATE DATA-ANALYSISen_US
dc.subjectX-RAY-DIFFRACTIONen_US
dc.subjectCORRELATION SPECTROSCOPYen_US
dc.subjectRELAXATIONen_US
dc.subjectTRANSFORMen_US
dc.subjectCALIBRATIONen_US
dc.subjectPREDICTIONen_US
dc.subjectDEPENDENCEen_US
dc.titleMeasurement of polyethylene pellets near the glass transition temperature to enhance Raman spectral selectivity among samples and improve accuracy for density determinationen_US
dc.typeArticleen_US
dc.relation.no6-
dc.relation.volume140-
dc.identifier.doi10.1039/c4an02144d-
dc.relation.page1906-1912-
dc.relation.journalANALYST-
dc.contributor.googleauthorKim, Saetbyeol-
dc.contributor.googleauthorShinzawa, Hideyuki-
dc.contributor.googleauthorChung, Hoeil-
dc.contributor.googleauthorOzaki, Yukihiro-
dc.relation.code2015002254-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF NATURAL SCIENCES[S]-
dc.sector.departmentDEPARTMENT OF CHEMISTRY-
dc.identifier.pidhoeil-
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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