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Titolo:
Quantifying short chain branching microstructures in ethylene 1-olefin copolymers using size exclusion chromatography and Fourier transform infrared spectroscopy (SEC-FTIR)
Autore:
DesLauriers, PJ; Rohlfing, DC; Hsieh, ET;
Indirizzi:
Chevron Phillips Chem Co LP, Bartlesville, OK 74004 USA Chevron Phillips Chem Co LP Bartlesville OK USA 74004 ville, OK 74004 USA
Titolo Testata:
POLYMER
fascicolo: 1, volume: 43, anno: 2002,
pagine: 159 - 170
SICI:
0032-3861(200201)43:1<159:QSCBMI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-WEIGHT; POLYETHYLENE;
Keywords:
ethylene copolymers; short chain branching; chemometric techniques;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: DesLauriers, PJ Chevron Phillips Chem Co LP, Bartlesville, OK 74004 USA Chevron Phillips Chem Co LP Bartlesville OK USA 74004 USA
Citazione:
P.J. DesLauriers et al., "Quantifying short chain branching microstructures in ethylene 1-olefin copolymers using size exclusion chromatography and Fourier transform infrared spectroscopy (SEC-FTIR)", POLYMER, 43(1), 2002, pp. 159-170

Abstract

A rapid method for the SEC-FTIR analysis of short chain branching distribution (SCBD) across the molecular weight distribution (NWD) is described andits application demonstrated using ethylene 1-olefins copolymers. Chromatograms. are generated using the root mean square absorbance over the 3000-2700 cm(-1) spectral region (i.e. FTIR serves as a concentration detector), Spectra from individual time slices of the chromatogram are subsequently analyzed for comonomer branch levels using chemometric techniques. Furthermore, we are able to estimate error in the reported SCB content of each slice. Using the appropriate training sets, chemometric models can be constructed which provide SCB versus MWD profiles with sufficient precision to detect trends resulting from catalyst and process changes in LDPE and/or HDPE samples. We demonstrated the method by showing the results of a model that has enabled us to accurately quantify branching levels in polyolefins within +/-0.5/1000 total carbons (i.e. ca. 0.1 mol%) in samples with relatively low levels of SCB (i.e. < 10 SCB/total carbons) and mixed branch types. (C) 2001Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 11:30:14