Chemical Composition Distribution and Molecular Weight Distribution Determination of Ethylene, 1-Butene Linear Low-Density Polyethylene (LLDPE)

Autor:	I. Mingozzi, S. Nascetti
Rok vydání:	1996
Předmět:	Materials science Polymers and Plastics Elution General Chemical Engineering Analytical chemistry 1-Butene Fractionation Analytical Chemistry Gel permeation chromatography Linear low-density polyethylene Crystallinity chemistry.chemical_compound chemistry Molar mass distribution Infrared microscopy
Zdroj:	International Journal of Polymer Analysis and Characterization. 3:59-73
ISSN:	1563-5341 1023-666X
DOI:	10.1080/10236669608032754
Popis:	Two ethylene, 1-butene copolymer samples, obtained by heterogeneous Ziegler-Natta catalysis and two obtained by homogeneous zirconium-based catalysis, were characterized. Fractionation, based mainly on crystallinity, was carried out by means of temperature-rising elution fractionation using an analytical custom-built apparatus (A-TREF). This technique provided a continuous representation of TREF distribution from the detector signal. In addition, a simple and inexpensive off-line sampling method to collect eluted fractions, as low as 0.3 mg, suitable for composition determination by infrared microspectroscopy and subsequent gel permeation chromatography fractionation is reported. The experimental results showed that all the samples studied were compositionally heterogeneous, and that their A-TREF profiles reflect the nature of the parent catalyst system.
Databáze:	OpenAIRE
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