Quantitative Analysis of Functional Groups in HDPE Powder by DRIFT Spectroscopy

Eniko Földes, Zoltán Szabó, Ákos Janecska, Gábor Nagy, Béla Pukánszky

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

FT-IR spectra of ethylene homopolymers and ethylene/1-hexene copolymers polymerized under different conditions were studied by transmission and diffuse reflection (DRIFT) spectroscopy. The absorbance spectra of film samples were compared with the DRIFT spectra of powders ground from the films. For determining the concentration of the methyl and unsaturated (vinyl, vinylidene and trans-vinylene) groups of polyethylene powders the DRIFT spectra were calibrated by comparing the IR intensities of the corresponding bands measured by the two methods. The results proved that the effect of differences in scattering of the polymer powder originating from the irregularity of the top surface, as well as the size and shape of the particles can be eliminated by the use of a proper internal standard. Linear correlation was established between the logarithms of the normalized intensities measured in absorbance and Kubelka-Munk units. In the case of polyethylene the selection of the internal reference band affects significantly the accuracy of the calibration due to the difference in the refractive indices of the crystalline and amorphous phases.

Original languageEnglish
Pages (from-to)97-116
Number of pages20
JournalMacromolecular Symposia
Volume202
DOIs
Publication statusPublished - Sep 2003

Keywords

  • DRIFT
  • Diffuse reflection
  • FT-IR
  • Polyethylene
  • Transmission

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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