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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polyethylene comonomer characterization by using FTIR and a multivariate classification technique.

Ester Caro1, Enric Comas1

  • 1The Dow Chemical Company, P Building, Autovia Tarragona-Salou s/n, 43006 Tarragona, Spain.

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|November 26, 2016
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Summary
This summary is machine-generated.

This study introduces a fast FTIR method combined with multivariate analysis for identifying comonomer types in polyethylene films. This technique quickly distinguishes between octene, hexene, and butene in linear low-density polyethylene (LLDPE) coextruded films.

Keywords:
Coextruded filmsComonomerFTIRLinear low density polyethylene (LLDPE)PCAPackaging industry

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Analytical Chemistry

Background:

  • Polyethylene (PE) films are crucial in packaging, often using multi-layer coextrusion.
  • Identifying comonomer types (octene, hexene, butene) in linear low-density polyethylene (LLDPE) films is increasingly important.

Purpose of the Study:

  • To develop and present a novel, rapid method for identifying comonomer types in coextruded LLDPE films.
  • To utilize multivariate classification techniques with Fourier-transform infrared (FTIR) spectroscopy for this identification.

Main Methods:

  • Fourier-transform infrared (FTIR) spectroscopy was used to measure coextruded LLDPE film samples.
  • Principal Component Analysis (PCA) was applied to process the FTIR spectral data.
  • Samples were projected onto scores plots to observe differences based on comonomer composition.

Main Results:

  • FTIR combined with PCA successfully differentiated LLDPE films based on their comonomer types (octene, hexene, butene).
  • The scores plots from PCA revealed distinct clustering or separation corresponding to different comonomer compositions.
  • The developed approach demonstrated significantly faster analysis times compared to existing methods.

Conclusions:

  • Multivariate classification techniques coupled with FTIR provide an efficient and rapid means for identifying comonomer types in coextruded LLDPE films.
  • This method offers a practical solution for quality control and material characterization in the packaging industry.
  • The speed of direct infrared analysis makes this approach highly advantageous.