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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Development of toxicity tests for Polyurethane foams.

Julie Mallouhi1,2, Enikő Hornyák-Mester1,2, Miklós Varga1,2

  • 1Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary.

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|October 15, 2024
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Summary

Ecotoxicological assessment of polyurethane (PU) foams is crucial due to potential toxic compound release. This study adapted toxicity tests using white mustard seeds and E. coli bacteria to evaluate PU foam ecotoxicity, finding significant impacts at higher NCO indices.

Keywords:
Acute toxicity testEcotoxicological assessmentEscherichia coliPolyurethaneSinapis alba

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Area of Science:

  • Environmental Science
  • Materials Science
  • Toxicology

Background:

  • Polyurethanes (PUs) are versatile polymers used in numerous products, including foams.
  • End-of-life PU products in landfills pose environmental risks due to potential toxic compound release.
  • Ecotoxicological assessment of PU foams is essential for understanding their environmental impact.

Purpose of the Study:

  • To develop and adapt toxicity testing procedures for ecotoxicological assessment of polyurethane foams.
  • To evaluate the ecotoxicity of PU foams with varying NCO indices.
  • To validate the developed toxicity tests using model organisms.

Main Methods:

  • Five PU foam samples were prepared with different NCO indices (0.8 to 1.2).
  • Toxicity tests were adapted for Sinapis alba (white mustard) seeds and Escherichia coli (non-pathogenic bacteria).
  • A control non-toxic foam and a toxic foam were used for validation.

Main Results:

  • The highest NCO index (NCO-1.2) significantly reduced white mustard root length by 9.8% compared to the control.
  • PU foams with NCO indices 1.1 and 1.2 showed lower E. coli colony numbers compared to the control.
  • The developed toxicity tests successfully differentiated toxicity levels among PU foam samples.

Conclusions:

  • Two toxicity tests, one with white mustard seeds and another with E. coli, were successfully adapted for the ecotoxicological assessment of PU foams.
  • These adapted tests are applicable for evaluating the environmental safety of PU foam materials.
  • The NCO index is a critical factor influencing the ecotoxicity of PU foams.