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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
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Use of Irradiated Polymers after Their Lifetime Period.

David Manas1,2, Miroslav Manas3, Ales Mizera4

  • 1Faculty of Applied Informatics, Tomas Bata University in Zlin, CEBIA-Tech, Nad Stranemi 4511, 760 05 Zlin, Czech Republic. dmanas@utb.cz.

Polymers
|April 11, 2019
PubMed
Summary

Recycled cross-linked High Density PolyEthylene (rHDPEx) powder can be used as a filler in Low Density PolyEthylene (LDPE) composites. Mechanical properties improve with more rHDPEx filler, up to 60% content.

Keywords:
end-of-life cyclemechanical propertiespolymer recyclingpolymersradiation cross-linking

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Area of Science:

  • Polymer Science
  • Materials Science
  • Waste Management

Background:

  • Polymer waste recycling is a significant environmental challenge.
  • Cross-linked plastics, unlike thermoplastics, cannot be easily re-melted for conventional recycling.
  • Irradiated High Density PolyEthylene (rHDPEx) products pose end-of-life processing difficulties.

Purpose of the Study:

  • To investigate the feasibility of utilizing end-of-life irradiated High Density PolyEthylene (rHDPEx) as a filler material.
  • To evaluate the impact of rHDPEx filler on the mechanical properties and processability of Low Density PolyEthylene (LDPE) composites.
  • To determine the optimal filler content for creating viable LDPE/rHDPEx composites.

Main Methods:

  • Preparation of rHDPEx in powder/grit form from post-consumer products.
  • Compounding rHDPEx filler into an LDPE matrix at various concentrations.
  • Testing the mechanical behavior (e.g., strength, stiffness) of the resulting composites.
  • Assessing the processability of the composite materials, including polymer mixture fluidity.

Main Results:

  • Composites containing up to 60% rHDPEx filler were successfully processed.
  • Polymer Mixture Fluidity significantly decreased as the concentration of rHDPEx filler increased.
  • Mechanical properties of the LDPE matrix predominantly improved with higher rHDPEx content.

Conclusions:

  • End-of-life irradiated HDPE can be effectively repurposed as a filler in LDPE.
  • The addition of rHDPEx enhances the mechanical performance of LDPE composites.
  • Processing parameters and material properties are strongly influenced by the rHDPEx filler loading.