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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Improved Polypropylene Thermoformability through Polyethylene Layering.

Alex M Jordan1, Laryssa Meyer1, Kyungtae Kim2

  • 1Plastics Engineering, University of Wisconsin─Stout, Menomonie, Wisconsin 54751, United States.

ACS Applied Materials & Interfaces
|July 18, 2022
PubMed
Summary
This summary is machine-generated.

Adding thin layers of linear low-density polyethylene (LLDPE) to isotactic polypropylene (iPP) significantly improves thermoforming properties. This multilayer plastic enhances melt strength and recyclability for advanced packaging solutions.

Keywords:
multilayer coextrusionpolymer mechanicspolyolefinsprocess analysisthermoforming

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Area of Science:

  • Materials Science
  • Polymer Engineering

Background:

  • Isotactic polypropylene (iPP) is cost-effective and recyclable but has poor melt strength, hindering thermoforming.
  • Linear low-density polyethylene (LLDPE) can enhance polymer properties when combined with iPP.

Purpose of the Study:

  • To improve the thermoformability of isotactic polypropylene (iPP) by incorporating thin layers of linear low-density polyethylene (LLDPE).
  • To characterize the thermoforming window and mechanical properties of the resulting multilayer sheets.

Main Methods:

  • Coextrusion of 10 thin LLDPE layers into iPP sheets.
  • Hot tensile tests and sheet sag measurements between 130-180 °C.
  • Positive vacuum forming of truncated conical cups and crush strength analysis.

Main Results:

  • Multilayer sheets exhibited increased extensional viscosity and reduced sag compared to pure iPP.
  • Thermoforming was enabled at lower temperatures (as low as 150 °C) due to decreased yield stress.
  • A broader thermoforming temperature range (up to 180 °C) and longer heating times were achieved.

Conclusions:

  • The addition of thin LLDPE layers significantly enhances the thermoformability of iPP.
  • The developed multilayer sheets offer improved processing capabilities and maintain recyclability as iPP.
  • This approach provides a viable solution for packaging applications requiring enhanced thermoforming performance.