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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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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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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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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Updated: Jun 21, 2025

The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Comparing End-of-Life Vehicle (ELV) and Packaging-Based Recyclates as Components in Polypropylene-Based Compounds for

Markus Gall1, Daniela Mileva1, Wolfgang Stockreiter1

  • 1Borealis Polyolefine GmbH, Innovation Headquarters, St Peterstr. 25, 4021 Linz, Austria.

Polymers
|July 13, 2024
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Summary
This summary is machine-generated.

Recycled plastics from end-of-life vehicles (ELVs) can create high-performance polypropylene compounds for cars, potentially outperforming packaging recyclates. Further development is needed to match virgin material flowability.

Keywords:
automotivemechanicsmorphologypolypropylenerecycling

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Area of Science:

  • Materials Science
  • Sustainable Engineering
  • Automotive Recycling

Background:

  • The automotive industry aims to increase recycled plastic content to 25% by 2030 for decarbonization.
  • Plastics recovered from end-of-life vehicles (ELVs) are underutilized in current automotive compounds.
  • A knowledge gap exists regarding the performance of ELV-derived recyclates.

Purpose of the Study:

  • To analyze ELV recyclate grades from bumpers for automotive applications.
  • To compare ELV recyclates against packaging-based post-consumer recyclates (PCR).
  • To design and characterize polypropylene (PP) compounds using ELV recyclates.

Main Methods:

  • Two ELV recyclate grades (bumper-based) and one packaging-based PCR were analyzed for composition.
  • Polypropylene (PP) compounds were formulated with virgin base material and mineral reinforcement.
  • Mechanical properties and flowability of compounds were characterized against a virgin-based reference.

Main Results:

  • A PP compound with 40 wt.-% ELV-based bumper recyclate demonstrated a superior stiffness/impact balance compared to a 25 wt.-% packaging-based recyclate compound.
  • Mechanical properties of ELV-based compounds closely matched the virgin reference material.
  • Flowability of all post-consumer recyclate (PCR) compounds was lower than the virgin reference.

Conclusions:

  • ELV-based recyclates show significant potential for high-performance automotive polypropylene compounds.
  • Achieving comparable mechanical properties is feasible, but flowability requires further optimization.
  • Increased use of ELV recyclates can support automotive industry decarbonization goals.