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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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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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Recent Advances in Solid-State Modification for Thermoplastic Polymers: A Comprehensive Review.

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Molecules (Basel, Switzerland)
|February 10, 2024
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Summary

Solid-state modification (SSM) offers a novel way to enhance thermoplastic polymers by reacting monomers within their structure. This approach presents sustainable solutions for plastic recycling and upcycling, advancing the circular economy.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Thermoplastics have seen widespread use over the last century, leading to environmental and health concerns from additives.
  • Existing melt modification methods have limitations, necessitating exploration of alternative polymer processing techniques.

Purpose of the Study:

  • To review the emerging field of solid-state modification (SSM) for thermoplastic polymers.
  • To highlight SSM's potential for enhancing material properties and promoting environmental sustainability.

Main Methods:

  • Incorporation of monomers or oligomers into the amorphous phase of polymers via exchange reactions.
  • Application of SSM to various thermoplastic polymers to alter their intrinsic properties.

Main Results:

  • SSM enables unique modifications not achievable through traditional melt processing.
  • Demonstrated effectiveness of SSM in enhancing polymer performance for applications like catalysts and composites.
  • SSM shows significant potential for the recycling and upcycling of plastic waste.

Conclusions:

  • Solid-state modification is a promising technique for advanced polymer development and property enhancement.
  • SSM offers a sustainable pathway for addressing plastic waste and advancing a circular economy in the polymer industry.
  • Further research is needed to address scalability challenges for industrial applications of SSM.