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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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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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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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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Polymers02:34

Polymers

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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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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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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Depolymerization mechanisms and closed-loop assessment in polyester waste recycling.

Jingjing Cao1, Huaxing Liang1, Jie Yang2

  • 1CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, China.

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This study presents an efficient poly(ethylene terephthalate) (PET) waste recycling method using an oxygen-vacancy catalyst. The process significantly enhances monomer production rates and offers substantial energy savings for sustainable plastic waste management.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Poly(ethylene terephthalate) (PET) waste poses a significant environmental challenge.
  • Alcoholysis, including methanolysis and glycolysis, offers a promising route for PET waste valorization into valuable monomers like dimethyl terephthalate (DMT) and bis-2-hydroxyethyl terephthalate (BHET).
  • Existing PET alcoholysis methods often suffer from low efficiency and require harsh reaction conditions.

Purpose of the Study:

  • To develop an efficient and sustainable catalytic system for PET alcoholysis under air.
  • To elucidate the reaction mechanism of PET depolymerization facilitated by oxygen vacancies.
  • To assess the environmental and economic viability of the developed process for closed-loop PET recycling.

Main Methods:

  • Utilized an oxygen-vacancy (Vo)-rich catalyst for PET alcoholysis (methanolysis and glycolysis) under ambient air.
  • Employed in situ spectroscopy and density functional theory (DFT) calculations to investigate reaction pathways.
  • Conducted a life cycle assessment (LCA) to evaluate energy savings, greenhouse gas emissions, and cost-effectiveness, including the use of PET textile scrap.

Main Results:

  • Achieved high space time yields (STY) for DMT (505.2 g·gcat-1·h-1) and BHET (957.1 g·gcat-1·h-1), representing 51-fold and 28-fold enhancements compared to N2 conditions.
  • Identified O2-assisted activation of methanol at Vo-Zn2+-O-Fe3+ sites as the key mechanism for ester bond cleavage.
  • Demonstrated significant environmental benefits: 56.0% energy savings and 44.5% reduction in greenhouse gas emissions.
  • Showcased economic advantages, with a 58.4% reduction in operating costs when using PET textile scrap.

Conclusions:

  • The Vo-rich catalyst enables highly efficient PET alcoholysis under air, significantly outperforming reactions under inert atmospheres.
  • The study provides a mechanistic understanding of the catalytic process, highlighting the crucial role of oxygen vacancies and specific active sites.
  • This approach offers a sustainable and economically viable solution for closed-loop PET recycling, addressing the global challenge of plastic waste accumulation.