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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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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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Recent progress in calcium-catalyzed polyester synthesis.

Jesús Naranjo1, José A Castro-Osma1, Felipe de la Cruz-Martínez1

  • 1Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas and Instituto Regional de Investigación Científica Aplicada-IRICA, 13071-Ciudad Real, Spain. Felipe.Cruz@uclm.es.

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Calcium catalysts offer a sustainable route to biodegradable polyesters. This research highlights their use in ring-opening polymerization and copolymerization of bio-sourced cyclic monomers for advanced materials.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Catalysis

Background:

  • Growing demand for biodegradable and functional materials due to fossil fuel depletion and environmental concerns.
  • Need for efficient synthetic routes to produce polyesters with controlled properties.
  • Exploration of bio-sourced platform molecules as alternatives to petroleum-based feedstocks.

Purpose of the Study:

  • To review recent advancements in calcium-based catalysts for polyester synthesis.
  • To focus on the application of these catalysts in ring-opening polymerization (ROP) and ring-opening copolymerization (ROCOP).
  • To highlight the use of bio-sourced cyclic substrates in these polymerization processes.

Main Methods:

  • Catalytic ring-opening polymerization (ROP) of cyclic monomers.
  • Catalytic ring-opening copolymerization (ROCOP) of cyclic monomers.
  • Utilizing calcium-based catalysts for these polymerization reactions.

Main Results:

  • Calcium catalysts are effective for the controlled synthesis of polyesters.
  • These catalysts enable ROP and ROCOP of bio-sourced cyclic substrates.
  • Calcium's abundance, low cost, and biocompatibility make it an attractive catalytic metal.

Conclusions:

  • Calcium-based catalysts represent a promising and sustainable approach for producing polyesters from renewable resources.
  • ROP and ROCOP using calcium catalysts offer precise control over polyester properties.
  • This strategy contributes to the development of biodegradable and functional materials.