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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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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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Polymer Classification: Stereospecificity01:26

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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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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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Olefin Metathesis Polymerization: Overview01:13

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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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Towards Greener Polymers: Poly(octamethylene itaconate-co-succinate) Synthesis Parameters.

Magdalena Miętus1, Tomasz Gołofit1, Agnieszka Gadomska-Gajadhur1

  • 1Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland.

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Summary

Sustainable, unsaturated resins were synthesized from itaconic acid and other bio-based materials. These renewable polymers show promise for 3D printing applications, offering an eco-friendly alternative to traditional inks.

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design of experimentsitaconic acidmathematical optimization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Growing demand for sustainable polymeric materials in additive manufacturing.
  • Need for eco-friendly alternatives to petrochemical-based inks.
  • Exploration of renewable monomers for polymer synthesis.

Purpose of the Study:

  • Synthesize renewable, unsaturated resins from itaconic acid, 1,8-octanediol, and succinic anhydride.
  • Investigate the influence of synthesis parameters on poly(octamethylene itaconate-co-succinate) (POItcSc) properties.
  • Optimize reaction conditions for desirable resin characteristics for 3D printing.

Main Methods:

  • Melt polycondensation reaction in non-solvent and non-catalyst conditions.
  • Box-Behnken mathematical planning for reaction parameter optimization.
  • Characterization using FTIR, 1H NMR, DSC, TG, DTG, and rheology.

Main Results:

  • Optimal synthesis conditions: 0.50:0.50 itaconic acid molar fraction, 7 h reaction time, 150 °C.
  • High conversion of carboxyl groups (83.3%) and maintenance of C=C bonds (88.7%).
  • Synthesized POItcSc resins are transparent with favorable rheological properties for extrusion-based 3D printing.

Conclusions:

  • Successful synthesis of renewable, unsaturated POItcSc resins via melt polycondensation.
  • Demonstrated tunability of resin properties through controlled synthesis parameters.
  • POItcSc resins present a viable, sustainable alternative for additive manufacturing inks.