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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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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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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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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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Visible-Light Initiated Dispersion Photopolymerization of Styrene.

Rémi Canterel1,2, Jacques Lalevée3,4, Elodie Bourgeat-Lami1

  • 1Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5128, Catalysis, Polymerization, Processes and Materials (CP2M), 43 Bd du 11 novembre 1918, F-69616, Villeurbanne, France.

Angewandte Chemie (International Ed. in English)
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Visible light-initiated polymerization successfully synthesized polystyrene (PS) particles. Optimized conditions yielded larger, narrowly distributed latex particles up to 1.2 μm, a novel achievement in photoinitiated polymerization.

Keywords:
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Dispersion polymerization offers a route to synthesize polymer particles.
  • Visible light-initiated polymerization presents an alternative to traditional methods.
  • Controlling particle size and distribution is crucial for material applications.

Purpose of the Study:

  • To synthesize polystyrene (PS) particles using visible light-initiated dispersion polymerization.
  • To investigate the effect of different photoinitiating systems (PIS) and stabilizers on particle characteristics.
  • To achieve controlled synthesis of large, narrowly distributed latex particles.

Main Methods:

  • Dispersion polymerization of styrene in an ethanol/water mixture under visible light irradiation.
  • Utilized N-heterocyclic carbene borane-based photoinitiating systems (PIS) and disulfide compounds.
  • Employed poly(ethylene glycol) methyl ether methacrylate (PEGMA) and poly(N-vinylpyrrolidone) (PVP) as stabilizers.
  • Investigated the impact of base addition on polymerization kinetics and particle properties.

Main Results:

  • Polystyrene particles ranging from 100 to 350 nm were synthesized with quantitative conversion.
  • Addition of a base improved reproducibility, leading to faster polymerization, narrower size distributions, and larger particles.
  • Using poly(N-vinylpyrrolidone) as a stabilizer resulted in significantly larger particles (up to 1.2 μm) with narrow size distributions.
  • The disulfide-based PIS also produced bigger, narrowly distributed PS particles.

Conclusions:

  • Visible light-initiated dispersion polymerization is effective for PS synthesis.
  • Optimization of PIS and stabilizers, particularly poly(N-vinylpyrrolidone), enables the production of unprecedentedly large latex particles.
  • This method offers a promising route for controlled synthesis of advanced polymer latex materials.