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Radical Chain-Growth Polymerization: Mechanism01:09

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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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Near-infrared-driven photothermal atom transfer radical polymerization.

Martyna Cybularczyk-Cecotka1, Filip Bandalewicz1, Wiktor Lewandowski1

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Summary

This study introduces a novel photothermal method using gold nanobipyramids to control radical polymerization under aerobic conditions. This nanotechnology approach overcomes limitations of traditional photo-polymerization for advanced material synthesis.

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Area of Science:

  • Polymer Chemistry
  • Nanotechnology
  • Materials Science

Background:

  • Reversible-deactivation radical polymerization (RDRP) offers control over polymer synthesis.
  • Photo-ATRP and photo-RAFT are common RDRP methods but limited by UV light and oxygen sensitivity.
  • Biological applications require polymerization methods compatible with aqueous, aerobic conditions.

Purpose of the Study:

  • To develop a photothermal method for controlled ATRP and RAFT polymerization in aqueous media under aerobic conditions.
  • To utilize gold nanobipyramids (NBPs) for localized heating upon near-infrared (NIR) light irradiation.
  • To overcome limitations of existing photo-RDRP techniques for broader applications.

Main Methods:

  • Gold nanobipyramids (NBPs) were synthesized and their morphology tuned for efficient photothermal conversion.
  • Near-infrared (NIR) light irradiation (780 nm) of NBPs generated localized heating.
  • A water-soluble azo initiator (AAPH) was used to initiate polymerization upon photothermal heating.
  • Controlled ATRP of OEOMA500 and photo-RAFT polymerization of various monomers were performed in aqueous solution under air.

Main Results:

  • The photothermal approach enabled well-controlled ATRP and RAFT polymerization in aqueous solution under aerobic conditions.
  • NIR light irradiation of NBPs efficiently triggered radical generation and polymerization.
  • The photothermal ATRP demonstrated excellent temporal control with rapid on/off switching via NIR light modulation.
  • The method was versatile, successfully polymerizing different monomer classes using both ATRP and RAFT.

Conclusions:

  • A robust, nanotechnology-enabled photothermal approach for RDRP in aqueous media under aerobic conditions was established.
  • This method overcomes key limitations of traditional photo-RDRP, such as UV light dependence and oxygen sensitivity.
  • The developed technique opens new avenues for advanced materials synthesis and high-throughput applications.