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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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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: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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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 skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Structural Difference in Macro-RAFT Agents Redirects Polymerization-Induced Self-Assembly.

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Researchers used reversible addition-fragmentation transfer (RAFT)-mediated polymerization-induced self-assembly (PISA) to create uniform polymeric microspheres and epoxy-functionalized multicompartment block copolymer particles (MBCPs). These particles show promise as Pickering emulsifiers.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polymerization-induced self-assembly (PISA) is crucial for synthesizing block copolymer nano-objects.
  • Narrow molecular weight distributions are typically expected for block copolymers.

Purpose of the Study:

  • To directly compare RAFT-mediated PISA using polymethacrylate and polyacrylate macro-RAFT agents.
  • To explore the preparation of uniform polymeric microspheres and multicompartment block copolymer particles (MBCPs).
  • To evaluate the performance of MBCPs as Pickering emulsifiers.

Main Methods:

  • Photoinitiated RAFT-mediated PISA of 2-hydroxypropyl methacrylate (HPMA) using different macro-RAFT agents.
  • Controlled chain-extension of poly(HPMA) to tune microsphere diameter.
  • Two-step PISA incorporating poly(glycidyl methacrylate) (PGlyMA) for MBCP synthesis.

Main Results:

  • Uniform submicron-sized polymeric microspheres were produced by leveraging the poor RAFT controllability of polyacrylate macro-RAFT agents.
  • Precise control over microsphere diameter was achieved through chain-extension.
  • Uniform epoxy-functionalized MBCPs were successfully synthesized.

Conclusions:

  • This study expands the utility of RAFT-mediated PISA for creating well-defined polymer particles.
  • The findings offer valuable mechanistic insights into RAFT-mediated PISA.
  • The synthesized MBCPs demonstrate potential as effective Pickering emulsifiers.