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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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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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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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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Gaining Structural Control by Modification of Polymerization Rate in Ring-Opening Polymerization-Induced

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polymerization-induced self-assembly (PISA) is a key method for creating block copolymer nanoparticles.
  • Morphology in PISA is usually tuned by polymer architecture and concentration.
  • Previous research suggests polymerization rate influences PISA morphology.

Purpose of the Study:

  • To investigate catalyst selection for controlling morphology in ring-opening polymerization-induced crystallization-driven self-assembly (ROPI-CDSA).
  • To demonstrate morphology control independent of polymer structure and concentration by varying polymerization rates.

Main Methods:

  • Utilized catalyst selection to modulate polymerization rates in ROPI-CDSA.
  • Compared nanoparticle morphologies formed at different polymerization speeds.

Main Results:

  • Slower polymerization rates resulted in slower self-assembly kinetics.
  • Slower rates led to denser lamellae and more three-dimensional structures compared to faster rates.
  • Faster polymerization created transient non-equilibrium states, initiating self-assembly at longer solvophobic block lengths.

Conclusions:

  • Catalyst-controlled polymerization rate offers a novel strategy for tuning block copolymer nanoparticle morphology in ROPI-CDSA.
  • Morphological outcomes can be modulated independently of polymer composition and concentration.
  • This approach provides enhanced control over nanoparticle structure for advanced material applications.