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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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.
Many natural and synthetic polymers are produced by...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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 species into the...

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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Anomalous Liquid-Liquid Phase Separation Dynamics in Polymerization-Driven Complex Coacervation.

Samiksha Shrivastava1, Shensheng Chen1

  • 1Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

ACS Macro Letters
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

Polymerization-driven liquid-liquid phase separation (LLPS) kinetics were computationally studied. This research reveals a two-stage domain growth law, significantly faster than previously predicted models.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Liquid-liquid phase separation (LLPS) is crucial for biological processes and biomaterial development.
  • The kinetic pathways and domain growth laws governing polymerization-driven LLPS are not well understood.

Purpose of the Study:

  • To computationally investigate the dynamics of LLPS in polymerization-driven polyelectrolyte complex coacervation.
  • To elucidate the kinetic pathway and domain growth law during polymerization-driven LLPS.

Main Methods:

  • Computational modeling of polyelectrolyte complex coacervation.
  • Analysis of LLPS dynamics with changing macromolecular charge asymmetry and polymer connectivity during polymerization.

Main Results:

  • Identified a two-stage kinetic pathway for domain growth, L(t).
  • Observed exponential growth L(t) ~ exp(t) in the early stage due to polymerization-driven collapse.
  • Found near-linear scaling L(t) ~ t in the later stage, driven by polymerization-coarsening coupling.

Conclusions:

  • Polymerization-driven LLPS exhibits significantly accelerated domain growth kinetics compared to classical theories (L(t) ~ t^(1/3)).
  • The study provides new insights into the fundamental mechanisms governing LLPS in complex polymer systems.