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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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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 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,...
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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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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Computational Chemistry

Background:

  • Polyampholytes are polymers with both positive and negative charges.
  • Their conformational behavior is complex and influenced by charge distribution.
  • Understanding sequence-charge correlations is key to predicting structure.

Purpose of the Study:

  • To develop a scaling theory for statistical polyampholytes.
  • To investigate the influence of sequence correlations (charge blockiness) on polymer conformation.
  • To provide a framework for understanding synthetic polyampholytes and intrinsically disordered proteins (IDPs).

Main Methods:

  • Development of a scaling theory for statistical (Markov) polyampholytes.
  • Analysis of the competition between short-range attractions and long-range Coulomb repulsions.
  • Validation using molecular dynamics simulations.

Main Results:

  • Increased charge patchiness leads to stronger attractions but higher charge imbalance.
  • Chain conformations (globular, pearl-necklace, stretched) depend on the average block length of like charges.
  • Sequence controls necklace structure and charge distribution, with charge migration observed for long blocks.

Conclusions:

  • A theoretical framework is established for sequence-dependent polyampholyte conformations.
  • Charge correlations and blockiness are critical determinants of polymer structure.
  • Findings are relevant for synthetic polymers and biological macromolecules like IDPs.