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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Surface Coassembly of Binary Mixed Polymer Brushes and Linear Block Copolymer Chains.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Binary mixed polymer brushes (BMPBs) are dual homopolymer chains grafted densely onto surfaces.
  • BMPBs exhibit surface phase separation in response to external stimuli.
  • Surface nanostructure fabrication is crucial for advanced material applications.

Purpose of the Study:

  • To demonstrate the fabrication of diverse surface nanostructures via coassembly of BMPBs and free block copolymer (BCP) chains.
  • To investigate the influence of polymer grafting density and solvent on nanostructure formation.
  • To construct a surface phase diagram for morphology control.

Main Methods:

  • Synthesis of polystyrene/poly(2-(dimethylamino)ethyl methacrylate) (PS/PDMAEMA) BMPBs on silica particles using a "grafting to" approach.
  • Surface self-assembly of PS-PDMAEMA-SiO2 particles with PDMAEMA-b-PS BCP chains in methanol.
  • Characterization of surface nanostructures using transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

Main Results:

  • A variety of surface nanostructures, including perforated layers, rods, and spherical surface micelles (s-micelles), were formed.
  • Increasing PDMAEMA grafting density shifted morphology from perforated layers to rods and then to s-micelles.
  • PS grafting density controlled the distribution of s-micelles, from sparse to dense.
  • Solvent and BCP structure also influenced the resulting surface morphology.

Conclusions:

  • The coassembly of BMPBs and BCPs offers a versatile method for creating tunable surface nanostructures.
  • Grafting densities of both polymer types are critical parameters for controlling surface morphology.
  • The developed surface phase diagram serves as a valuable guide for predictable nanostructure fabrication.