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Related Concept Videos

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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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

Cationic Chain-Growth Polymerization: Mechanism

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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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Self-Assembly Methods Induce Different Individual-Polymer-Block Solvation Responses.

Pía A López1, Or Eivgi1, Nehal S Idris1

  • 1Chemistry Department, University of California, Irvine, CA, 92797-2025, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 1, 2025
PubMed
Summary
This summary is machine-generated.

Different processing methods alter how block copolymer assemblies respond to solvents. Fluorescence lifetime imaging microscopy (FLIM) reveals processing-induced changes in block-specific solvent responses, aiding responsive material design.

Keywords:
block copolymerfluorescence lifetime imaging microscopyring‐opening metathesis polymerizationself‐assemblystimuli‐responsive materials

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Understanding block-specific responses to stimuli in self-assembled copolymers is crucial for designing effective responsive materials.
  • Post-reaction processing methods significantly influence the behavior of block copolymers.

Purpose of the Study:

  • To investigate how different post-reaction processing methods affect the block-specific solvent responses of ROMP block copolymers.
  • To develop and apply fluorescence lifetime imaging microscopy (FLIM) for in situ characterization of these responses.

Main Methods:

  • Utilized fluorescence lifetime imaging microscopy (FLIM) with viscosity-sensitive fluorescent molecular rotors to probe block-specific assembly changes.
  • Employed differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) to analyze solid-state properties.

Main Results:

  • Materials processed via rapid precipitation exhibited tighter assembly and reduced block-specific solvent response, indicating disrupted core-shell structures.
  • FLIM data revealed processing-induced alterations in the tightness/looseness of individual blocks within the copolymer assembly.
  • DSC and SAXS confirmed enhanced long-range interactions and order in kinetically trapped states.

Conclusions:

  • Processing methods critically impact the solvent-triggered assembly and disassembly behavior of block copolymers.
  • FLIM is a powerful tool for identifying block-specific stimuli-responsive behaviors influenced by material processing.
  • These findings offer a pathway for tailoring the responsive properties of self-assembled materials.