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Related Concept Videos

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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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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Polymer Classification: Crystallinity01:21

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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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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Polymer Classification: Stereospecificity01:26

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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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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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Intermixed Time-Dependent Self-Focusing and Defocusing Nonlinearities in Polymer Solutions.

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Low-power visible light induces nonlinear optical effects in polymer solutions. Researchers modeled light self-focusing and defocusing, enabling novel self-written waveguides and patterns.

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Area of Science:

  • Soft-matter physics
  • Nonlinear optics

Background:

  • Visible light can induce nonlinear optical effects in soft-matter systems.
  • Polymer solutions exhibit either self-focusing or defocusing light propagation based on the solvent.

Purpose of the Study:

  • To model and capture the self-focusing and defocusing nonlinear responses in polymer solutions.
  • To investigate pattern formation in ternary solutions using a combined nonlinear model.

Main Methods:

  • Development of a nonlinear propagation model incorporating local spatial and time-integrating responses.
  • Experimental realization and modeling of pattern formation in ternary polymer solutions.

Main Results:

  • Successfully modeled both self-focusing and defocusing nonlinearities in polymer solutions.
  • Achieved remarkable pattern formation in ternary solutions by combining solvent nonlinearities.

Conclusions:

  • The versatile response of polymer solutions to light offers a new approach for creating self-written waveguides and patterns.
  • The developed nonlinear propagation model accurately captures the observed optical phenomena.