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Related Concept Videos

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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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Polycatenanes: synthesis, characterization, and physical understanding.

Guancen Liu1, Phillip M Rauscher2, Benjamin W Rawe2

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This review explores polycatenanes, polymers with mechanically interlocked rings. Recent advances in synthesis and understanding structure-property relationships are highlighted for these unique materials.

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Area of Science:

  • Polymer Science and Materials Chemistry

Background:

  • Polymer properties are dictated by chemical composition and architecture.
  • Polycatenanes, featuring mechanically interlocked rings, represent an unusual polymer architecture.
  • Interest in polycatenanes stems from the unique conformational freedom of non-bonded interlocked rings.

Purpose of the Study:

  • To provide a comprehensive overview of the field of polycatenanes.
  • To highlight recent developments in polycatenane synthesis, architecture, and properties.
  • To discuss simulation and modeling approaches for polycatenanes.

Main Methods:

  • Review of existing literature on polycatenane synthesis.
  • Analysis of structure-property relationships in various polycatenane architectures.
  • Exploration of computational modeling and simulation techniques.

Main Results:

  • Development of high-yielding synthetic routes has enabled access to diverse polycatenane architectures.
  • Studies reveal unique physical and material properties arising from the mechanically interlocked structure.
  • Recent progress in understanding the influence of architecture on polycatenane properties.

Conclusions:

  • Polycatenanes offer intriguing possibilities due to their unique mechanically interlocked structure.
  • Continued research in synthesis and property evaluation is crucial for unlocking their potential.
  • This review synthesizes recent advancements, guiding future research directions in polycatenane science.