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Related Concept Videos

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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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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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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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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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Single-Crystal Polycationic Polymers Obtained by Single-Crystal-to-Single-Crystal Photopolymerization.

Qing-Hui Guo, Manping Jia1, Zhichang Liu2

  • 1Department of Electrical and Computer Engineering, University of California, Santa Cruz, California 95064, United States.

Journal of the American Chemical Society
|February 5, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized single-crystalline polyelectrolyte materials with high proton conductivity using a novel photopolymerization method. This breakthrough enables the creation of robust, stable materials for advanced applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Efficient synthesis of single-crystalline ionic polymers is challenging.
  • Understanding their molecular structure-property relationships is crucial.

Purpose of the Study:

  • To describe the single-crystal structure and proton conductivity of a highly ordered polycationic polymer (polyelectrolyte).
  • To develop a gram-scale, high-yield preparation method for these materials.

Main Methods:

  • Ultraviolet/sunlight-induced topochemical polymerization of a tricationic monomer.
  • In situ single-crystal X-ray diffraction analysis to monitor polymerization.
  • Characterization of polymer structure, stability, and proton conductivity.

Main Results:

  • Gram-scale yield of single-crystalline polyelectrolyte via single-crystal-to-single-crystal photopolymerization.
  • Detailed molecular structure revealed, showing collinear polymer chains in 2D lamellar sheets with sub-nanometer pores.
  • Exceptional thermal ( > 500 K) and photostability (254 nm).
  • Proton conductivity of ~3 × 10⁻⁴ S cm⁻¹.

Conclusions:

  • The study presents a controlled synthesis of single-crystalline polyelectrolytes with perfect tacticity.
  • The material exhibits excellent stability and significant proton conductivity, indicating potential for robust proton-conducting applications.