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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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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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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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Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
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Structures of Carboxylic Acid Derivatives01:28

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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Precise Acid Copolymer Exhibits a Face-Centered Cubic Structure.

C Francisco Buitrago, Kathleen L Opper1, Kenneth B Wagener1

  • 1Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States.

ACS Macro Letters
|May 17, 2022
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Summary
This summary is machine-generated.

This study reveals precise polyethylene copolymers form ordered cubic structures, demonstrating face-centered cubic packing of acid aggregates. Stretching these polymers induces anisotropic patterns, showcasing molecular precision

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallography

Background:

  • Polyethylene functionalization is key to creating advanced materials.
  • Controlling polymer architecture influences self-assembly and macroscopic properties.
  • Previous studies lacked precise control over functional group placement in polyethylene.

Purpose of the Study:

  • To investigate the self-assembly behavior of precisely functionalized linear polyethylene.
  • To characterize the crystalline packing of phosphonic acid aggregates within a polyethylene matrix.
  • To explore the impact of mechanical deformation on the ordered structure.

Main Methods:

  • Synthesis of linear polyethylene with precisely placed geminal phosphonic acid pendants.
  • X-ray scattering analysis of isotropic films to determine lattice parameters.
  • Mechanical stretching of polymer films to induce anisotropic scattering patterns.

Main Results:

  • The precisely functionalized polyethylene exhibits face-centered cubic (FCC) packing of acid aggregates.
  • Lattice parameters were determined at room temperature (4.19 nm) and above the melting point (4.06 nm).
  • Stretching resulted in anisotropic scattering, indicating two coexisting crystalline orientations with ⟨110⟩ along the stretch direction.

Conclusions:

  • This work reports the first instance of cubic ordering of aggregates in an acid copolymer.
  • The observed ordering is a direct result of the molecular precision in polymer synthesis.
  • The findings open avenues for designing novel self-assembling polymer materials with controlled architectures.