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Related Concept Videos

Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.0K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.8K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.2K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
8.2K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.7K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.7K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.1K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
3.1K

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Updated: Sep 21, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Polymer with Competing Depolymerization Pathways: Chain Unzipping versus Chain Scission.

Partha Sarathi Addy, Manisha Shivrayan, Morgan Cencer

    ACS Macro Letters
    |June 1, 2022
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    Summary
    This summary is machine-generated.

    Researchers developed a polymer with tunable depolymerization. By controlling polymer structure and nucleophile, they achieved stimulus-responsive degradation, unlike traditional chain unzipping, enabling controlled release applications.

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    Area of Science:

    • Polymer Chemistry
    • Materials Science
    • Chemical Engineering

    Background:

    • Triggered depolymerization is crucial for sustainable plastics, self-healing materials, and controlled release systems.
    • Existing depolymerization methods often lack direct correlation between stimulus and degradation rate.
    • A direct, controllable relationship between stimulus and depolymerization kinetics is highly desired for advanced applications.

    Purpose of the Study:

    • To design and synthesize a polymer exhibiting controllable depolymerization pathways.
    • To investigate the competition between nucleophile-induced chain scission (NICS) and chain unzipping mechanisms.
    • To establish structure-property relationships for stimulus-responsive polymer degradation.

    Main Methods:

    • Synthesis of a novel polymer with specific chain end functionalities.
    • Investigation of depolymerization kinetics under varying nucleophile concentrations and types.
    • Formulation of the synthesized polymers into host nanoparticles to demonstrate nanoscale material transferability.

    Main Results:

    • The predominant depolymerization pathway (NICS vs. chain unzipping) is controllable via polymer chain end functionality and nucleophile characteristics.
    • The NICS pathway demonstrates a direct dependence on stimulus concentration, unlike the chain unzipping mechanism.
    • Molecular-level structure-property relationships were successfully translated to nanoscale materials within host nanoparticles.

    Conclusions:

    • A novel polymer system allows for tunable, stimulus-responsive depolymerization by competing NICS and chain unzipping pathways.
    • This control mechanism offers a direct correlation between stimulus and degradation rate, overcoming limitations of previous methods.
    • The findings pave the way for advanced materials with predictable degradation behavior for applications like controlled release and smart materials.