Radical Chain Reaction
Radical Chain Reaction - Related Videos
02:35
Free-Radical Chain Reaction and Polymerization of Alkenes
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2025
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. Alkenes undergo polymerization via a free-radical mechanism involving three steps: initiation, propagation, and termination. Radicals are...
10:29
Photochemical Initiation Of Radical Polymerization Reactions
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2023
Source: David C. Powers, Tamara M. Powers, Texas A&M In this video, we will carry out the photochemically initiated polymerization of styrene to generate polystyrene, which is an important commodity plastic. We will learn the fundamentals of photochemistry and use simple photochemistry to initiate radical polymerization reactions. Specifically, in this module we will examine the photochemistry of benzoyl peroxide and its role as a photo-initiator of styrene polymerization reactions. In the...
13:27
PCR: The Polymerase Chain Reaction
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2023
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling – cyles of temperature changes at fixed time intervals. Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dNTPs. There are three steps in PCR: denaturation, annealing, and elongation. Denaturation is the first step in the cycle and causes the DNA to melt by disrupting hydrogen bonds between the bases resulting in single-stranded DNA. Annealing...
01:17
Radical Chain-Growth Polymerization: Chain Branching
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2023
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...
01:29
Chain Reactions
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2026
Chain reactions involve highly reactive transient species, such as atoms or free radicals, as intermediates. These intermediates facilitate rapid reactions over an extended period. The process includes a series of steps: a reactive intermediate is consumed, reactants are converted to products, and the intermediate is regenerated. This cycle enables continuous repetition, amplifying the production of products with a small amount of intermediate. Chain reactions often utilize free radicals as...
FAQs
Initiation sets the radical population that begins the sequence. Heat, light, or a chemical initiator can generate the first reactive species, after which propagation transfers radical character through the reacting mixture. Because this starting step controls whether the chain can begin, changing the initiation conditions can alter the overall reaction behavior.
Propagation sustains the process by converting reactants into products while regenerating a radical. This regeneration links one reaction to the next rather than consuming all reactive species in a single event. Chain length therefore becomes an important analytical concept because it describes how extensively the linked sequence proceeds before radicals are removed.
Termination removes radicals through combination or disproportionation, whereas inhibition is treated as a way to limit or control chain activity. The distinction matters because termination describes how radicals are eliminated, while inhibition describes a control strategy without requiring one specific pathway in this overview. Separating them helps interpret why reaction rates change.
A practical analysis starts by identifying how radicals are initiated, then following the propagation step to see how products and new radicals arise. The final check is termination, including combination or disproportionation, which removes radicals. Examining these stages in order helps researchers interpret the chain and identify where reaction control may be possible.
The mechanism helps explain combustion, halogenation, and polymerization, linking radical behavior to major chemical transformations and materials processing. These applications demonstrate why chemists study more than the individual products: initiation, propagation, termination, and chain length help explain how the reaction proceeds and how processing conditions can be managed.
Atmospheric oxidation is one context in which radical chemistry has environmental significance. Applying chain-reaction concepts allows chemists to consider initiation, propagation, termination, chain length, and inhibition when assessing how radical activity influences environmental systems. These factors provide a framework for interpreting whether radical chemistry can continue and how its effects might be controlled.