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In chemistry, initiation is a chemical reaction that triggers one or more secondary reactions. Initiation creates a reactive centre on a molecule which produces a chain reaction . [ 1 ] The reactive centre generated by initiation is usually a radical , but can also be cations or anions . [ 2 ]
An entropic explosion is an explosion in which the reactants undergo a large change in volume without releasing a large amount of heat.The chemical decomposition of triacetone triperoxide (TATP) may be an example of an entropic explosion. [1]
[19] [20] This is explained by the two-step mechanism: and +. Certain cationic polymerization reactions have negative activation energies so that the rate decreases with temperature. For chain-growth polymerization , the overall activation energy is E = E i + E p − E t {\displaystyle \textstyle E=E_{i}+E_{p}-E_{t}} , where i, p and t refer ...
Irgacure 819 (BAPO Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide) is a Norrish type photoinitiator used in polymerization processes like two-photon polymerization. [7] When exposed to light it forms four radicals (2, 3, 5) per decomposed molecule (1), making it highly efficient in initiating polymerization.
In physical chemistry, the Arrhenius equation is a formula for the temperature dependence of reaction rates.The equation was proposed by Svante Arrhenius in 1889, based on the work of Dutch chemist Jacobus Henricus van 't Hoff who had noted in 1884 that the Van 't Hoff equation for the temperature dependence of equilibrium constants suggests such a formula for the rates of both forward and ...
The general form of the Eyring–Polanyi equation somewhat resembles the Arrhenius equation: = ‡ where is the rate constant, ‡ is the Gibbs energy of activation, is the transmission coefficient, is the Boltzmann constant, is the temperature, and is the Planck constant.
Chemistry in dating is important, but it doesn't always come instantaneously. Here's why you shouldn't give up on someone just because you didn't feel a spark right away.
Chemical reactions involving thermal runaway are also called thermal explosions in chemical engineering, or runaway reactions in organic chemistry.It is a process by which an exothermic reaction goes out of control: the reaction rate increases due to an increase in temperature, causing a further increase in temperature and hence a further rapid increase in the reaction rate.