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Thermal initiation involves initiating a reaction in the presence of heat, usually at very high temperatures. Heating a reaction can result in radical initiation of the substrate(s). [ 6 ] In the presence of heat, a monomer can self-initiate and react with other monomers or pairs of monomers.
In case of thermal initiation, the N-chloroamines give better yields for pyrrolidines because N-bromoamines are less stable thermally than the corresponding N-chloroamines. [18] In contrast, when the initiation is carried out by irradiation, the N-bromoamines give higher yield for pyrrolidines. [11] [failed verification]
Initiation is the first step of the polymerization process. During initiation, an active center is created from which a polymer chain is generated. Not all monomers are susceptible to all types of initiators. Radical initiation works best on the carbon–carbon double bond of vinyl monomers and the carbon–oxygen double bond in aldehydes and ...
Mechanochemistry (or mechanical chemistry) is the initiation of chemical reactions by mechanical phenomena. Mechanochemistry thus represents a fourth way to cause chemical reactions, complementing thermal reactions in fluids, photochemistry, and electrochemistry. Conventionally mechanochemistry focuses on the transformations of covalent bonds ...
In general, only the initiation step differs from that of the ordinary thermal polymerization of the same monomer; subsequent propagation, termination, and chain-transfer steps are unchanged. [6] In step-growth photopolymerization, absorption of light triggers an addition (or condensation) reaction between two comonomers that do not react ...
Chain initiation is the initial generation of a chain carrier, which is an intermediate such as a radical or an ion which can continue the reaction by chain propagation. Initiation steps are classified according to the way that energy is provided: thermal initiation, high energy initiation, and chemical initiation, etc. Thermal initiation uses ...
The classic view presented by Yasuda [14] based upon thermal initiation of Parylene polymerization is that there are many propagating species present at any given time as shown in Figure 3. This figure shows two different pathways by which the polymerization may take place.
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