chain transfer

(redirected from Chain transfer reaction)

chain transfer

[′chān ‚tranz·fər]
(organic chemistry)
The abstraction of an atom from another molecule (initiator, monomer, polymer, or solvent) by the radical end of a growing (addition) polymer, which simultaneously terminates the polymer chain and creates a new radical capable of chain polymerization; also occurs in cationic polymerization.
References in periodicals archive ?
In this case, the NMR analysis identified the formation of morpholine end groups arising from the attack of neighboring hydroxyl groups, which possibly correspond to the main chain transfer reaction.
2002) Enzymatic attachment of glycosaminoglycan chain to peptide using the sugar chain transfer reaction with endo [beta]-xylosidase.
argentatum, negative cooperativity inhibits the chain transfer reaction across a wide range of FPP concentrations, a property possessed in far less degree by H.
Then, the chain transfer reaction of propagating radical with PEPDTA may occur and form dormant chain by addition fragmentation.
Finally, the chain transfer reaction is assumed to occur spontaneously or through the reaction of active chain with hydrogen, monomer, and/or cocatalyst.
Chain transfer reaction does not change the number of total active sites, but changes the number of the active sites with different chain lengths, and we consider only the first-order transfer reaction of active sites and the transfer reaction to monomer.
13] NMR end group analyses of the syndiotactic polypropylenes obtained at 70[degrees]C indicate that the main chain transfer reaction in both 1 and 2 catalysts is a [beta]-hydride elimination reaction [12-16].
The free-radical reactions leading to SCB and LCB and involving polymer growing radicals are in competition either with chain propagation or with chain transfer reaction to a selected added molecule.
In order to study the importance of the chain transfer reaction we also run the model using the kinetic parameters of the reduced mechanism (RM; see Table 6) where the above mentioned reaction is not included.
This initiator was chosen because it does not present chain transfer reaction during polymerization (18).
It has been suggested that the loss in scorch safety is primarily attributed to the elimination of degradative chain transfer reactions as the groups of Type I coagents quickly react with the alkoxy radical and do not possess an allylic hydrogen.
RC-le as a Tool to Monitor Chain Transfer Reactions in Emulsion Polymerization" -- Stacy Stromeyer, Carolina Quintero, David Delatte, James W.