Sentence examples for propagating chain from inspiring English sources
In all cases, the basicity of the alkoxide at the propagating chain end induces chain transfer.
However, PEOn should be more sterically hindered and possess lower diffusion ability and thus be less efficient at trapping propagating chain radicals, resulting in enhanced polymerization rate.
It is needed to seek an initiator that has specific interaction at a propagating chain end for the formation of six-membered rings.
A computational study was carried out by Fragala and co-workers on catalyst 38 where n-octyl was used to represent a propagating chain and n-propyl was used to represent an oligomeric chain.
Interference of the light absorption of MTPP and/or the active propagating chain end by the MAC itself has been considered as being one possible reason for its slow polymerization, as a result of electron spectroscopy studies.
It can also be accounted for by the fact that more radical radical coupling followed by associated termination is likely to occur under surface polymerization conditions than conventional solution ATRP [25] of the same monomer, due to proximity of the propagating chain ends to each other.
Thermodynamic analysis suggested that the isotactic-specificity was entropically induced, probably due to conformational fixation near the propagating chain-end through coordination by PNO.
On the other hand, in the block copolymerization by the reverse addition of monomer, a well-defined diblock copolymer, poly(1 -block-PMMA, could be synthesized only by the sequential addition of 1 -block-PMMA MMA, whereas the block copolymerizations using 2 and 3 were not successful because of instabilities of the propagating chain-end anions derived from 2 and 3.
The in situ intramolecular cyclization of individual propagating chains was achieved by kinetic control and statistical manipulation of mono- and multi-vinyl monomer copolymerization.
No steady-state polymerization was observed, with a continual increase in the number of propagating chains at all initiator feed rates investigated.
The lower 〈kt〉 for AAm arises due to a combination of the high kp value, promoting rapid formation of slower terminating long chains, and the slow diffusion of short propagating chains, relative to other common monomers.
