By John de Kock

ISBN-10: 9038627017

ISBN-13: 9789038627014

This significant new study presents the speculation, validation and experimental program of novel model-independent equipment in polymerization. the $64000 publication is oversize, 212pp., Illustrated with equations, graphs, and charts.

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Read Online or Download Chain-Length Dependent Bimolecular Termination in Free Radical Polymerization Theory, Validation and Experimental Application of Novel Model-Independent Methods PDF

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Extra resources for Chain-Length Dependent Bimolecular Termination in Free Radical Polymerization Theory, Validation and Experimental Application of Novel Model-Independent Methods

Example text

15) in which Di is the diffusion coefficient of an iPHU 1 WKH FDSWXUH UDGLXV Rf the reaction and NA Avogadro’s number. g. steric or spin multiplicity effects, is included in the Smoluchowski equation. 15 is the long time limit of the Smoluchowski equation, which assumes that a steady-state concentration has been attained. For polymeric species, the Smoluchowski equation has been used to describe both translational and segmental diffusion processes. The chain-length dependence of termination rate coefficients can be introduced via the diffusion coefficients, via the steric factor p and/or via the capture radius.

First of all, not all of the above kinetic studies can be fully relied upon. Most studies have extracted kt values from ratios of kinetic parameters, which were extracted from a combination of several experimental techniques such as stationary state polymerization in combination with the rotating sector technique. 3). Values of the termination rate coefficient are therefore related to the chain-length distribution of the macroradicals and the comparison of kt data from different experiments is actually not valid.

35 Chapter 2 only were the functional groups terminal polymer chain groups, but the polydispersity of their polymers was very low as well. In the comparison of S-S versus S-L interactions in benzene they obtained the same results as Schnabel and found the rate coefficient of S-S interaction to be twice as high as for S-L interaction, given that the larger chain exceeded a chain length of approximately 102 [103, 183]. 32 for 23 < i < 740 [103]. 29 for 23 < i < 3900 [117]. They also extended their study to the (poorer) solvents cyclohexane and butanone [117, 183].

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Chain-Length Dependent Bimolecular Termination in Free Radical Polymerization Theory, Validation and Experimental Application of Novel Model-Independent Methods by John de Kock


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