By Cornel Hagiopol
Copolymerization is a truly prevalent business procedure, actually the dominant method in macromolecular chemistry. With the appearance of common computing energy, this ebook might be very invaluable either to educational researchers in copolymerization and to researchers in concerned about the synthesis of polymers comparable to plastics, rubbers, chemical fibers, and paints. A disk with 15 desktop courses accompanies the book.
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Extra resources for Copolymerization: Toward a Systematic Approach
The intersection points are also evaluated. " Consequently, it is possible that another point may be a better fit to the experimental data than any of the intersection points. 4) equals zero. Researchers r; ESTIMATION OF REACTIVITY RATIOS 31 have also minimized the sum of the square distances from the "optimal" point to the lines. 141 Another method was put forward by Joshi and Joshi (JJ)142 which eliminates the subjective element in the selection of the best point of intersection by "statistically" finding the closest point to all experimental lines.
Respective . 4) for one of the data points. Ideally (if there is no error in the determination of the initial and final monomer concentrations), all the lines corresponding to various experiments should pass through a single point, the coordinates of which would represent the real reactivity ratios of the system. Actually, the families of lines do not intersect at one point and the mean values of r 1 and r 2 are usually calculated from the coordinates of all the intersections between the lines composing the same family.
6). Two pairs of reactivity ratios can be obtained by using just one estimation method. The same problem arises as in the case of the intersection method: how to choose of a pair of reactivity ratios. , styrene and 5-ethyl-2-vinylpyridine copolymerization 128). Most authors solve the problem by choosing the pair that best fits the respective monomers according to other copolymerization processes or by association with other estimation methods. 2) shows that even if one has close values for the reactivity ratios obtained by reindexation, their ability to fit the experimental data can be very different.
Copolymerization: Toward a Systematic Approach by Cornel Hagiopol