Read e-book online Copolymerization: Toward a Systematic Approach PDF

By Cornel Hagiopol

Copolymerization is a really established commercial method, actually the dominant method in macromolecular chemistry. With the arrival of frequent computing energy, this booklet could be very worthwhile either to educational researchers in copolymerization and to researchers in taken with the synthesis of polymers corresponding to plastics, rubbers, chemical fibers, and paints. A disk with 15 computing device courses accompanies the book.

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15. The copolymerization of 2-methyl-5-vinylpyridine (Ml) with acrylonitrile. 2813 and rz. 2933 and rz. 1202 (the KT method). 5 x 10-3) or even results outside the 95% confidence region (Fig. 16). Since the method involves the intervention of the researcher, it is subjective as far as the choice of the reactivity ratios is concerned. Braun et al. 23 (BBM) attempted to make it less subjective. 22) shows that the copolymer composition is mainly determined by r2 at low concentrations ofM! and by r!

Thus, the characteristics of the experiment are incorporated into the method used to estimate the reactivity ratios. 8) and has been applied not only for free-radical copolymerization, but also for ionic copolymerization. 155,166-169 Still despite its improvements, the KT method does not overcome the shortcomings of the linear method: the use of the differential form, and errors that affect both variables. No valid expression for the precision with which the estimates are known can be obtained from the "data" since the "independent" and "dependent" variables in the linear form both contain the observed response (copolymer composition).

The improvements due to the KT method can be illustrated by the extent to which experimental data are fit by the reactivity ratios estimated by it. There are many experimental results 106,170,171 for which the KT method provides, besides the same results after switching indexes, a better fit of experimental data than the FR or YBR method. 12 presents the experimental points for the 2-methyl-5-vinylpyridine (M1)-acrylonitrile (M 2 ) copolymerization. In In this case the distribution of experimental points obviously falls more closely along the straight line.

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