Stereoselective Nature of Graft Copolymers Based on Poly(vinyl chloride): Synthesis of PVC-g-PMMA and PVC-g-PIB

PVC Morphology

“…In this method, by comparing the intensities of two bands, one can obtain an index of tacticity. Martinez 39 explains the increase of dehydrochlorination rate, which is parallel to the increase in syndiotacticity, by easier propagation of polyenes along syndiotactic sequences as compared with their propagation along atactic sequences. 37 The sample preparation method plays an important role here, as can be seen from data in Table 3.3. There is an evident correlation between both sets of data, but the values differ considerably.…”

“…Most frequently used ratios are A615/A690 36 and A1428/A1434. His explanation is based on 39 did not give the number of scissions for virgin polymer. From this and other studies, 38 it is evident that the tacticity index increases when polymerization temperature decreases.…”

Reactions of Polymers

“…The polymeric carbocation initiates polymerization of isobutylene, styrene, tetrahydrofuran, and other monomers [Cai and Yan, 1987;Cameron and Sarmouk, 1990;Kennedy and Ivan, 1992;Martinez et al, 2001;Pi and Kennedy, 2001].…”

Local chain‐configuration dependence of the mechanisms of the chemical reaction of poly(vinyl chloride). IX. Novel results on stereoselectivity of chlorination reaction

“…We have recently pointed out that the modification of PVC by graft reactions through free‐radical and cationic polymerization also proceeds by a stereoselective mechanism in that a fraction of isotactic triads is involved 32. These last results enlarge even more the high significance of a tacticity‐dependent microstructure in the mechanism of an analogous reaction of PVC.…”