Abstract
The mechanical degradation of high polymers by shearing forces has been shown to occur by homolytic and by heterolytic scission. Heterolytic degradation into polymeric free radicals during the mastication of both rubbers and plastomers has been used to synthesize block copolymers. The mastication of high polymers in the presence of multifunctional reagents such as aluminium isopropoxide leads to the formation of crosslinked gel structures. By subjecting suitable blends of two or more polymers to mechanical degradation in the presence of an alkoxide, soluble and crosslinked block copolymers can be synthesized. These reactions are discussed in terms of free radical and ionic mechanisms.
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