Abstract
Abstract Some three-component phenolic block copolymers have been prepared from the following three monomeric units: p-amino-phenol, p-chlorophenol, and p-creso1. Homopolymerization of these monomers has been done with formaldehyde in the presence of acid catalyst. The homopolymer samples were then condensed together with stoichiometric quantities of formaldehyde and acid catalyst. Several samples of the copolymers were also prepared by changing the composition of the feed during homopolymerization. Composition, DP, and the average number of a particular monomeric uhit in a block of a copolymer chain has been deduced from electrometric titration curves of the copolymers in nonaqueous media. Simultaneous copolymerization of three different monomer species may give rise to a copolymer whose composition will depend on the relative reactivity of the monomers. In normal copolymerization the different monomers alternate in the chain either in a more or less regular or in a completely random manner. Some prelimi...
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