Showing papers by "Nicholas A. Peppas published in 1974"
TL;DR: In this article, polydimethylbenzylenes have been obtained by polycondensation of the monochloromethyl derivatives of p-xylene via an acid-catalyzed reaction in anhydrous acetic acid and 1-nitropropane.
Abstract: Polydimethylbenzylenes, , have been obtained by polycondensation of the monochloromethyl, acetoxymethyl, and methoxymethyl derivatives of p-xylene, via an acid-catalyzed reaction in anhydrous acetic acid and in 1-nitropropane In the highly ionizing solvent acetic acid, because of ionic depolymerization, chain growth takes the form of an equilibrating polycondensation, of a maximum number-average molecular weight of 2200 In the noninteracting solvent 1-nitropropane, the molecular weight distribution is more random, and soluble polymers of number-average molecular weight up to 3900 are formed The polycondensation reaction in 1-nitropropane is also initiated by perchlorate salts, in support of the suggestion of a “hot carbonium ion” propagation mechanism The results are explained by a cataionic polycondensation reaction, yielding crystalline “living polymers” of high structural purity
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