AbstractPolyethylene piperazine‐1,4‐dicarboxylate, a polyurethane which structurally resembles the polyester, polyethylene terephthalate, was prepared by interfacial polymerization, and the properties of the two polymers, as well as the alternating copolymer of the two structures, are compared. Information on the molecular weight and molecular weight distribution of the polyurethane is presented, and a mechanism for the thermal decomposition observed is proposed. A series of copolymers of polyethylene piperazine‐1,4‐dicarboxylate with high melting polyamides was prepared by reacting piperazine with mixtures of ethylene bischloroformate with adipoyl, terephthaloyl, and bibenzoyl chlorides and data on crystalline melting points, solubility, and water absorption are given. It is concluded that the adipamide and terephthalamide copolymers with the polyethylene piperazine‐1,4‐dicarboxylate exhibited
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