High-pressure differential thermal analysis of diphenylacetylene

摘要

Polyacetylene is an insoluble conjugated polymer and can be obtained by using conventional Ziegler-Natta catalysts [1-3]. Phenylacetylene having bulky phenyl groups on the acetylene carbons produces an oligomer not exceeding a number average molecular weight of 7500 and insoluble products by use of the Ziegler-Natta catalyst [4, 5]. Catalysts based on Mo and W are effective in the polymerization of monosubstituted acetylene [6]. Disubstituted acetylene such as diphenylacetylene produces an insoluble polymer by use of the WCl6-Ph4Sn or TaCl5-Et3SiH catalyst [7, 8]. These polyacetylene and polyacety-lenes with substituents have attracted much attention as electrical and nonlinear optical materials [9-11]. The application of pressure is well known to influence the structure, property and reaction of substances [12-16], Diphenyldiacetylene and phenylacetylene were polymerized by the reaction under high pressure [17, 18].