Abstract
AbstractPolymerization of 2‐allylnorbornane using TiCl4 catalyst results in a polymer which is 40% insoluble in o‐xylene at 130°C, whereas with TiCl3 catalyst, a polymer with 88% insolubility in o‐xylene at 130°C is obtained. The o‐xylene‐insoluble fractions gave a very high melting point Tm = 355°C. The main features of these polymerizations are low catalyst activity and, in the case of TiCl4 catalyst, competitive isomerization of the monomer. Based on a comparison with the properties of an acyclic analogue, poly(4‐methyl‐1‐pentene), the partly insoluble nature of poly(2‐allylnorbornane) and its high melting point can be attributed to the presence of the bicyclic pendant.
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