The cationic polymerization of 3,3-dimethyl-l-butene (t-butyl ethylene) has been investigated. Polymerizations were carried out with AlCl, catalyst in ethyl chloride solvent in the temperature range -31 to -130°C. Trimers (viscous oils or soft gels) were obtained between -31 and -100 "C. The composition and strwture of these materials is complicated and remains obscure. Solid polymer was obtained only a t -130°C. This material, whose degree of polymerization is -68, is a white amorphous powder and it melts between 55 and 66 "C. It is soluble in most common solvents.Careful NMR and I R spectroscopic studies indicate that the repeat structure of this polymer is :
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