Abstract
Trans-2-methyl-1,3-pentadiene has been polymerized to a crystalline 1,4- cis polymer using the catalytic system TiCl 4AIR 3, and to a crystalline 1,4- trans polymer using the system Ti (OR) 4VCl 3AIR 3. The activity of other catalysts generally used for diene polymerization is disturbed by the high cationic reactivity of the trans-2-methyl-1,3-pentadiene. Polymerization yields then an amorphous 1,4- trans polymer. The polymers have been characterised by their i.r. NMR and X-ray diffraction spectra, as well as by differential thermal analysis. The reactivities of trans-2-methyl-1,3-pentadiene and other dienes have been compared.
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