Isotactic polybutene-1 (iPB-1) exhibits excellent physical, mechanical and chemical properties dependent on its most important polymorphic forms called form I, II and III. The most stable form I is generated via solid-state transformation of the tetragonal, kinetically favoured form II. The slow transformation rate of form II to I accompanied by sample shrink attains its maximum at 25°C and takes 7 – 10 days which is a problem for iPB-1practical applications. Many attempts have been made to prepare the stable form I directly from the melt, or increase the II → I transformation rate but with a low success.
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