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The melting and crystallization behaviour of random copolymers of propene with 1-butene, 1-pentene and 1-hexene synthesized with the catalyst system (CH 3 ) 2 Si(2-methylbenz[e]indenyl) 2 ZrCl 2 /methylaluminoxane (MAO) were investigated by differential scanning calorimetry and crystallization analysis fractionation (CRYSTAF). The melting and crystallization temperatures decreased linearly with increasing comonomer content. The depressions of the melting and crystallization temperatures are strongly dependent on the nature of the monomer and are more pronounced for copolymers of propene with 1-hexene than with 1-butene. In comparison to 1-hexene and 1-butene, the incorporation of 1-pentene leads to an intermediate behaviour. This is in contrast to the behaviour of copolymers of propene with longer chain 1-olefins, where the melting and crystallization temperatures are independent of the comonomer type. The depressant effects of the amount of comonomer incorporated on the melting and the crystallization temperatures are equal.

Synthesis and characterisation of propene / higher 1-olefin copolymers with the catalyst system (CH 3 ) 2 Si(2-methylbenz[e]indenyl) 2 ZrCl 2 /MAO