The blocky structure of Ziegler–Natta “random” copolymers: myths and experimental evidence†
Claudio
De Rosa, 
*a
Odda
Ruiz de Ballesteros,
a
Rocco
Di Girolamo,
a
Anna
Malafronte,
a
Finizia
Auriemma,
a
Giovanni
Talarico
a
and
Miriam
Scoti
a
*a
Odda
Ruiz de Ballesteros,
a
Rocco
Di Girolamo,
a
Anna
Malafronte,
a
Finizia
Auriemma,
a
Giovanni
Talarico
a
and
Miriam
Scoti
a
Abstract
The crystallization behavior of butene–ethylene random isotactic copolymers prepared with a Ziegler–Natta catalyst, in particular the surprising crystallization of form II of isotactic polybutene in samples with a high ethylene concentration, provides novel evidence of the long-debated blocky molecular structure of these “random” copolymers.
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