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From Entropic to Enthalpic Elasticity: Novel Thermoplastic Elastomers from Syndiotactic Propylene–Ethylene Copolymers
Author(s) -
De Rosa C.,
Auriemma F.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200401968
Subject(s) - materials science , tacticity , copolymer , elasticity (physics) , elastomer , thermoplastic elastomer , ethylene propylene rubber , polymer chemistry , rubber elasticity , ethylene , polymer , polymer science , composite material , organic chemistry , polymerization , catalysis , chemistry
Syndiotactic propylene–ethylene copolymers show entropic or enthalpic elasticity depending on ethylene concentration (see Figure). Enthalpic elasticity is due to a reversible transition between transplanar and helical polymorphic forms during stretching, and allows maintenance of elasticity even for highly crystalline materials.