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Title

Dependence of phase transitions on composition in isotactic poly(propylene-co-1-pentene-co-1-hexene) terpolymers

AuthorsGarcía-Peñas, A. ; Gómez-Elvira González, José Manuel ; Cerrada, María L. ; Pérez, Ernesto
Issue Date2016
PublisherRoyal Society of Chemistry (UK)
CitationRSC Advances 6: 82907-82915 (2016)
AbstractDifferent crystalline lattices are found to be developed in isotactic poly(propylene-co-1-pentene-co-1-hexene) terpolymers (synthesized by using a metallocene catalytic system) depending on: (a) overall content in comonomers, (b) 1-pentene/1-hexene ratio, and (c) crystallization and recrystallization conditions. The various polymorphs (monoclinic, orthorhombic, mesomorphic and trigonal crystallites) can be either the unique crystalline form present in the resulting terpolymer specimen or can coexist with other crystalline lattices. The knowledge of the experimental conditions for obtaining a certain modification or for its transformation into another ordered phase is of a significant relevance because of the importance for tuning final structures, seeking particular properties. The evaluation of these fundamental variables is carried out here by differential scanning calorimetry using broad ranges of cooling rates and subsequent heating. A clear assignment of the crystalline polymorphs is performed by X-ray diffraction using either conventional or synchrotron radiation.
Publisher version (URL)http://dx.doi.org/10.1039/c6ra16575c
URIhttp://hdl.handle.net/10261/153800
DOI10.1039/c6ra16575c
Identifiersdoi: 10.1039/c6ra16575c
issn: 2046-2069
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