The correlations between the thermal behavior and the crystal morphology of isotactic propene-pentene copolymers were studied through wide-angle (WAXS) and small-angle (SAXS) X-ray diffraction. Copolymers with pentene concentration lower than 11mol% crystallize in the α form of isotactic polypropylene (iPP) and a concomitant decrease of melting temperature and of the thickness of crystalline lamellae with increasing pentene concentration has been observed. At higher pentene concentrations the trigonal form of iPP crystallizes and a neat increase crystalline lamellar thickness and of the long period, with a slower decrease of melting temperature and crystallinity have been observed. These results have been treated in the general framework of copolymer crystallization theories, using a method proposed by Crist and correlated with the different level of inclusion of pentene co-units in the crystals ofαand trigonal forms. For copolymers with pentene concentration lower than 11mol% pentene co-units are in part incorporated in the crystals of α form. For higher pentene concentrations the decrease of melting temperature coupled with the increase of lamellae thickness with increasing comonomer content is the hallmark of the almost total inclusion of pentene co-units in the crystals of the trigonal form.

Relationships among lamellar morphology parameters, structure and thermal behavior of isotactic propene-pentene copolymers: The role of incorporation of comonomeric units in the crystals / De Rosa, Claudio; Scoti, Miriam; Auriemma, Finizia; Ruiz de Ballesteros, Odda; Talarico, Giovanni; Di Girolamo, Rocco; Cipullo, Roberta. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - 103:(2018), pp. 251-259. [10.1016/j.eurpolymj.2018.04.001]

Relationships among lamellar morphology parameters, structure and thermal behavior of isotactic propene-pentene copolymers: The role of incorporation of comonomeric units in the crystals

De Rosa, Claudio
;
Scoti, Miriam;Auriemma, Finizia;Ruiz de Ballesteros, Odda;Talarico, Giovanni;Di Girolamo, Rocco;Cipullo, Roberta
2018

Abstract

The correlations between the thermal behavior and the crystal morphology of isotactic propene-pentene copolymers were studied through wide-angle (WAXS) and small-angle (SAXS) X-ray diffraction. Copolymers with pentene concentration lower than 11mol% crystallize in the α form of isotactic polypropylene (iPP) and a concomitant decrease of melting temperature and of the thickness of crystalline lamellae with increasing pentene concentration has been observed. At higher pentene concentrations the trigonal form of iPP crystallizes and a neat increase crystalline lamellar thickness and of the long period, with a slower decrease of melting temperature and crystallinity have been observed. These results have been treated in the general framework of copolymer crystallization theories, using a method proposed by Crist and correlated with the different level of inclusion of pentene co-units in the crystals ofαand trigonal forms. For copolymers with pentene concentration lower than 11mol% pentene co-units are in part incorporated in the crystals of α form. For higher pentene concentrations the decrease of melting temperature coupled with the increase of lamellae thickness with increasing comonomer content is the hallmark of the almost total inclusion of pentene co-units in the crystals of the trigonal form.
2018
Relationships among lamellar morphology parameters, structure and thermal behavior of isotactic propene-pentene copolymers: The role of incorporation of comonomeric units in the crystals / De Rosa, Claudio; Scoti, Miriam; Auriemma, Finizia; Ruiz de Ballesteros, Odda; Talarico, Giovanni; Di Girolamo, Rocco; Cipullo, Roberta. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - 103:(2018), pp. 251-259. [10.1016/j.eurpolymj.2018.04.001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/721394
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