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Títol: Brill transition and melt crystallization of nylon 56 an odd-even polyamide with two hydrogen-bonding directions
Autor: Morales Gámez, Laura Teresa
Soto, David X.
Franco García, María Lourdes
Puiggalí Bellalta, Jordi
Altres autors/autores: Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.
Editorial: Elsevier
Matèries: Àrees temàtiques de la UPC::Enginyeria química
Polyamides
Crystallization
Poliamides
Cristal·lització
Tipus de document: Article
Descripció: Brill transition and crystallization behaviour of nylon 56, a representative polymer of odd–even polyamides, were investigated by simultaneous WAXD and SAXS synchrotron radiation. Nylon 56 crystallized from solution into a peculiar structure where hydrogen bonds were established along the two directions. Nylon 56 experimented on heating a Brill transition that lead to a pseudohexagonal packing and lately to a monoclinic unit cell where neighbouring molecular segments were shifted along the chain axis direction. In disagreement with conventional polyamides, the Brill transition of nylon 56 was not reversible since on cooling the pseudohexagonal arrangement was mainly attained. Optical microscopy studies performed under both isothermal and non-isothermal conditions demonstrated that nylon 56 spherulites had different optical properties than even–even nylons having conventional sheet structures. The birefringence sign changed in the sequence positive–negative–positive when crystallization temperature was decreased.
Peer Reviewed
Postprint (published version)
Altres identificadors i accés: Morales, L. [et al.]. Brill transition and melt crystallization of nylon 56 an odd-even polyamide with two hydrogen-bonding directions. "Polymer", 12 Novembre 2010, vol. 51, núm. 24, p. 5788-5798.
0032-3861
http://hdl.handle.net/2117/10932
10.1016/j.polymer.2010.09.074
Disponible al dipòsit:E-prints UPC
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