Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace: http://hdl.handle.net/2117/13284

Compared structure and morphology of nylon-12 and 10-polyurethane lamellar crystals
Fernández Lopez, Carlos E.; Bermúdez Hermida, Marta María; Alla Bedahnane, Abdelilah; Muñoz Guerra, Sebastián; Tocha, E.; Vancso, J.
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. POL - Polímers
A comparative study of the structure and morphology of nylon-12 and 10-polyurethane (10-PUR) lamellar crystals, was carried out. Lamellar crystals were obtained by isothermal crystallization from diluted solution. Electron diffraction of lamellae combined with WAXS data recorded from crystal sediments indicated that nylon-12 crystallized in either α-form or γ-form according to the solvent chosen for crystallization. The α-form was the crystal modification predominant in doubly oriented films of nylon-12 prepared by epitaxial crystallization. On the contrary, 10-PUR invariably crystallized in α-form regardless crystallization conditions. The α-form of nylon-12 and 10-PUR shared the same crystal structure with hydrogen-bonded sheets made of antiparallel chains and stacked with progressive shifting along both b and c directions. Lamellar crystals of nylon-12 in γ-form and 10-PUR in α-form displayed similar morphological features but only the former appeared to be sensitive to temperature. Upon heating the nylon-12 crystals near to melting, the real-time WAXS analysis evidenced the occurrence of a partial γ-to-α crystal transition, and in situ AFM observations revealed the appearing of more or less regular ridges on the crystal surface. None of these changes were observed in 10-PUR crystals when subjected to similar treatment.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
Linear polyurethane
Nylon-12
Polymer lamellar crystals
Poliuretà
Niló
Polímers cristal·lins laminars
info:eu-repo/semantics/publishedVersion
Artículo
Elsevier
         

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Carvalho, Erica; Alla Bedahnane, Abdelilah; Muñoz Guerra, Sebastián
Japu, Cristina; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Alla Bedahnane, Abdelilah; Jiang, Yi; Loos, Katja; Muñoz Guerra, Sebastián
Bautista, Mayka; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Alla Bedahnane, Abdelilah; Muñoz Guerra, Sebastián
Zakharova, Elena; Alla Bedahnane, Abdelilah; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Muñoz Guerra, Sebastián
Quintana Vicente, Robert; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Alla Bedahnane, Abdelilah; Muñoz Guerra, Sebastián