DSpace DSpace UPC
  Pàgina principal | Llistar continguts | Cerca avançada | Com participar-hi Català   Castellano   English  


Títol: Synchrotron radiation studies on even-odd and odd-even nylons
Autor: Franco García, María Lourdes
Puiggalí Bellalta, Jordi
Ricart López, Albert
Morales Gámez, Laura Teresa
Soto, David
Altres autors/autores: Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
Editorial: IOP PUBLISHING LTD.
Matèries: Àrees temàtiques de la UPC::Enginyeria química
Synchrotron radiation
Polymers
Sincrotrons
Radiació
Polímers
Tipus de document: Article
Descripció: Aliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd units such as nylons 65 and 56. Consequently, a new structure based on the establishment of intermolecular hydrogen bonds along two different directions was postulated. Real-time temperature dependence of X-ray diffraction patterns for nylons 65 and 56 was studied by synchrotron radiation to gain understanding of the Brill transition usually occurring in polyamides. Significant differences were found between the temperature dependence of both nylons, although a transition towards a monoclinic structure characterized by a single equatorial reflection around 0.425-0.420 nm was observed to occur at high temperatures. This transition was reversible for nylon 65 only. In this case, a characteristic hysteresis effect was found.
Altres identificadors i accés: Franco, M. [et al.]. Synchrotron radiation studies on even-odd and odd-even nylons. "IOP Conference Series: Materials Science and Engineering", 08 Setembre 2009, vol. 14, p. 1-7.
1757-8981
http://hdl.handle.net/2117/11703
10.1088/1757-899X/14/1/012006
Disponible al dipòsit:E-prints UPC
Comparteix:


SFX Query

Tots els ítems dipositats a UPCommons estan protegits per drets d'autor.

 

Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius