Impact on thermomechanical behaviour of a maleic anhydride grafted ABS on ABS/PC multi-layered blends

The significant increase of Waste Electric and Electronic Equipment (WEEE) has led to an important research in upgrading recycled engineering plastics by means of a blending technique. In particular, there is an interest in studying the properties of ABS/PC blends, the two most important components of WEEE, at ABS rich compositions, according to the generation ratio of waste [1]. Since ABS and PC are immiscible, the final properties depend to a large extent on the flow-induced morphology [2]. In order to better control the final blend morphology of injection molded samples, we propose a two-step approach: the first step consists in producing pellets with multilayered structure, using a multilayer coextrusion device. During the second subsequent step, the pellets are injection molded, with temperature conditions chosen to minimize the deformation of the created structures. The effect of a compatibilizer, namely, an ABS grafted with maleic anhydride (ABS-g-MA) [3] on the thermomechanical properties and morphology has been investigated

Calcul théorique des intensités de bandes du premier système négatif de l'azote

We présent a détermination of Franck-Condon factors and r-centroids for transitions between high vibrational levels (ν' ≤ 20 and ν" ≤ 17). The wave functions used have been computed by Eido, using empirical potential curves, which satisfy the quantisation of Rydberg's action and the experimental value of the rotational constant.Nous présentons ici une détermination de facteurs de Franck-Condon et de r-centroïds, pour des transitions entre niveaux de vibration élevés (ν' ≤ 20, et ν" ≤ 17) ; les fonctions d'onde utilisées ont été calculées par Eido, en se servant d'une courbe de potentiel empirique, satisfaisant à la quantification de l'action de Rydberg, et à la valeur expérimentale de la constante de rotation

Influence of crystallinity on gas barrier and mechanical properties of pla food packaging films

Crystallinity is well-known to have major effects on the gas barrier properties. However, its effect on gas barrier properties is often dependant on the studied material and is difficult to anticipate because two aspects of crystallinity have to be considered: the crystallinity degree and the crystalline morphology. PLA is known to recrystallize when heated at a temperature higher than its Tg ("cold" recrystalllisation). Different recrystallized samples have been obtained by compression-molding the extruded films in different conditions of heating. The crystallinity degree and morphology have been investigated and related to the gas barrier properties of the films. Since crystallinity also affects mechanical properties, the yield strength and the elongation at break have been measured

Revista de psicodidáctica

Resumen basado en el de la publicación. Resumen en castellano e inglésSe presenta el Cuestionario de Autoconcepto Físico (CAF) de nueva creación, tanto en lengua castellana como en euskera, cuyas propiedades psicométricas le hacen adecuado para su aplicación a partir de la preadolescencia. Se trata, al mismo tiempo, de clarificar interrogantes teóricos sobre cuestiones tales como las dimensiones del autoconcepto físico, la relación entre el autoconcepto físico y el desarrollo personal, la práctica deportiva o la ausencia de trastornos de conducta alimentaria, las características de una adecuada intervención educativa para promover el autoconcepto físico.País VascoUniversidad Pública de Navarra. Biblioteca; Campus de Arrosadía; 31006 Pamplona; Tel. +34948169060; Fax +34948169069;ES