Nuevas charlas del grupo de Materiales y Manufactura CIPP-CIPEM


El grupo de Materiales y Manufactura CIPP –CIPEM los invita a las siguientes charlas:

Fecha: Marzo 22 de 2018
Hora: 3:30pm – 5:00pm
Salón: SD 807

Polymeric Foam Processing

In the course of this presentation, a brief overview about application of foams based on the foam density and foam morphology, as well as the classification of different foam types will be given. Further, the scientific background on the physical processes will be discussed. One important part of the overall process is the diffusion and solubility of propellant in the polymer melt, which will be described in detail. Moreover, nucleation and growth of the foam cells followed by the stabilization of the cell structure will be explained. Also, the industrial most significant propellants of physical and chemical types will be presented to the audience. 
Additionally, different production processes will be illustrated. Starting from the discontinuous batch foaming used for e.g. polypropylene foams, followed by continuous foam extrusion. Also, further foaming processes like particle foam production and reactive foaming will be made a subject of discussion. Finally, to round up the presentation, a key mechanical property of compression and the occurring mechanism in foams will be described.

Volker Altstädt - Director de Neue Materialien Bayreuth GmbH @ Universidad de Bayreuth
Es el Director de Neue Materialien Bayreuth GmbH, una institución de I + D del estado bávaro en el campo de materiales y procesos para polímeros, materiales compuestos y metales. Es catedrático de Materiales Poliméricos del Departamento de Ingeniería de Polímeros de la Facultad de Ciencias Naturales Aplicadas (FAN) de la University of Bayreuth, en Bayreuth, Alemania y Jefe de departamento de Ingeniería de polímeros de TuTech Innovation GmbH, en Hamburgo, Alemania. Es graduado en Física y con doctorado (Dr.-Ing.) del departamento de Ingeniería Mecánica de la University of Kassel, en Kassel, Alemania.
Su grupo se dedica a la investigación científica e industrial orientada en el área de materiales poliméricos. Coautor de 5 patentes y de cientos de publicaciones.


25+ Years of Research on PE Plastics Pressure Pipes: Continuous Performance Enhancements towards a Circular Economy

The current methodology for estimating the long-term hydrostatic strength and for classifying of PE-HD pipe materials is based on ISO 9080. The ISO standard extrapolation method (SEM) necessitates test data from pressurized pipe tests of at least two different temperatures to which a multiple linear regression analysis based on the rate process theory is applied. Typical classification tests involve at least 60 pipe specimens, and the test times are in the order of 104 hours.
Over the last two decades, significant advances have been made in understanding the micro-mechanisms and in modelling of material failure in both failure regimes of practical relevance. In Region I of the pipe failure regime, where ductile failure occurs at high hoop-stress levels, two main micro-mechanisms referred two as homogeneous and heterogeneous deformation, respectively, occur. While the former is controlled by alpha relaxation phenomena in the crystal lamella, the latter is governed by sliding of blocks at defective crystal lamella boundaries. In Region II of the pipe failure regime quasi-brittle failure is observed which is controlled by the initiation and slow growth of cracks. To predict long-term pipe failure of modern PE pressure pipe materials in Region II, concepts of fracture mechanics utilizing accelerated cyclic crack growth tests at various R-ratios have been successfully applied. By integrating and combining both of these concepts and approaches, the potential for further reductions in test times for material screening in the development stage and for classifying and certifying novel pipe material grades will be explored. Finally, the presentation will focus on the the merits and limitations of these approaches as to their applicability for assessing the performance of PE recyclate compounds in the context of the aims of a circular economy.

Reinhold W. Lang - Jefe del Institute of Polymeric Materials and Testing (IPMT) @ Johannes Kepler University
Es el Jefe del Institute of Polymeric Materials and Testing (IPMT) de la Johannes Kepler University of Linz, en Linz, Austria. Es graduado en la University of Leoben, en Leoben, Austria, con grado Dipl.-Ing. en Ingeniería y Ciencia de los Polímeros. Obtuvo su Ph.D en la Lehigh University en Estados Unidos. Laboró en la BASF AG, liderando investigaciones en compuestos avanzados, en 1991 se convirtió en Profesor en la University of Leoben y también como Director del Polymer Competence Center Leoben (PCCL). Es autor y coautor de más de 230 publicaciones.
Actualmente se desempeña como Director de Proyectos de la plataforma de proyectos de investigación austriaca SolPol, centrándose en innovaciones relacionadas con polímeros para tecnologías solares.