Was tut sich in den Laboren von Universitäten oder F&E-Abteilungen der Unternehmen? In exklusiven Publikationen teilen Wissenschaftler aus aller Welt ihre aktuellen Erkenntnisse.
Novel Polyvinyl Alcohol/Barium Titanate Nanocomposites modified by Ionic Liquid
Polyvinyl alcohol (PVA)/barium titanate (BaTiO3) nanocomposites were fabrica- ted with various content of BaTiO3 be- fore and after the treatment of BaTiO3 nanoparticles with ionic liquid.Weiterlesen...
Changes in heat resistant properties of LLDPE by gamma ray pre-irradiation evaluated by weight change
The activation energy of the induction period was 136 kJ/mol which was independent on the concentration of antioxidant reagent. Gamma ray pre-irradiation of 320 kGy caused the induction period to disappear. The period when weight of the sample decreased to 99.0% by thermal aging was presupposed as an index of life time. The pre-irradiation caused a reduction of the life time of LLDPE to the half period of time.Weiterlesen...
Deformation Analysis of Cord-Rubber Compensator
Deformation and stresses in a cord-rubber compensator subjected to internal pressure were analyzed. Two finite element models were developed: shell one with composite elements and axisymmetrical one with rebar elements, within which compensator-flange contact was taken into account. The influence of geometric non-linearity and inhomogeneous orthotropy on displacements and stresses in the compensator layers was investigated. A strong nonlinearity of the structure and a significant impact of inhomogeneous orthotropy on stresses were found. The axisymmetric model enables easy contact definition and high numerical stability in the range of over-nominal internal pressure values.Weiterlesen...
Wie Polymere in der Erdumlaufbahn entwickelt werden
Das Technologische Institut für Kunststoffe, Aimplas, Valencia, Spanien, partizipiert an einem Projekt der Europäischen Weltraumorganisation (ESA) zur Entwicklung neuer Materialien unter Mikrogravitationsbedingungen in der Erdumlaufbahn.Weiterlesen...
Frictional Behavior of self lubricated biocompatible polymeric Materials
The main objective of this work is to study the effect of adding vegetables oils into high density polyethylene (HDPE) on the frictional behavior of the composite. Vegetables oils were added in 2, 4, 6, 8 and 10 wt. % content. The proposed composites are planned to be used in hip or knee joint to reduce friction and wear of HDPE free of oil.Weiterlesen...
The incorporation of AP into silica and the further reaction of Sil-AP with BG results in the introduction of organic networks composed of AP and BG on silica
Silica-filled NR compounds with high silica content were prepared using wet masterbatch (WMB) composed of NR latex and organic-networked silica (ONS). The hydrophobic ONS containing organic connecting bonds is considered very feasible for the production of ONS-NR WMB with high silica yields (>99%).Weiterlesen...
Complex media hoses made of rubber
Projectile injection technology (PIT) allows to produce hollow parts in a highly automated injection moulding process and is used successfully in thermoplastics processing [1;2]. Therefore, the projectile is forced with help of a fluid (e.g. water) into the cavity, which is filled with the moulding material and due to the mass displacement, the wall area is formed.Weiterlesen...
In the present work, the polymeric materials, polytetrafluoroethylene (PTFE) were used as filling materials
In the present work, the polymeric materials, polytetrafluoroethylene (PTFE), polymethylmethacrylate (PMMA) and polyethylene (PE) were used as filling materials in calcium-based greases with different contents 5, 10 and 15%.Weiterlesen...
So verhält sich Polyethylen in der Umwelt
Ein interdisziplinäres Forscherteam der Universität Bayreuth hat erstmals den fortschreitenden Abbau von Polyethylen in der Umwelt erforscht. Zerfallsprodukte würden demnach häufig nicht als Nanoplastikteilchen in Erscheinung treten – sie suchen Anschluss.Weiterlesen...
Effect of Copper Powder on the frictional and electrostatic Properties of Epoxy Flooring Materials in dry Working Condition
Industrial and consumer products are manufactured with a wide range of metals including Fe, Cu, and others. One of the main disadvantages of subtractive manufacturing is the huge amount of chip material waste.Weiterlesen...