TY - CONF A1 - Jaunich, Matthias A1 - Wolff, Dietmar A1 - Stark, Wolfgang T1 - Low temperature properties of rubber seals - results of component tests N2 - Rubbers are widely used as sealing material in various applications. In many fields the function of seal materials at low temperatures is required. Therefore the understanding of failure mechanisms that lead to leakage at low temperatures is of high importance. Therefore the lower operation temperature limit of rubber seals should be determined in dependence of the material properties. The results of Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) are combined with results of standardized measurements as the compression set according to ISO 815. To reduce the test time of the standard tests a faster and more efficient technique was developed and applied. In addition the breakdown temperature of the sealing function of O-ring seals at low temperatures is measured in a component test setup in dependence of the material and the degree of compression. T2 - 10th Fall rubber colloquium CY - Hannover, Germany DA - 07.11.2012 PY - 2012 SN - 978-3-9814076-1-7 IS - khk2012_jaunich.pdf SP - 1 EP - 8 AN - OPUS4-26995 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaunich, Matthias A1 - Stark, Wolfgang A1 - Wolff, Dietmar T1 - Low temperature - For a seal this depends on the applied material T1 - Tieftemperatur - Bei Dichtungen entscheidet dies der eingesetzte Werkstoff N2 - For many sealing applications rubbers are applied due to their special material properties and easy use. In many applications as e.g. in aviation, traffic or process technology the material can be exposed to low temperatures during Operation. Therefore it is important to know the material behavior at those low temperatures to determine the temperature ränge that allows a safe Operation of the seal. One of our main Interests is to ensure the safe enclosureof dangerous goods under various conditions such as different temperatures and over long periods of time. For low temperatures the seal function of an elastomer is limited by the rubber-glass transition during which the material properties change from rubber-like to stiff and glass-like. For a given application this correlation is not trivial, as the glass-rubber transition covers a broad temperatureregion and is strongly influenced by the applied loading frequency. Therefore the applicability of a seal material has to be assessed by its properties in relation to the application conditions and the necessary level of tightness. To characterize the material and the seal function thermal analysis (Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA)), a modlfied method for the accelerated determination of compression set and component tests were applied to different rubber classes, The results show that the temperature ränge where the compression set values come close to 100 % correlates well with the onset temperature of the storage modulus measured by DMA ata measurement frequency of 1 Hz. An in depth analysis of the compression set data allows an estimation of the expected time- and temperature-dependent recovery behavior. T2 - DKT 2012 - German Rubber Conference CY - Nuremberg, Germany DA - 02.07.2012 PY - 2012 IS - 10-2330_5-L-1530 SP - 1 EP - 4 PB - Deutsche Kautschuk-Gesellschaft CY - Frankfurt am Main AN - OPUS4-26190 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaunich, Matthias A1 - Stark, Wolfgang A1 - Wolff, Dietmar T1 - Material behaviour of static seals at low temperatures N2 - For many sealing applications rubber materials are applied due to their Special material properties and easy use. The crucial advantage of elastomeric seals in comparison to other seal is their high resilience. In many applications as e.g. in aviation, traffic or process technology the material can be exposed to low temperatures during Operation. Therefore it is important to know the material behavior at those low temperatures to determine the temperature ränge that allows a safe Operation of the seal. For low temperatures the seal function of an elastomer is in a way limited by the rubber-glass transition during which the material properties change from rubber-like to stiff and glass-like. This may result in a direct loss of the sealing function but especially for purely static applications a leak tightness well below the rubber-glass transition was observed, For a given application this correlation is not trivial, as the glass-rubber transition covers a broad temperature region and is strongly influenced by the applied load period. Therefore the applicability of a seal material has to be assessed by its properties in relation to the application conditions and the -ecessary level of tightness. T2 - 17th ISC - International sealing conference CY - Stuttgart, Germany DA - 13.09.2012 PY - 2012 SN - 978-3-00-039198-9 IS - A 16 SP - 295 EP - 300 CY - Frankfurt/M. AN - OPUS4-26524 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wolff, Dietmar T1 - Well defined liquid crystalline homo and block copolymerthacrylates synthesized by organolanthanide complexes T2 - Europolymer Conference 1999 (EUPOC '99) Regular Macromolecular Structures Based on the Controlled Polymerization Processes CY - Gargnano, Italy DA - 1999-05-23 PY - 1999 AN - OPUS4-11310 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -