RHEOMETRIC SCIENTIFIC

Dynamic Mechanical Thermal Analyzer (DMTA) c 10-" -2 X 10" 10 -10" Rheometric Scientific, Inc., Piscataway, N.J. 

The Rheometric Scientific RDA II dynamic analy2er is designed for characteri2ation of polymer melts and soHds in the form of rectangular bars. It makes computer-controUed measurements of dynamic shear viscosity, elastic modulus, loss modulus, tan 5, and linear thermal expansion coefficient over a temperature range of ambient to 600°C (—150°C optional) at frequencies 10 -500 rad/s. It is particularly useful for the characteri2ation of materials that experience considerable changes in properties because of thermal transitions or chemical reactions. 

Rheometric Scientific markets several devices designed for characterizing viscoelastic fluids. These instmments measure the response of a Hquid to sinusoidal oscillatory motion to determine dynamic viscosity as well as storage and loss moduH. The Rheometric Scientific line includes a fluids spectrometer (RFS-II), a dynamic spectrometer (RDS-7700 series II), and a mechanical spectrometer (RMS-800). The fluids spectrometer is designed for fairly low viscosity materials. The dynamic spectrometer can be used to test soHds, melts, and Hquids at frequencies from 10 to 500 rad/s and as a function of strain ampHtude and temperature. It is a stripped down version of the extremely versatile mechanical spectrometer, which is both a dynamic viscometer and a dynamic mechanical testing device. The RMS-800 can carry out measurements under rotational shear, oscillatory shear, torsional motion, and tension compression, as well as normal stress measurements. Step strain, creep, and creep recovery modes are also available. It is used on a wide range of materials, including adhesives, pastes, mbber, and plastics. 

Canada,National Research Council Rheometric Scientific Inc. 

RDAII Dynamic Analyzer C 10-6-500d 102-10s Rheometric Scientific... 

The authors thank Mrs. Kathy Lynn Lavanga, Rheometrics Scientific, Dr. Larry Judovits, Elf Atochem North America, Mr. Shih-Chien Chiu, Polytechnic University, and Dr. James S. Holton for proofreading and for providing corrections and figures. 

Tensiometer with Wilhelmy plate (Figure D3.6.1 available from Lauda, Kruss, or Rheometric Scientific)... 

Tel. 09287-881-0, Fax -44, at ngb.netzsch.com, www.ngb.netzsch.com Perkin-Elmer Instruments, 710 Bridgeport Ave, Shelton CT 06484-4794, USA, Perkin-01-203-925-4600, Fax -4654, www.perkinelmer.com, info perkinelmer.com Elmer Rheometric Scientific, Inc. One Possumtown Road, Piscataway NJ 08854, USA, Rheometric 01-732-560-8550, Fax 7451, www.rheometricscientific.com,www.rheosci.com. Scientific (formerly Omnitherm PL)... 

Rheology Rheological measurements were performed at 25°C with an ARES 2 KFRT controlled strain rheometer (Rheometric Scientific). For the measurements parallel plates of 50 mm diameter were used. The gels were loaded between the plates (2-mm gap) and allowed to rest for 3 min. A strain sweep (0.1 to 100%) was performed at 1 Hz frequency to determine the range of viscoelasticity for each sample and a 2% strain was selected for all samples. A frequency sweep test (0.1 to 16 Hz) was then performed. Samples of 30 and 50% s/w concentration could not be analyzed because of the difficulty in obtaining samples of proper and constant geometry. 

Rheometrics-Scientific (1990) Understanding Rheological Testing - Thermoplastics, Piscataway, NJ Rheometrics Inc. 

While dynamic mechanical and steady shear measurements are frequently used in rheology studies of surfactant systems, extensional viscosity measurements are lacking. This can be attributed to the difficulties associated with such measurements and the lack of commercial laboratory instrumentation since the discontinuance of the Rheometric Scientific RFX rheometer. For many detergent compositions, the relatively low viscosity further complicates such measurements. There appear to be very few data on extensional or elongation viscosity for detergent consumer products and actives in the technical literature at this time. 

For dynamic mechanical and steady shear measurements, the Rheometric Scientific RFSII rheometer was used equipped with the sensitive range force rebalance transducer and couette geometry or parallel plate tooling. 

Small deformation dynamic mechanical analysis on compressed or blown fdms was done using a Rheometrics Scientific RSA II Solids Analyzer. Samples were tested using an initial applied force of 150 grams, an applied strain of 0.1%, and were heated from -100°C to 200°C at 10°C/min. A triplicate set of tests were performed for each samples... 

Dynamic torsional shear experiments were conducted on a Rheometric Scientific ARES rheometer. The samples were cut 6.35 cm in length strips, 0.30 cm thick. The single frequency temperature ramp test was taken at 1 Hz from -100°C to 150°C at 2°C/min in the linear strain regime (0.01 to 2.00%). 

Fig. 7.13 The Rheometrics Solids Analyser RSA III. (a) A schematic diagram of the control system, (b) The oven doors are shown open with the oven drawn aside and a sample is shown ready for a bending test. (Courtesy of Rheometric Scientific GmbH.)...

Motivated by the above related circumstances, we set out to compare all currently available viscoelastics on the German market using Advanced Rheometric Expansion System (Fig. 31 ARES) and RMS 800 (Rheometric Scientific Inc., Piscata-way, USA) as our measuring systems with regard to their physicochemical pro-... 

Figure by Rheometric Scientific, Polymer Laboratories GmbH)... 

---