Rheometric solid analyzer

Mechanical Properties. Dynamic mechanical properties were determined both in torsion and tension. For torsional modulus measurements, a rectangular sample with dimensions of 45 by 12.5 mm was cut from the extruded sheet. Then the sample was mounted on the Rheometrics Mechanical Spectrometer (RMS 800) using the solid fixtures. The frequency of oscillation was 10 rad/sec and the strain was 0.1% for most samples. The auto tension mode was used to keep a small amount of tension on the sample during heating. In the temperature sweep experiments the temperature was raised at a rate of 5°C to 8°C per minute until the modulus of a given sample dropped remarkably. The elastic component of the torsional modulus, G, of the samples was measured as a function of temperature. For the dynamic tensile modulus measurements a Rheometrics Solid Analyzer (RSA II) was used. The frequency used was 10 Hz and the strain was 0.5 % for all tests. 

Mechanical Properties. To reveal the reinforcing effect of liquid crystalline polymer microfibrils on the mechanical properties of the films both their dynamic torsional moduli and dynamic tensile moduli have been studied as a function of temperature using a Rheometrics Mechanical Spectrometer (RMS 800) and a Rheometrics Solids Analyzer (RSA II), respectively. For comparison purpose the modulus of neat matrix polymers and, in some cases, the modulus of carbon fiber and Kevelar fiber reinforced composites has also been measured. 

Viscoelastic behavior can be viewed as three fundamental modulus characteristics G orE =complex modulus, G or E = storage or dynamic modulus, and G" or E" = loss or viscous modulus. The moduli are related by the angle of phase lag 5 in stress-to-strain phase lag. They are derived from measurements of the complex modulus and phase angle 8 relationships of stress to strain, by dynamic mechanical analysis (DMA) using a Rheometric Solids Analyzer, RSA, supplied by TA Instruments [19]. Further information on loss modulus, storage modulus, and DMA is found in Chap. 2, Products and Designs, and Chap. 3, Properties. ... 

RSAII Solids Analyzer C io-3-iood Rheometric Scientific... 

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... 

Dual Cure. Films were prepared for Dynamic Mechanical Analysis (DMA). All films were cast on release paper with a 4.5 mil draw down bar, and partially cured with two 200 watt/inch lamps at half power and a belt speed of 200 ft/min. The films were intentionally under cured to facilitate cutting with minimal flaws. After the films were cut into ii-inch test pieces, they were cured with two 200 watt/inch lamps at 100 ft/min, equal to 260 millijoules/cm dose. The instrument used for the DMA work was a Rheometrics RSA II Solids Analyzer. All tests were made at a frequency of 11 hz with a nominal strain of 0.05%, under nitrogen. Both temperature scans, at 2°C/minute, and isothermal runs were made. 

In 1971, Rheometrics started to publish results on polymer melts and then. solids and built up quite a following with their step isotherm approach, where quite extensive manual adjustment was needed at each temperature. Their RSA. solids analyzer was introduced in the late 1980s, and in 1994 their parent company bought PL Thermal Science Division and hence the PL DMTA and other thermal techniques too. 

Thermal dynamic mechanical analysis (TDMA) was done on a Rheometric Scientific RSA II Solids Analyzer (Piscataway, NJ) using a film testing fixture (5, 6). A nominal strain of 0.1% was us in all cases, with an applied frequency of 10 rad/sec (1.59 Hz). A temperature ramp of 10°C/min was used in all cases. Nominal dimensions of the samples were 6.4 mm x 38.1 mm. The gap between the jaws at the beginning of each test was 23.0 mm. Data analyses were carried out using Rheometrics RHIOS and Orchestrator software. 

A Solids Analyzer RSA II (Rheometric Scientific) was used to measure the storage and loss moduli as a fimction of temperature. The 3-point bend fixture was used to mount the samples and 4 C temperature steps were used. All experiments were performed with a 1 Hz frequency, 0.03% strain, and with static force tracking dynamic force. 

The Rheometric Scientific RDAII dynamic analyzer is designed for characterization of polymer melts and solids in the form of rectangular bars. It makes computer-controlled measurements of dynamic shear viscosity, elastic modulus, loss modulus, tan 8, and linear thermal expansion coefficient over a temperature range of ambient to 600°C (—150°C optional) at frequencies 10-5 —500 rad/s. It is particularly useful for the characterization of materials that experience considerable changes in properties because of thermal transitions or chemical reactions. 

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