Compression molding mold instrumentation

Orientation of commercial POM can be carried out using cylindrical samples which are obtained by extruding POM into a thermostatically controlled form. After the form is filled with the melt, it is removed from the extruder and gradually cooled down in a compression-molding press. Cylindrical specimens are then uniaxially stretched in a tensile test instrument at a temperature of 130°C and a stretching rate... 

Ca-stearate (HALS-III, without AO-II). Test specimens compression-molded plates (2.0 mm thick). Weathering test sunshine carbon arc lamp weather meter (WEL-SUN-HC, Suga Test Instruments Co., Ltd.). Black panel temperature 63 3 C, without water spray. Failure criterion time to 507, loss of original elongation (half life time = H.L.T.). IF = H.L.T. with stabilizer/H.L.T. without stabilizer. (b) Test specimens compression-molded sheets (0.5 mm thick). Aging test forced air circulation oven at 150 C. 

Tensile strengths were determined on microdumbbells from about 20-mil thick compression-molded films with an Instron table model instrument at the rate of 2 in./min. 

Note Compression molded specimens were rapidly quenched to the specified quenching temperatures. Relaxation temperatures (tan 5 peaks) were obtained on a DMA instrument at a heating scan rate of l°Cmin . Crystal phase structures were obtained by Raman LAM. Tire degree of aystallinity was determined from the heat of fusion data obtained on a DSC instrument. 

Dynamic Mechanical Analysis and Stress Relaxation Behavior. Samples were compression molded into bars of the dimensions 38.xl2.5x0.78 0.007 mm and 65.x9.7xl.7 0.007 mm in a Carver laboratory hot press model C. A TA Instruments 983 DMA, which was operated in the fixed frequency mode, was used to characterize the storage and loss moduli as a function of temperature. Samples were scanned at fi-equencies from 0.05 to 10.0 Hz over a temperature range from -150 C to above the glass transition temperature. The displacement was 0.4 - 0.6 mm. Stress relaxation curves were determined for the same size samples at a constant strain. The sample was displaced for 10.0 minutes and then allowed to recover for 10.0 minutes. The stress data were taken in five degree increments. A microprocessor controlled Liquid Nitrogen Cooling Accessory (LNCA) was used for sub-ambient operations. 

Dielectric Analysis. Samples of 0.80 0.01 mm thickness were compression molded into disks one inch in diameter. Permittivity, e and the loss factor, e", were determined at temperatures fi om -150°C to 30°C above the glass transition temperature of the samples using a TA Instruments 2970 DBA. The frequency range scanned was from 10" to 10 Hz. 

Micromolding (Injection and Compression Molding), Fig. 6 Images taken of (a) commercial electroforming instrument, (b) wafers containing microfluidic features in holders for electroforming instrument, (c) Ni stamp... 

Minature dumbbell-shaped specimens of each polymer and blend were molded from pieces of compression molded films by means of a Mini-Max Injection Molder (Custom Scientific Instruments) whose operation and mixing characteristics have been reviewed by Maxwell (12), Gauge length of the molded dumbbells was 8.9 mm at a cross-sectional diameter of 0.157 cm. 

A Nicolet 7000 FTIR instrument was used for the infrared studies with 120 scans accumulated for all samples. The materials used for the FTIR study were prepared as follows samples of polymers of low glass transition temperatures which were soluble in THF were prepared by the deposition of a polymer solution onto an NaCl window. For moderately high glass transition temperature polymers soluble in THF, samples were prepared by solution casting onto a glass plate. Thin films of polymer samples insoluble in THF were compression molded at 150 to 200 C (depending on the sample). An FTIR calibration curve was obtained from ethyl acrylate copolymers which had previously been neutralized completely with perchloric acid. This curve was used to determine semiquanti-tively the percent proton transfer in the blends. 

The nanoscale structure of PBA-SS was investigated by means of TEM (Hitachi H-700 instrument), operated at an accelerating voltage of 100 kV. An ultrathin section (the edge of the sample sheet perpendicular to the compression mold) obtained using a diamond knife with a thickness of lOOnm was micro-tomed at 80 °C. 

The TA Instruments AR 2000 rheometer with 25 mm diameter parallel plates was used to determine viscosity of polymers at 200°C. The test specimen was prepared by compression molding at 200°C. The collected viscosity data were used to determine the co-continuous region for the blends using the Jordhamo relationship ... 

The flexural moduli of the compression-molded eco-composite coupons were determined using a TA Instruments Q800 Dynamieal Meehanical Analyzer (DMA) in three-point bending mode with strips cut from the coupois. The test method utilized a temperature ramp from room temperature to 200 °C and a frequency sweep from 0.1 to 100 Hz. A differential scanning calorimeter (DSC, TA Instruments QlOO) was used to eharacterize the thermal properties. 

Extensional viscosity was measured at 170°C on a Sentmanat Extensional Rheometer (SER) fixture (Xpansion Instruments).[1] The SER is based on a dual drum system. It is designed as a fixture of a standard rotational rheometer which consists of a master and slave wind-up dmms coupled via intermeshing gears. A constant Hencky strain rate is obtained simply by setting a constant winding speed. The SER fits inside the environmental chamber of an Advanced Rheometric Expansion System (ARES) rheometer. Tests were carried out on strips cut out of a 0.5 mm thick compression molded sheet. Constant Hencky strain rates (1 and 10 s ) were applied and the time-dependent stress was determined from the measured torque and the sample time-dependent cross-section. The extensional viscosity, tie, was obtained by dividing the stress by the Hencky strain rate. 

Disks with a thickness of 1 mm and a diameter of 60 mm were prepared by compression molding to measure the electrical volume resistivity by means of an electrometer, Kiethley Instrument Model No.6517A, attached to an 8009 test fixture was used. A voltage of lOV was applied for 60 s in the test. 

Small Angle X-ray Scattering (SAXS). SAXS experiments were made with the Bruker Anton-Paar instrument, which included a Rigaku RU-300 rotating anode (Cu Ka radiation 1 = 0.154 nm) and a two dimensional position-sensitive detector. The sample-to-detector distance used was 64.5 cm, and the samples were 1 mm thick compression molded disks. 

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