Q800 Dynamic Mechanical Analysis - 22 Pages

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Catalogue excerpts

Thermal cover:Layout 1 1/18/11 3:56 PM Page 2

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Dynamic Mechanical ANALYSIS Accurate, Precise, Versatile DMA Measurements

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The Q800 is the world’s best-selling DMA, for very good reason. It utilizes state-of-the-art, non-contact, linear drive technology to provide precise control of stress, and air bearings for low friction support. Strain is measured using optical encoder technology that provides unmatched sensitivity and resolution. With its unique design, the Q800 easily outperforms competitive instruments and is ideal for high-stiffness applications, including composites. Maximum Force Minimum Force Force Resolution Strain Resolution Modulus Range Modulus Precision Tan δ Sensitivity Tan δ Resolution Frequency...

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DMA Deformation Modes & Sample Size Dual/Single Cantilever Tension Film/Fiber Fiber Shear Compression 5 to 30 mm (L), Up to 8 mm (W) and 2 mm (T) 5 to 30 mm (L), 5 denier (0.57 tex) to 0.8 mm diameter 10 mm square, Up to 4 mm (T) 15 and 40 mm diameter, Up to 10 mm (T) Submersion Tension *Lengths are for dual/single cantilever

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Subambient Operation Gas Cooling Accessory The Gas Cooling Accessory (GCA) extends the operating range of the Q800 to -150°C. The GCA uses cold nitrogen gas generated from controlled evaporation of liquid nitrogen. Automated filling of the GCA tank can be programmed to occur after the scan is complete. The GCA will provide ballistic or controlled cooling rates over the entire operating range of the Q800 DMA (-150 to 600°C). In general, the maximum cooling rate is a function of the installed clamp and the thermal characteristics of the sample. The figure below shows the typical range* of controlled...

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Q800 Technology Drive Motor Optical Encoder The Q800 uses a non-contact, direct drive motor to provide the oscillatory or static force required. The motor is constructed of high performance composites that ensure low compliance and is thermostated to eliminate heat build-up even when using large oscillation amplitudes and high deformation forces. Sophisticated electronics enable the motor current to be rapidly adjusted in small increments. The motor can deliver reproducible forces over a wide range and the force can be changed rapidly, enabling a broad spectrum of material properties to be measured. A...

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Low Mass, High Stiffness Sample Clamps Rigid Aluminum Casting Drive motor Optical Encoder

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Dual/Single Cantilever In this mode, the sample is clamped at both ends and either flexed in the middle (dual cantilever) or at one end (single cantilever). Cantilever bending is a good general-purpose mode for evaluating thermoplastics and highly damped materials (e.g., elastomers). Dual cantilever mode is ideal for studying the cure of supported thermosets. A powder clamp is also available for characterizing transitions in powder materials. 3-Point Bend In this mode, the sample is supported at both ends and force is applied in the middle. 3-point bend is considered a “pure” mode of deformation...

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Compression In this mode, the sample is placed on a fixed flat surface and an oscillating plate applies force. Compression is suitable for low to moderate modulus materials (e.g., foams and elastomers). This mode can also be used to make measurements of expansion or contraction, and tack testing for adhesives. Tension In this mode, the sample is placed in tension between a fixed and moveable clamp. In oscillation experiments, the instruments use a variety of methods for applying a static load to prevent buckling and unnecessary creep. The clamps are suitable for both films and fibers. Submersible...

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DMA Accessories DMA-RH The new DMA-RH Accessory allows mechanical properties of a sample to be analyzed under controlled and/or varying conditions of both relative humidity and temperature. It is designed for use with the Q800 Dynamic Mechanical Analyzer. The DMA-RH Accessory is a fully integrated unit and includes the following hardware components: 1. The sample chamber mounts to the DMA in place of the standard furnace. Peltier elements in the chamber precisely control the temperature to +/-0.1°C. The sample chamber accommodates standard DMA clamps (tension, cantilever, and 3-point bending)....

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Hygroscopy is defined as the ability of a substance to attract water molecules from the surrounding environment through either absorption or adsorption. The effect of moisture sorption on the mechanical characteristics of a material can be quantified by the Coefficient of Hygroscopic Expansion (CHE), the constant which relates the dimensional change of a material to a change in the surrounding relative humidity. The data in this figure show the effect of imposed relative humidity on the Nylon 6 sample as measured by the Q800 DMA with the DMA-RH Accessory. As the relative humidity is increased...

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Recent research has focused on alternative fuel technologies including Proton Exchange Membrane Fuel Cells (PEMFC) which contain polymeric membranes such as Nafion* 112.  PEM properties can significantly change as functions of time and exposure to elevated temperatures and humidity, as water is the primary by-product of the electrochemical reaction of the fuel cell.  The Q800 DMA equipped with the DMA-RH accessory is the ideal platform to study the effect of temperature and humidity on the time-dependent processes of the PEM. In this example, the stress relaxation behavior of a Nafion 112 membrane...

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DMA Theory Dynamic Mechanical Analysis (DMA) is a technique used to measure the mechanical properties of a wide range of materials. Many materials, including polymers, behave both like an elastic solid and a viscous fluid, thus the term viscoelastic. DMA differs from other mechanical testing devices in two important ways. First, typical tensile test devices focus only on the elastic component. In many applications, the inelastic, or viscous component, is critical. It is the viscous component that determines properties such as impact resistance. Second, tensile test devices work primarily outside...

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