The thermal properties of entire resin and composite materials were analyzed using dynamic mechanical analysis (DMA) with a Q800 system (TA Instruments Co Ltd., New Castle, DE, USA) in the dual cantilever beam mode. The temperature was increased from 20 °C to 250 °C at a ramp rate of 5 °C/min. The DMA measures the storage and loss moduli as functions of temperature. The glass transition temperature of the materials was determined from the tan delta peak.
Q800 system
Manufactured by TA Instruments
Sourced in United States
The Q800 system is a dynamic mechanical analysis (DMA) instrument designed for the measurement and characterization of the viscoelastic properties of materials. It provides accurate and precise data on the storage modulus, loss modulus, and tan delta of various solid and semi-solid materials across a wide temperature and frequency range.
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Lab products found in correlation
4 protocols using q800 system
1
Thermal Properties Analysis of Resins and Composites
2
Mechanical Characterization of PA and Silicone Gels
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The elastic moduli of PA and silicone gels were measured by DMTA on a Q800 system (TA Instruments). PA gels were cast into Teflon molds of 10 mm in diameter and 3.5 mm in depth between two Sigmacote-treated cover glasses. Silicone gels were cast into agarose molds of 10 mm in diameter and ~3.8 mm in depth and cured as above. Mechanical tests were conducted by compressing the gel samples between two compression clamps along the axes of cylindrical samples with forces slowly ramping up. Vegetable oil was used between gel samples and compression clamps to prevent adhesion. Elastic moduli were calculated from the slope of the stress-strain curves from 7.5 to 12.5% strain. The storage moduli and loss moduli of silicone gels were measured using a DHR3 rheometer (TA Instruments). Silicone gels were cast in molds that were 20 mm in diameter and 2 mm in thickness and cured as above. Samples were loaded between two parallel plates and then sheared by the parallel plates at a frequency of 6.3 rad/s.
3
Tensile Properties of Membrane Samples
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Dumbbell-shaped samples were cut from membranes by a CP-25 sheet-punching machine (Creator, China). These samples were placed in a ZP (H) 32 chamber (Cincinnati Sub-Zero, USA) at 23 °C and 50% RH for 48 h before test, according to ASTM D882. The stress–strain curves were obtained by the tensile test on a Q800 system (TA Instruments, USA), at the speed of 5 mm min−1. The gauge length and the width of the samples were 30 and 5 mm, respectively.
4
Polymer Viscosity Measurement via DMA
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Viscosity curve of polymer samples was determined through unidirectional cylindrical compression model via a DMA system working in linear deformation mode22 (link). DMA measurements were performed on few-millimeter-thick and 10 mm diameter cylindrical samples using a TA Instruments Q800 system in parallel plate configuration. The thickness of the sample was then monitored when heated at a 2 °C/min rate from Tg—20 °C up to an upper-temperature limit. This upper limit depends on the considered material and was the temperature at which full deformation of the sample occurred. The viscosity η is calculated from Eq. (2)22 (link): where l(t) (in m) was the sample thickness at a given time t, V (in m3) the sample volume, α (in K-1) the coefficient of thermal expansion, ΔT(t) (in K) the difference between room and the measurement temperature at a given time t and dl/dt (in m/s) the axial deformation rate. Note that the experiments were carried out with a constant loading force F = 2.0 N.
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