100 200 300 400 500 600 -20 0 20 40 60 80 100 120 0 5 10 15 20 25 Deviation Weight (%) As received_J3 NaOH_J3 NaOH/(APS+XB)_J3 NaOH/Y9669_J3 Temperature(°C) TG and DTG curves of jute fibrewith different treatments Dynamic Mechanical Analysis (DMA) üDetermines elastic modulus (or storage modulus, G'), viscous modulus (or loss modulus, G'') and damping coefficient (Tan D) as a function of temperature, frequency or time. üResults are typically provided as a graphical plot of G', G'', and Tan Dversus temperature. üIdentifies transition regions in plastics, such as the glass transition, and may be used for quality control or product development. ü Can recognize small transition regions that are beyond the resolution of DSC (Differential Scanning Calorimetry). Scope: -Typically 56 x 13 x 3 mm, cut from the centersection of an ASTM Type I tensile bar, or an ISO multipurpose test specimen. Specimen size: Dynamic Mechanical Analysis (DMA) üThe test specimen is clamped between the movable and stationary fixtures, and then enclosed in the thermal chamber. üFrequency, amplitude, and a temperature range appropriate for the material being tested are input. üThe Analyzer applies torsionaloscillation to the test sample while slowly moving through the specified temperature range. Test Procedure: Is DMA Thermal Analysis or Rheology Ø Definitions Ø Thermal Analysis is the measurement of some characteristic of a substance as a function of temperature or time. Ø Rheology is the science of flow and deformation of matter. Ø DMA is the general name given to an instrument that mechanically deforms a sample and measures the sample response. The deformation can be applied sinusoidally, in a constant (or step) fashion, or under a fixed rate. The response to the deformation can be monitored as a function of temperature or time. Deformation Response Phase angle δ l An oscillatory (sinusoidal) deformation (stress or strain) is applied to a sample. lThe material response (strain or stress) is measured. lThe phase angle δ, or phase shift, between the deformation and response is measured. Dynamic Mechanical Testing Stress Strain δ = 0 δ = 90 Purely Elastic Response (HookeanSolid) Purely Viscous Response (Newtonian Liquid) Stress Strain Dynamic Mechanical Testing Phase angle 0 < δ < 90 Strain Stress Dynamic Mechanical Testing: ViscoelasticMaterial Response DMA ViscoelasticParameters The Elastic (Storage) Modulus: Measure of elasticity of material. The ability of the material to store energy. G' = (stress/strain)cosδ G" = (stress/strain)sinδ The Viscous (loss) Modulus: The ability of the material to dissipate energy. Energy lost as heat. The Modulus: Measure of materials overall resistance to deformation. G = Stress/Strain Tan δ = G"/G' Tan Delta: Measure of material damping -such as vibration or sound damping. Storage and Loss of a ViscoelasticMaterial SUPER BALL TENNIS BALL X STORAGE LOSS . through the specified temperature range. Test Procedure: Is DMA Thermal Analysis or Rheology Ø Definitions Ø Thermal Analysis is the measurement of some characteristic of a substance as a function. NaOH/Y9669_J3 Temperature(°C) TG and DTG curves of jute fibrewith different treatments Dynamic Mechanical Analysis (DMA) üDetermines elastic modulus (or storage modulus, G'), viscous modulus (or loss. ASTM Type I tensile bar, or an ISO multipurpose test specimen. Specimen size: Dynamic Mechanical Analysis (DMA) üThe test specimen is clamped between the movable and stationary fixtures, and then