Study of Laser Ablation and Mechanical Properties of Silicone ...

Proc. ESA Annual Meeting on Electrostatics 2008, Paper B3 4C. Mechanical TestsStress–strain measurements were done at room temperature in the uniaxial extensionmode and along the direction of increasing elongation. The tensile tester, a Minimat2000, was used following the procedure described in ASTM D1708. For each formulation,5 to 10 samples were tested. The testing speed was 100 mm/min (speed D) [8]. Thestress, σ, was calculated as:fσ =(1)A 0where f and A 0 are the measured force and the initial cross-sectional area, respectively.The hardness was measured according to the ASTM D2240 standard [9] using a durometerModel 408 ASTM type A for applications in soft rubbers, elastomers, and flexiblepolyacrylics. Following the standard, 5 measurements were recorded for each sampleand the mean and the standard deviation were reported. The objective of these tests wasto evaluate the behavior after adding surfactant to the samples.III. RESULTS AND DISCUSSIONA. Eroded mass of nanofilled specimens using laser testThree samples at each composition consisting of either 2.5 or 5 wt % of nanofiller andvarious Triton additions (expressed in parts per hundred, pph, of nanofiller by weight)were tested. Each point in Figures 1 and 2 corresponds to the average eroded mass forthree samples at the different Triton concentrations.5505002.5% nfs2.5% nS2.5% Al2O3450Eroded mass (mg)4003503002502001500 20 40 60 80 100Triton addition by weight in pph of nanofillerFigure 1: Eroded mass of samples with 2.5 wt % of different nano fillers for various Triton additions (in pph ofnanofiller). Each data point shown is the average of three samples at each Triton concentration.