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

Proc. ESA Annual Meeting on Electrostatics 2008, Paper B3 4C. <strong>Mechanical</strong> TestsStress–strain measurements were done at room temperature in the uniaxial extensionmode <strong>and</strong> along the direction <strong>of</strong> 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 <strong>and</strong> A 0 are the measured force <strong>and</strong> the initial cross-sectional area, respectively.The hardness was measured according to the ASTM D2240 st<strong>and</strong>ard [9] using a durometerModel 408 ASTM type A for applications in s<strong>of</strong>t rubbers, elastomers, <strong>and</strong> flexiblepolyacrylics. Following the st<strong>and</strong>ard, 5 measurements were recorded for each sample<strong>and</strong> the mean <strong>and</strong> the st<strong>and</strong>ard deviation were reported. The objective <strong>of</strong> these tests wasto evaluate the behavior after adding surfactant to the samples.III. RESULTS AND DISCUSSIONA. Eroded mass <strong>of</strong> nan<strong>of</strong>illed specimens using laser testThree samples at each composition consisting <strong>of</strong> either 2.5 or 5 wt % <strong>of</strong> nan<strong>of</strong>iller <strong>and</strong>various Triton additions (expressed in parts per hundred, pph, <strong>of</strong> nan<strong>of</strong>iller by weight)were tested. Each point in Figures 1 <strong>and</strong> 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 <strong>of</strong> nan<strong>of</strong>illerFigure 1: Eroded mass <strong>of</strong> samples with 2.5 wt % <strong>of</strong> different nano fillers for various Triton additions (in pph <strong>of</strong>nan<strong>of</strong>iller). Each data point shown is the average <strong>of</strong> three samples at each Triton concentration.