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iNuSTEC2019 IOP Publishing IOP Conf. Series: Materials Science and Engineering 785 (2020) 012033 doi:10.1088/1757-899X/785/1/012033 2.5 Differential Scanning Calorimetry (DSC) The miscibility of the blends was investigated by means of differential scanning calorimetry in inert atmosphere. The sample of 4 to 7 mg will be pressed in Aluminium pan and were being heated at a rate of 10oC/min from 25oC to 200oC. The crystallization (Tc) and melting temperature (Tm) had being taken as those corresponding to the peak values of the crystallization exotherms and melting endotherms, respectively. The percentage of crystallinity Xc was calculated using the following equation: %Crystallinity = where, Hm is measured heat fusion, f is the weight fraction of the component in equation, and Hm ideal is the entalphy of fusion for 100% crystalline ( 2.6 Tensile Test Hm (PLA) =288 J/g). Tensile test was carried out according to ASTM D638 (Standard Test Method for Tensile Properties). The tensile properties were measured at environment temperature and humidity on the universal testing machine. The testing was being performed under ambient conditions. The cross head speed was fixed in a value of 50 mm min-1. Five specimens for each formulation were tested and average values will be recorded. 2.7 Hardness Test Hardness test were done according to ASTM D2785 by using Shore D Rockwell Hardness tester. The test was done under ambient conditions. The samples standard dimensions are 6mm. Hardness values were being calculated. Five specimens were tested and the average value was being calculated. 2.8 Impact Test The Izod impact test was carried out according to the ASTM D256 (A) standard test method to determine the pendulum impact resistance of notched specimens for the composites. The testing machine, Izod impact tester consists of a heavy base with a vise for clamping the specimen in place during the test. The samples is in rectangular bar which was held vertically at half of it length and notch according to standard. Five specimens of each formulation will be tested and the average impact strength was calculated. 3. Results and discussion 3.1. Characterization of HDPE 3.1.1. Gel Content. From the graph shown in Figure 3, the degrees of crosslinking were increased with increasing of irradiation dose. From 0% of gel content degree, it is increased up to 70% when being irradiated with electron beam with dose of 50, 100, 150 and 200kGy respectively. This showed that HDPE blends undergo the crosslinking process throughout the irradiation using electron beam. 5 (2)PDF Image | marine grade radiation cross-linked high density polyethylene (HDPE) floater pontoon
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