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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 HDPE150 132.41 66.45 56.78 HDPE200 131.82 65.67 55.97 The Tm value of the HDPE pure is increase in increasing of the irradiation dose but decreasing when being bombarded with 200kGy. For the Tg, the Tg for the HDPE pure is decreased when bombarded with electron beam. The reduction of Tg could be attributed to chain branching due to a crosslinking reaction between HDPE backbones. Researcher also reviewed that the endothermic peaks at Tg could be attributed to the enthalpy relaxation effects coming from the thermal history of the samples (6). The Xc showed in table were increasing when the HDPE is been irradiate with electron beam. From the result, this is indicated that by exposed the blend to the electron beam, the Tm of HDPE increase but decreasing their Tg. 3.1.3. Tensile Test. Tensile strength with different dose was summarized in Figure 9 below. Tensile strength of the HDPE increased with increasing of irradiation dose. Tensile strength of pure HDPE was 30.1 MPa. When undergo the irradiation dose from 50 up to 200kGy, the tensile strength increasing to 30.3, 31.3, 32.2 and 32.1 MPa respectively. This occurred due to the cross linking of the HDPE. The highest tensile strength recorded is 32.2 MPa with irradiation dose of 150 kGy. Figure 9. Tensile strength. 3.1.4.Impact. The impact strength with the different dose of irradiation is shown in Figure 10. It can be seen that with increasing of irradiation dose, the impact toughness increase for prepared sample. 9PDF Image | marine grade radiation cross-linked high density polyethylene (HDPE) floater pontoon
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