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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 Figure 12. The crosslink degree of HDPE/EVA. Crosslink with 50kgy irradiation dose have a 42% of crosslink degree and increase slightly when the sample bombarded with 100kGy. With the presence of 100kGy of electron beam irradiation, the crosslinking degree is about 57%. For dose 150kGy, the result also showed the increment in crosslinking degree from 57% to 62% and it increase slightly with the 200kGy as shows in the Figure 11. Increasing the dose would enhance the chances of crosslinking process occurs in the backbone of HDPE/EVA, hence the crosslink degree increased. 3.2.2. DSC. The thermal properties of samples were determined by DSC analysis. Figure 3 and 4 shows the DSC curve of heat flux versus temperature at different dose. The value of melting temperature, Tm, glass transition temperature, Tg and degree of crystallinity, %Xc of each samples were summarized in Table 2. Table 2. Tm, Tg and Xc value for different dose of HDPE/EVA. Sample Description HDPE/EVA HDPE/EVA50 HDPE/EVA100 HDPE/EVA150 HDPE/EVA200 Tm (oC) 131.38 132.78 132.40 131.86 131.08 Tg (oC) 67.34 65.69 67.22 66.30 66.16 Xc (%) 54.33 55.87 54.32 55.97 55.23 The Tm value of the HDPE/EVA is increase in increasing of the irradiation dose but decreasing when being bombarded with 150 and 200kGy. For the Tg, the Tg for the HDPE/EVA is decreased when bombarded with electron beam. The reduction of Tg could be attributed to chain branching due to a crosslinking reaction between HDPE and EVA. The Xc showed in table were increasing when the HDPE/EVA is being irradiate with electron beam. It seems that, by exposed to electron beam, had increase it Tm and but decreasing their Tg. 11PDF Image | HDPE floater pontoon material
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