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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 HDPE/EVA blend in internal mixer at 50 rpm and 190oC Adding TMPTA then Cooling to room temperature Undergo hotpress machine at 170oC for 15 minutes Irradiation 50, 100, 150 and 200 kGy respectively Characterizations Figure 2. Process flow of preparation of HDPE/EVA blends with crosslinker agent. 2.4 Gel Content The crosslink degree of HDPE and HDPE/EVA was determined by a gel content method. The products obtained from electron beam were cut into 0.2 cm2 with three time repetitions before being put into a wire mesh. Then, the samples prepared were being boiled in 40 mL xylene, at 60°C. The solution was being left for about 24 hours. Then, the sample were collected and washed by ethanol to get rid the excessive ethanol after being boiled. The samples then were being dried at 70oC in a vacuum oven for 4 hours. To measure the crosslink degree, the dried sample then collected and measured it final weight in order to obtain the mass of sample that do not dissolve, that indicate the crosslink part of the samples. The crosslink degree was calculated using the following equation. Each sample were tested in triplicate and average values were reported. Gel Content = (Wt. of sample after boiling)/ (Wt. of sample) x 100% (1) 4PDF Image | marine grade radiation cross-linked high density polyethylene (HDPE) floater pontoon
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