Perbedaan Kekuatan Impak Resin Akrilik Polimerisasi Panas setelah Ditambahkan Serat Batang Pisang Barangan (Musa Acuminata Linn.) dengan Alkalisasi NaOH 5%

Abstract

One of the way to increase the impact strength of heat-cured polymerized acrylic resin so that it does not fracture easily when exposed to a sudden impact is by adding barangan banana stem fiber (Musa Acuminata Linn.). The design used in this research was post-test only control group design. The sample in this study was hot polymerized acrylic resin in the form of plates measuring 80 mm x 10 mm x 4 mm with a sample size of 10 plates for each group, namely group I (without the addition of fiber), group II (addition of alkalized barangan banana stem fiber and colored with red dragon fruit extract), and group III (addition of alkalized barangan banana stem fiber without being colored with red dragon fruit extract). Banana stem fiber is alkalized and then colored with red dragon fruit extract. Alkalization of banana stem fibers was carried out by soaking them in 5% NaOH solution at a temperature of 25oC with a soaking time of 1 hour. Acrylic resin dough with a ratio of 2.3 grams of powder : 1 ml of liquid is stirred and put into 1/3 of the plate and 8 fibers with continuous fiber orientation are arranged after which the rest of the dough stage is added and then pressed using a hydraulic press. The curing process is carried out in a water bath from room temperature and raised to 74ºC for 2 hours, then raised to 100ºC for 1 hour then polished. Impact strength measurement using the Charpy Impact Tester and data test using one-way anova. The mean results and standard deviation of the impact strength values for the group without adding fiber, the group adding dyed alkalized fiber, and the group adding alkalized fiber without dyeing were 00,0085 ± 0,0015 J/mm2, 0,0096 ± 0,0016 J/mm2, and 0,0090 ± 0,0017 J/mm2. The one-way anova test shows that there is no significant difference with a value of p = 0.310 (p>0.05). From the results of this study it can be concluded that there is no significant difference in the impact strength of hot polymerized acrylic resin between group I, group II, and group III. However, there was an increase in the impact strength of hot polymerized acrylic resin with the addition of alkalized barangan banana stem fibers in a continuous direction with and without dyeing red dragon fruit extract.