This study aimed to determine the tensile strength and strain properties of poly(methyl methacrylate) (PMMA)/nano-zircon (n-ZrSiO4) composites with various nano-zircon sizes. Wet milling method for 5 and 15 h without annealing treatment was used to obtain the nano-zircon powders. Results showed that milling for 15 hours can reduce zircon size up to 93 nm. Meanwhile, the composites were synthesized with zircon compositions of 1, 2.5, and 5 wt.%. Dynamic Mechanical Analyzer (DMA) measurement were carried out to characterize the tensile-strain dependence on filler compositions of the PMMA/n-ZrSiO4 composites. The PMMA/n-ZrSiO4 composite with 5 wt.% and 15h milling zircon exhibited the highest tensile strength, ca. 10.02 MPa or 2 times of the pure PMMA. The tensile strength of the composites can be explained from the mean size and size distribution of the filler.
In the study, poly(methyl methacrylate) (PMMA)/zircon (ZrSiO4) composites were successfully prepared using the liquid method at different compositions of 1, 2.5, and 5 wt% of zircon. The zircon filler was processed from a natural, local zircon sand and was processed via a top-down method using wet ball-milling for 5 and 15 h as well as annealing at temperature of 200 °C for 1 h. The force-displacement curves of the composites have been acquired using a DMA (dynamic mechanical analyzer) technique in tensile mode. XRD (x-ray diffraction) data of the composites were collected and analyzed in order to examine the present phases and used as the evidence of the formation of the composites. Furthermore, MAUD software was used to estimate the crystallite size of the filler. Results indicated that zircon crystallite size for 15 h wet ball-milling was smaller than that of 5 h. Furthermore, the maximum DMA force (also representing stress) for the composite with smaller filler was generally higher than that of 5 h, ca. by 2.5 times. In addition, in general, the composites exhibited an increasing slope of force-displacement curve with increasing amount of filler.
Penelitian ini bertujuan untuk mengetahui upaya pelestarian aksara KaGaNga sebagai bentuk sarana komunikasi dalam perwujudan identitas suku rejang di Kabupaten Lebong dan untuk mengetahui bentuk sarana komunikasi dalam pelestarian aksara KaGaNga di Kabupaten Lebong. Penelitian ini menggunakan tipe penelitian kualitatif yang bersifat dekriptif. Dalam penelitan ini peneliti menggunakan Teknik pengumpulan data dengan melakukan wawancara, observasi dan dokmuentasi serta menggunakan hasil penemuan data yang peneliti dapatkan di lapangan selama proses penelitian berlangsung, sehingga di dapatkan data yang dibutuhkan. Informan dalam penelitian ini terdiri dari informan kunci dan informan pokok.Hasil penelitian ini menunjukkan Upaya pelestarian aksara KaGaNga sebagai bentuk sarana komunikasi dalam perwujudan identitas suku rejang di Kabupaten Lebong sudah dilakukan dengan baik oleh masyarakat dan pemerintah Kabupaten Lebong.
Kata Kunci : Pelestarian, Aksara Ka Ga Nga, Sarana Komunikasi
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