http://repository.ipb.ac.id/handle/123456789/26684 2026-04-11T19:43:24Z http://repository.ipb.ac.id/handle/123456789/76510 Synthesis Of Zinc-Difattyalkyldithiocarbamates And Their Antioxidant Activities Sutriah, Komar; Mas’ud, Zainal Alim; Irawadi, Tun Tedja Zinc-difattyalkyldithiocarbamates are organosulfur compounds with many functions, including as an antioxidant in a lubrication system. They were synthesized by reacting secondary fatty amine with ZnCl2 and CS2 giving result zinc-difattyalkyldithiocarbamates of around 77-87%. The synthesized products were characterized using infrared (IR) spectroscopic techniques. The IR spectra of zinc-difattyalkyldithiocarbamates showed sharp bands at 1450-1550 cm−1 for thioureida ʋ (C-N), 950-1050 cm−1 for ʋ (C-S), and in the far-red area 300-400 cm−1 for sulfurmetal bond. Products recovery was evaluated by AAS and the purity was analyzed by HPLC. Seven variants of zincdifattyalkyldithiocarbamates were obtained. Antioxidant activity was evaluated by rancimat test regarding their induction time. At 125 ppm levels all variants showed higher value in each of their induction time as compared to those of butylated hydroxyanisole and butylated hydroxytoluene, commercial antioxidants No.1, and commercial antioxidants no.2. Three variants, i.e. Zn-bis(dilauryl)dithiocarbamate, Zn-bis(laurylpalmityl)dithiocarbamate, and Zn-bis(laurylstearyl)dithiocarbamate had higher values in their induction time than the other variants. The values are 16.67, 26.54, and 16.11 h, respectively. 2012-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/76318 Production of Cellulose Acetate from Oil Palm Empty Fruit Bunches Cellulose Bahmid, Nur Alim; Syamsu, Khaswar; Maddu, Akhiruddin Cellulose acetate was produced from acetylation process oil palm empty fiuit bunches cellulose which underutilized. To obtained cellulose acetate qualified was needed cellulose with high purity level which was produced through several stages are pre-hydrolysis, delignification, pulping and bleaching. The purpose of this research was to making cellulose acetate and detennining the exact acetylation time from oil palm empty fruit bunches cellulose. The research was conducted several stages are cellulose extraction, cellulose acetate production with acetylation process and characterization of acetate cellulose. The production process of cellulose acetate was done with acetylation time arc 15, 30, 45 and 60 minutes. The results were obtained cellulose acetate by water content range from 4.332 to 4,468%, the highest yield for 45 minutes was 189 .699% and the best acetyl content for 30 minutes was 40.108%. FfIR analysis was showing carbonyl group at 1759 cm·• and C-0 group at 1234 cm·• region. Morphology of cellulose acetate obtained was shaped cylindrical fibers and had perforated layer. 2013-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/76301 Utilization of Glycerol Derived from Jatropha’s Biodiesel Production as a Cement Grinding Aid O. Farobie; S S. Achmadi; L K. Darusman Biodiesel production results in glycerol production as the main by-product in biodiesel industry.One of the utilizations of glycerol obtained from biodiesel production is as a cement grinding aid (CGA). Results showed that crude glycerol content was 40.19% whereas pure glycerol content was 82.15%. BSS value of the cement with CGA supplementation was higher than that of nonsupplemented cement (blank) indicating that CGA-supplemented cement had higher fineness than the non-supplemented one. It was also found that pure glycerol 95% and TEA 5% at 80ºC was the optimum CGA used to result in finest cement with BSS value of 4.836 cm2/g. Residue test showed that the smallest percent residue value (0.11%) was obtained in cement with supplementation of pure glycerol 95% and TEA 5%. Results of residue test confirmed those of BSS test showing that cement with supplementation of pure glycerol 95% and TEA 5% had the finest particle size. 2012-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/76296 Rekayasa Biopolimer Jerami Padi dengan Teknik Kopolimerisasi Cangkok dan Taut Silang Purwaningsih, Henny; Irawadi, Tun Tedja; Mas’ud, Zainal Alim; Fauzi, Anas Miftah Kopolimerisasi cangkok dan taut silang akrilamida (AAm) terhadap jerami padi dilakukan dalam suasana hampa udara menggunakan aliran gas N2 dengan amonium persulfat (APS) sebagai inisiator dan N,N’-metilena-bis-akrilamida (MBAAm). Pencirian dilakukan dengan teknik mikroskopi pemayaran elektron (SEM) untuk melihat morfologi permukaan, teknik spektroskopi FTIR untuk melihat gugus fungsi, dan teknik DTA untuk menganalisis ketahanan produk terhadap suhu. Kajian dilakukan terhadap swelling capacity produk hasil rekayasa. Spektra FTIR dan mikrograf menunjukkan bahwa kopolimerisasi cangkok dan taut silang telah terjadi pada biopolimer selulosa jerami padi. Produk hasil rekayasa memiliki ketahanan termal yang lebih baik dan indeks kristalinitas yang lebih tinggi dari isolat selulosanya. Nisbah dan efisiensi pencangkokan berturut-turut adalah 66,14-78.15% dan 13,23-16.63%. Swelling capacity sebelum proses hidrolisis berkisar antara 8,16- 12,20 g g-1 . Proses hidrolisis terhadap produk hasil rekayasa mampu meningkatkan swelling capacity hingga 12,5 kali kapasitas awal. 2012-01-01T00:00:00Z