Publications by authors named "Rita Kartika Sari"
Article Synopsis
- The study explores the use of alternative raw materials, specifically areca-based particleboard, by testing different hardeners and tannin-glyoxal (TG) adhesive formulations to improve adhesion and cohesion properties.
- Researchers used NHCl and NaOH as hardeners, along with three adhesive formulations at different tannin:glyoxal ratios, and employed various analytical techniques to examine the properties of the adhesive.
- Results indicated that the highest glyoxal percentage improved polymer bonds, with NHCl hardener yielding superior mechanical properties, and the F1 adhesive formulation demonstrating the best overall adhesion performance, meeting the standards for Type 8 particleboard.
Article Synopsis
- - The demand for cotton in the textile industry is outpacing its supply, leading researchers to explore alternatives like ramie fiber, which is renewable but needs enhanced fire-resistance.
- - This study examines lignin from black liquor and its use in creating lignin-based non-isocyanate polyurethane (L-NIPU) to impregnate ramie fibers, improving their mechanical properties and weight gain.
- - Results indicate that longer impregnation times with L-NIPU enhance ramie fiber's properties, but alternative synthesis methods produce less heat resistance than traditional methods, showcasing L-NIPU's potential for broader industrial use.
Article Synopsis
- This study focused on creating two types of tannin-based resins (tannin-Bio-NIPU and tannin-Bio-PU) to enhance the properties of ramie fibers through an impregnation process.
- The resins were developed using a reaction involving tannin extract and different chemical components, and the effectiveness of the resins was tested on both treated and untreated ramie fibers.
- Results showed that the tannin-Bio-PU resin provided better mechanical and thermal properties, particularly with untreated ramie fibers, resulting in increased thermal stability and tensile strength.
The development of drug resistance is one of the most severe concerns of malaria control because it increases the risk of malaria morbidity and death. A new candidate drug with antiplasmodial activity is urgently needed. This study evaluated the efficacy of different dosages of aqueous extract of Strychnos ligustrina combined with dihydroartemisinin and piperaquine phosphate (DHP) against murine Plasmodium berghei infection.
View Article and Find Full Text PDFThe purpose of this study was to prepare low-viscosity lignin-based polyurethane (LPU) resins for the modification of ramie ( (L.) Gaudich) fiber via impregnation to improve the fiber's thermal and mechanical properties. Low-viscosity LPU resins were prepared by dissolving lignin in 20% NaOH and then adding polymeric 4,4-methane diphenyl diisocyanate (pMDI, 31% NCO) with a mole ratio of 0.
View Article and Find Full Text PDFIn this study, lignin isolated and fractionated from black liquor was used as a pre-polymer to prepare bio-polyurethane (Bio-PU) resin, and the resin was impregnated into ramie fiber ( (L.) Gaudich) to improve its thermal and mechanical properties. The isolated lignin was fractionated by one-step fractionation using two different solvents, i.
View Article and Find Full Text PDFReducing hazardous heavy metal ions using mangium bark waste.
Environ Sci Pollut Res Int
August 2016
The objective of this study was to evaluate the characteristics of mangium bark and its biosorbent ability to reduce heavy metal ions in standard solutions and wastewater and to assess changes in bark characteristics after heavy metal absorption. The experiments were conducted to determine heavy metal absorption from solutions of heavy metals alone and in mixtures as well as from wastewater. The results show that mangium bark can absorb heavy metals.
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