PENGARUH DEBIT ALIRAN RESIN BISPHENOL A LP-1Q-EX PADA METODE VACUUM INFUSION RESIN TERHADAP KEKUATAN TARIK KOMPOSIT SERAT KULIT POHON WARU (HIBISCUS TILIACEUS)

Research on natural fiber composites is being carried out in various parts of the world to produce solutions to environmental problems by utilizing natural fiber materials prepared for environmentally friendly and renewable materials. The natural fiber currently being developed for composite reinforcement is hibiscus bark fiber. This study aims to determine the effect of the flow rate of bisphenol A resin LP-1Q-EX on the vacuum infusion resin method on the tensile strength of hibiscus bark fiber composites. The method used in this study is the fiber structure model in the direction of tensile load, composite using hibiscus bark fiber (Hibiscus tiliaceus), composite using bisphenol A resin LP-1Q-EX, composite using mass fraction with a ratio of 60 fibers: 40 resin, Waru tree bark was treated with 6% NaOH alkaline soaking (aquades 938.8 grams, and NaOH 61.2 grams) for 120 minutes, the number of hibiscus tiliaceus bark fibers in one composite material was 22 fibers with a material thickness of 3.2 mm (according to ASTM D638-03 Type 1 standard), the composite was produced using the vacuum infusion resin method with variations in resin flow rate of 1.19 ml/s, 3.66 ml/s, 4.67 ml/s. The testing process in this study is a composite tensile test using the ASTM D638-03 Type I standard. The analysis of the fractures that occur in each specimen uses macro photos, namely the process of taking several photos of the fracture after the specimen is subjected to a tensile test using a digital camera placed on the ground. topped a tripod. The results of the composite tensile test showed that the variation of resin flow rate of 1.19 ml/s had the lowest tensile strength of 282.94 MPa, while the variation of flow discharge of 3.66 ml/s had the highest tensile strength of 301.75 MPa. and the flow variation of 4.67 ml/s has a tensile strength of 284.54 MPa. Based on the results of the tensile test of the hibiscus tiliaceus bark fiber composite using the vacuum infusion resin method, the highest strength was obtained at a variation of the resin flow rate of 3.66 ml/s.

Novel Application of Hybrid Anion Exchange Resin for Phosphate Desorption Kinetics in Soils: Minimizing Re-Adsorption of Desorbed Ions

The process of phosphate desorption from soils is difficult to measure using stirred batch techniques because of the accumulation of desorbed ions in a bathing solution. To accurately measure the apparent rate coefficient of phosphate desorption from soils, it is necessary to remove the desorbed ions. In this study, a novel hybrid (i.e., iron oxide coated) anion exchange resin was used as a sink to study long-term (seven days) P desorption kinetics in intensively managed agricultural soils in the Midwestern U.S. (total phosphorus (TP): 196–419 mg/kg). The phosphate desorption kinetics in the hybrid anion exchange resin method were compared with those in the other conventional batch desorption method with pure anion exchange resins or without any sink. The extent of P desorption in the hybrid resin methods was >50% of total desorbed phosphate in the other methods. The initial kinetic rate estimated in the pseudo-second-order kinetic model was also highest (3.03–31.35 mg/(g·hr)) in the hybrid resin method when the same soil system was compared. This is because adsorbed P in the hybrid resins was nearly irreversible. The hybrid anion exchange resin might be a new and ideal sink in measuring the P desorption process in soils and sediments.

EFFECT OF Musa acuminate AND Ocimum basilicum MIXED EXTRACTS ON BIOACTIVE RESIN’S FLUORIDE RELEASE

Background: Bioactive composite resin was materials that are able to released fluoride when the intra oral pH value drops. Mouthwash is one of the triggers for changes in pH of the oral cavity. The many side effects caused by chemical mouthwashes make herbal plants an alternative to natural mouthwash. Traditional plants that have the potential to be used as mouthwash include of Mauli Banana (Musa acuminata) and basil (Ocimum basilicum L.).Objective: To analyze the effect of Mauli banana stem (Musa acuminate) and basil leaves (Ocimum basilicum) mixed extracts on fluoride (F) release from bioactive resin. Method: Thirty specimens (15mm diameter x 1mm thick; n=5/group) were fabricated using Activa ™ Bioactive Restorative (Pulpdent). Mauli banana stem and basil leaves extracts mixture at the concentration of 25%, 50%, 75%, and 100% were respectively exerted as treatment groups while 0.2% Chlorhexidine Gluconate (CHX) and aquadest employed as control groups. Bioactive resin immersion was performed for 7 days in 37oC incubator prior to the measurement of F release using pH meter Lutron (208) TL Lutron (Taiwan). Results: One Way Anova and Post Hoc Dunnets-T3 not only depicted the significant differences among treatment groupprior tontly easurement ofrable bioactive resin durability in the oral cavity. on f of 50% (3.22±0.46ppm), 75% (2.31±0,45ppm), 100% (2.29±0.46ppm), but also control group CHX (2.31±0,45ppm), and aquadest (1.85±0.91ppm) compared to 25% treatment group (6.00±0.87ppm).Conclusion: There is a significant effect of Mauli Banana stem and basil leaves extract mixture on bioactive resin F release. Increasing concentration may reduce the number of F release yet achieve a preferable bioactive resin durability in the oral cavity.

Vibrational study and thermal behavior of dihydrogenotriphosphate trihydrate of 4-aminobenzoic acid and its anhydrous new form fertilizer type NP

Chemical synthesis methods and IR spectrometry studies are reported for an organic triphosphate (NH3C6H4COOH)3H2P3O10.3H2O and its anhydrous new form NH3C6H4COOH)3H2P3O10. The hydrate compound (NH3C6H4COOH)3H2P3O10.3H2O was synthetized by the ion-exchange resin method. The dehydration of (NH3C6H4COOH)3H2P3O10.3H2O leads at 130°C to (NH3C6H4COOH)3H2P3O10 crystallizing in the triclinic system with space group P 1 (Z = 2) [a = 14.566(6) Å, b = 6.866 (1) Å, c = 6.445 (6) Å, α = 112.36 (3) °, β = 94.51 (1) °, γ = 95.94(7) °, and V = 587.98 (1) Å3 ]. Merit’s figures are M (10) = 91.9 and F (10) = 55.6 (0.0032, 56). Its thermal behavior and kinetic study were studied by using thermal analyses TGA and DTA techniques between 25 and 600°C.