Srikanta Dinda

Development of Synthetic Ketonic Resin

In the present work, the self-polymerization reaction of cyclohexanone was studied to develop a synthetic resin. Synthetic resins are extensively used in paint industry to improve the adhesiveness of paints. Polymerization reactions were carried out in a high-pressure reactor. The results suggest that the self-polymerization of cyclohexanone mainly depends on alkali concentration, reaction temperature, and reaction time. As the ketone-to-alkali ratio decreases, the degree of polymerization increases, which leads to an increase in the hydroxyl value and softening point and a remarkable decrease in solubility. A good-quality solid resin could be obtained with a ketone-to-alkali ratio less than 5 in the temperature range between 130°C and 160°C and within the time duration of 12–22 h. These data may be useful to develop the desired quality of resin in the field of paint application.

Development of Bio-Based Epoxide from Plant Oil

Epoxidation of nahor oil was performed by peroxycarboxylic acid generated in-situ, in the presence of acid catalyst. The reaction was carried out at 50 °C under a stirring speed of 1600 rev/min. The performance of different carboxylic acids namely formic, acetic, and propanoic acid, and the effect of different catalysts namely H2SO4, Amberlite IR 120H, and Dowex 50 WX8 on epoxide yield was examined in the present study. It was possible to obtain around 70 % epoxide yield within 8 h at a moderate temperature of 50 °C. Among the catalysts studied, Amberlite IR 120H showed better epoxide yield compared to H2SO4 and Dowex 50 WX8. The performance of carboxylic acids was found to be in the order of formic acid > acetic acid > propanoic acid. The FTIR analysis confirmed the formation of glycol products. The findings of the present study will provide useful information for making bio-based plasticizers and lubricants.

Surface morphology and active sites of TiO2 for photoassisted catalysis

The main aim of this work is to discriminate the closely related adsorption and catalytic degradation processes that occur during a photocatalytic reaction. Very high-surface-area TiO2 and Pd-doped TiO2 were synthesized by microwave-assisted hydrothermal synthesis and used for degradation of methylene blue as a model pollutant dye. Thorough structural, morphological, and surface analyses of the synthesized catalysts were conducted to investigate key material properties that influence adsorption and catalytic performance. The adsorption capacity of the catalysts was determined by fitting adsorption data using the Langmuir isotherm model, and the photocatalytic activity of the synthesized samples was evaluated by periodically measuring the concentration of methylene blue as it was photocatalytically degraded under ultraviolet (UV) light. The results indicated that noble-metal incorporation compromised adsorption but favored catalytic performance.

Hydroxyl-functionalized resin: preparation, characterization, parameter optimization and property prediction

Purpose The objective of the present study is to develop a hydroxyl-functionalized ketonic resin for coating applications, and to establish a standard characterization protocol. The second objective is to quantify the effects of various operating parameters on resin properties, and to develop mathematical models to predict the product properties. The third objective is to carry out the compatibility study between the in-house developed resins and commercially available resins. Design/methodology/approach Self-polymerization reactions were conducted in a batch reactor. Effects of reaction time, temperature, catalyst concentration and reactor pressure on product properties have been studied. Hydroxyl value, iodine value, solubility, rheology, GPC, TGA, SEM, and XRD analysis was carried out to characterize the product properties. Mark–Houwink correlation was used to predict molecular weight of the resins. Findings The study shows that hydroxyl value and softening temperature of the product increased with the...

Production of bio-epoxide and bio-adhesive from non-edible oil

Epoxidation of Nahor oil was performed by H2O2 in the presence of acid catalyst at 50 °C. It was possible to obtain around 70% epoxide yield within 8 hrs of reaction. Amberlite IR 120H showed better epoxide yield compared to H2SO4 and Dowex 50 WX8. The performance of carboxylic acids was found to be in the order of formic acid>acetic acid>propanoic acid. The curing of epoxidized nahor oil involved using ethylenediamine (EDA) and diethylenetriamine (DETA). The adhesive property of the cured resins was tested and compared with commercially available glue. The force required to detach the cardboard joint was about 36.3 N for DETA-cured resin.