Polyurethane (PU) production with the use of vegetable oils is greatly appreciated by researchers due to their low cost, easy availability, and nontoxic nature. The addition of TiO 2 in castor oil-based PU adhesive led to a remarkable enhancement in its mechanical and chemical resistance, an increase in T g value, and the adhesion. TGA analysis was done to study the thermal stability of prepared adhesive. The adhesive was also characterized by differential scanning calorimetry (DSC) and FT-IR spectroscopy. Influence of various factors such as the NCO/OH molar ratio, hydroxyl value of polyols, and the amount of filler on the properties of adhesive were studied in detail. The adhesive with a mole ratio of NCO/OH equaling to 1.2, filled with 3 wt% TiO 2 , was found to be much better than the commercial adhesive used for bonding wood, when tested for single lap shear strength in various environmental conditions. C

This study has been conducted with an emphasis to develop a biobased polyol from canola oil by transesterification reaction followed by epoxidation and ring opening reaction with an intention to insert hydroxyl group at unsaturation sites. The products obtained were characterized by nuclear magnetic resonance and FTIR spectroscopy for structural analysis and to determine the extent of reaction. Furthur, the studies have been conducted on different Polyurethane (PU) adhesives obtained by reacting this resulted canola oil based polyether-ester polyol and various kinds of aliphatic or aromatic diisocyanates commercially available, i.e., Methylenediphenyldiisocyanate (MDI), Toulenediisocyanate (TDI), Isophoronediisocyanate (IPDI), Hexamethylenediisocyanate (HMDI) with a purpose to examine their influence on adhesive properties such as green strength, curing time, gel time, lap shear strength. The properties of resulted polyurethanes had shown considerable (or prominent) variation in their behavior particularly in terms of thermal stability, adhesion strength, corrosion resistance, etc. The synthesized adhesive showed much better performance as compared to commercially available adhesive formulation under different conditions of testing. The thermal stability of PU adhesive formulation were analyzed and compared by thermogravimetric analysis.

For the green synthesis of polyurethane (PU), non‐isocyanate routes are worthy alternatives. In the present work, we have explored 5,10,15‐tris(pentafluorophenyl)corrolato‐manganese(III) complex as novel catalyst for coupling reaction between epoxidized canola oil and CO2 (gaseous) to introduce cyclic carbonate moieties in the oil and further used it to obtain non‐isocyanate PU, generally abbreviated as NIPU, by curing with different diamines. The results obtained indicated a 1/4th of the reduction in reaction time with the use of 5,10,15‐tris(pentafluorophenyl)corrolato‐manganese(III) complex as catalyst as compared to the previously reported literature data. As per the reported studies, the corrole metal complex has not been used for this reaction earlier. The structure of products and intermediates were confirmed by using different characterization techniques like 1H NMR and FTIR spectroscopies. The thermal and mechanical behavior of final product was analyzed by TGA and universal testing machine, respectively. The non‐isocyanate PU obtained showed a good thermal stability up to 200°C and a tensile strength of up to 8 MPa. The effect of structure of diamines on the properties of non‐isocyanate PU was also extensively studied.