Mechanical and Thermal Properties of Castor Oil–Based Polyurethane Adhesive: Effect of TiO₂ Filler

Abstract

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

Influence of aliphatic and aromatic isocyanates on the properties of poly(ether ester) polyol based PU adhesive system

“…Different adhesive formulations of PU were prepared by following the method already described by the author in some other studies . Briefly, the above prepared polyol of hydroxyl value approximately 400, were mixed with 0.05% TBTDL for 30 minutes on a magnetic stirrer under nitrogen atmosphere.…”

Addition of anti-flaming agents in castor oil based rigid polyurethane foams: studies on mechanical and flammable behaviour

“…The RPUFs developed in the given study have been derived from a plant source i.e. castor oil, the properties of which are studied and reported earlier by the some researchers [20][21][22][23][24][25][26][27] and other investigators and found to be comparable with commercial petrochemical based RPUFs.…”

“…A two-step process was used to prepare the anti-flammable RPUFs. Castor oil was modified by transesterification process in the first step to get polyol (Mpol) according to the procedure reported in prior studies [24][25][26]. Glycerol was used to enhance the hydroxyl value of castor oil by introducing more hydroxyl groups.…”

Investigation on flammability of rigid polyurethane foam‐mineral fillers composite

“…The first peak at around 300°C to 350°C is attributed to the degradation of the urethane and urea linkages in the hard segments and the decomposition of the flexible phase containing polyol. The second peak observed at 450°C to 500°C is related to the thermolysis of the organic residues and the degradation of soft segments …”

“…The second peak observed at 450°C to 500°C is related to the thermolysis of the organic residues and the degradation of soft segments. 34 Conventionally, the thermal stability of RPUFs is described by the temperatures of 5% weight loss (T 5% ) considered as the temperature for the onset of degradation. 35 Results showed that 5% weight loss temperature (T 5% ) increased from 192 ± 2°C to 218 ± 2°C for the foam with 8% feldspar and 260 ± 2°C for the foam with 6% kaolinite clay, then again decreased due to heterogeneity generated by agglomeration of [Colour figure can be viewed at wileyonlinelibrary.com] the filler at higher concentration.…”