Effects of TDI and FA‐703 on physico‐mechanical properties of polyurethane dispersion

Abstract

A series of water dispersion polyurethanes dispersions (PUDs) were prepared by polyaddition reaction using isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), poly(oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA), and triol (trade name FA-703). Various formulations were designed to investigate the effects of process variables such as TDI and FA-703 on the physicomechanical properties of PUD. IR spectroscopy was used to check the end of polymerization reaction and characterization of polymer. Evolution of the particle size distribution, contact angle, T g , molecular weight, viscosity, and mechanical properties of the emulsion-cast films were significantly affected by variable content of TDI and FA-703. Average particle size of the prepared polyurethane emulsions and contact angle decrease with increase of content of FA-703 and TDI. Molecular weight, T g , tensile strength, tear strength, hardness, viscosity and elongation at break increase with increase of content of FA-703 and TDI. The increase of molecular weight, tensile strength, tear strength and elongation at break properties are interpreted in terms of increasing hard segments, chain flexibility, and phase separation in high content of FA-703 and TDI-based polyurethane.

Waterborne polyurethane dispersions synthesized from jatropha oil

“…This reveals that the hydrophobicity of the dry films is mainly governed by the high hard segment content, and the increase in ionic content does not significantly increase the hydrophilicity. The results are comparable with PU coatings derived from other vegetable oils such canola oil, sunflower oil, and camelina oil based PU (Kong et al, 2013) and also petroleum based PU dispersions (Negim et al, 2011).…”

Improving biodegradability of polyvinyl alcohol/starch blend films for packaging applications

“…PVA/S blend films were prepared by casting their aqueous solutions onto flat glass surfaces and allowing them to dry at room temperature for 7 days, and then in an aerated oven at 60 o C, for 12 h to completely eliminate water [21][22][23][24][25]. Then, the films were washed thoroughly with distilled water in order to eliminate the residual glacial acetic acid.…”

Effect of acrylic acid on the mechanical properties of PVA/ starch blend films

“…PVA/S/AA blend films were prepared by casting their aqueous solutions onto flat glass surfaces and allowing them to dry at room temperature for 7 days, and then in an aerated oven at 60 o C, for 12 h to completely eliminate water [16][17][18][19][20]. Then, the films were washed thoroughly with distilled water and followed by acetone in order to eliminate the residual glacial acetic acid and AA.…”