Abstract
A series of maleated cottonseed oil polyol (MAHCSO) based, DMPA (dimethylol propionic acid) free, catalyst free waterborne polyurethane dispersions (PUDs) were synthesized. Four different tertiary amines, were employed as neutralizing agents to investigate the role of countercation on the physico-chemical properties of PUDs and their corresponding cured films. The developed PUDs were characterized by particle size analysis, zeta potential distribution, viscosity and storage stability and the cured film samples were characterized by FT-IR (ATR), DMTA (Dynamic mechanical and thermal analysis), UTM (Universal testing machine) and contact angle analyses. It was found that the waterborne PUD with countercation having more number of hydroxy alkyl chains exhibit a larger particle size, a less negative zeta potential, higher viscosity and lower storage stability, where as the corresponding cured film possesses lower thermal stability, mechanical strength and poor surface properties.
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