Water base polyurethane dispersions (PUDs) which are widely used as coatings and adhesives are now being derived from renew-able resources due to their eco-friendliness, good biocompatibility and biodegradability.1-3 Polyimide (PI) is an important class of heterocyclic polymers with remarkable heat-resistance properties and superior mechanical and electrical characteristics and durability.4,5 Imide units are incorporated into thermoplastic and solvent-based polyurethane (PU) chains to improve the thermal stability of PU. However, these poly(urethane-imide) (PUI) materials have poor processability and suffer from solvent emission. To prepare easily processable and environmentally friendly PUI products, some waterborne PUIs are synthesized using a prepolymer process.
کلید واژگان :poly (urethane-imide)
ارزش ریالی : 500000 ریال
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