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Development of biobased polyurethane‐imides from maleinized cottonseed oil and castor oil
Author(s) -
Boga Karteek,
Gaddam Sashivinay Kumar,
Chepuri Ramakishan Rao,
Palanisamy Aruna
Publication year - 2019
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4705
Subject(s) - polyurethane , castor oil , prepolymer , materials science , maleic anhydride , imide , glass transition , thermal stability , polymer chemistry , ultimate tensile strength , organic chemistry , composite material , chemistry , polymer , copolymer
An eco‐friendly coating system, which is largely biobased, has been developed from castor and cottonseed oil. Cottonseed oil was functionalized with maleic anhydride by “ene” reaction to give maleinized cottonseed oil (MACSO); the anhydride groups were reacted with isocyanates to yield –NCO terminated polyurethane prepolymer. The prepolymer was further chain extended with hydroxyl groups of castor oil to give polyurethane‐imides (PUIs). The cross‐linked films thus obtained had good mechanical properties, and the imide groups in the backbone improved the corrosion resistance of PUIs as revealed by potentiodynamic polarization study. With increasing content of MACSO, thermal stability, glass transition temperatures ( T g ), tensile strength, and corrosion resistance of resulting PUIs significantly increased.