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Synthesis of palm oil‐based polyester polyol for polyurethane adhesive production
Author(s) -
Ang Khoon Poh,
Lee Choy Sin,
Cheng Sit Foon,
Chuah Cheng Hock
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39967
Subject(s) - polyol , polyurethane , polyester , adhesive , materials science , polymer chemistry , isocyanate , hydroxyl value , solvent , acid value , viscosity index , organic chemistry , chemistry , composite material , scanning electron microscope , biochemistry , base oil , layer (electronics)
Palm oil‐based polyester polyol is synthesized by ring opening reaction on epoxidized palm olein by phthalic acid. The reaction is carried out in a solvent free and noncatalyzed condition with the optimal reaction condition at 175°C for 5 h reaction time. The physical state of the product is a clear bright yellowish liquid with low viscosity value of 5700–6700 cP at 25°C and pour point of 15°C. The chemical structure and molecular weight of the polyester polyol were characterized by FTIR, 1 H‐NMR, 13 C‐NMR, and GPC. The optimal polyol with molecular weight of 36,308 dalton and hydroxyl value of 78.17 mg KOH/g sample was reacted with polymeric 4,4′‐methylene diphenyl diisocyanate (pMDI) at isocyanate index of 1.3 to produce polyurethane adhesive. The lap shear strength of the polyurethane adhesive showed two times higher than the commercial wood adhesives. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131 , 39967.