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Studies on lignin‐based adhesives for plywood panels
Author(s) -
Mittal Mradula,
Sharma Chandra B.
Publication year - 1992
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990290103
Subject(s) - adhesive , lignin , formaldehyde , phenol , materials science , glue , sawdust , shear strength (soil) , composite material , phenol formaldehyde resin , water resistance , wet strength , bond strength , bonding strength , pulp and paper industry , chemistry , organic chemistry , ultimate tensile strength , environmental science , layer (electronics) , soil science , engineering , soil water
Lignin, a naturally occurring polymer, was isolated from sawdust and used as a substitute in phenol formaldehyde resins. Thus lignin‐phenol formaldehyde adhesives for plywood with lignin‐phenol ratios of 50:50, 60:40, 70:30, 80:20 and 90:10 were prepared. Glue shear strength for these adhesives was tested by preparing three‐ply plywood panels. The adhesives showed a dry bond strength varying from 0.57 to 0.82 MPa. The glue shear strength for cold water resistance tests varied from 0.16 to 0.25 MPa, indicating that even 80% replacement of phenol with lignin is capable of producing a bond quality acceptable for cold water resistant grade plywood.