Soy-based adhesives, developed initially in 1923, are inexpensive,
abundant, and environmental-friendly. This abundant protein resource
can be obtained as a by-product from the processing of soybean oil
industry. Industrial utilization of soy proteins for the production of
biodegradable resins has led to increased interest in these materials
for further potential applications as well as enhancing the values of
such systems
. Soy proteins as wood adhesives have many
unique properties such as renewability, abundance, operability, low
press temperature, and high wood-binding ability with relatively high
moisture content
. However, soy-based adhesives cannot be used
extensively, and their development is limited because of poor water
resistance and bonding strength.
Substantial research has been conducted in the last few dec-
ades to improve the adhesion properties of soy proteins for
manufacture of wood products. Soy proteins can be
used in the industry because of the functional properties. The
modifiation of soy proteins aims to improve the functional
properties by altering their molecular structure or conformation