TITLE:
Synthesis of Microcrystalline Cellulose—Polyvinyl Alcohol Stabilized Polyvinyl Acetate Emulsion
AUTHORS:
Ravindra V. Gadhave, S. K. Vineeth
KEYWORDS:
Wood Adhesive, Polyvinyl Acetate, Microcrystalline Cellulose, Bio-Based, Emulsion
JOURNAL NAME:
Green and Sustainable Chemistry,
Vol.13 No.1,
February
7,
2023
ABSTRACT: Polyvinyl alcohol (PVA)
colloid stabilized Polyvinyl acetate (PVAc) based wood adhesive has poor
performance in highly humid conditions.
Currently, the addition of natural fillers
in the wood adhesive is one of the most effective ways to enhance the
performance of PVAc wood adhesive in highly moist conditions.
Microcrystalline cellulose (MCC) are strong renewable, bio-based material and
has great potential in a
reinforcement of the polymeric matrix. Hence, the present work investigates the
applicability of microcrystalline cellulose incorporated 3% and 5% in situ emulsion
polymerization PVAc wood adhesives. Effect on physical, thermal and mechanical
properties was studied by viscosity, pH, contact angle measurement,
differential scanning calorimetry (DSC) and pencil hardness test of films.
Emulsions with different proportions of MCC were prepared and
the shear strength of the applied adhesive on wood was measured. The viscosity
of the adhesives was increased by increasing the concentration of MCC. The
mechanical properties like tensile strength of adhesives with MCC were measured
by universal tensile machine (UTM). Thermal stability was studied by
differential scanning calorimetry (DSC). The tensile shear strength
demonstrates that MCC can improve bonding strength as compared to PVAc Homo based adhesive
in the wet condition which was
validated through a contact angle study. The hardness of PVAc films were also changed positively
by the addition of MCC. Here, we studied the effect of the addition of different concentrations of MCC materials in situ polymerization of PVAc on
their performance properties.