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CELLULOSIC FILLER EFFECT ON POLY (VINYL-ACETATE) EMULSION WOOD ADHESIVES By: OGBAN, I. U. & U. A. UNO

ABSTRACT

Cellulosic  filler  material  was  used  to  study  the  effects  on  poly  (Vinyl-acetate)  (PVACemulsion wood adhesives. The elastoplastic behaviour of the filler treated PVAC emulsion was studied using differential scanning calorimetry and dynamic mechanical thermal analysis. The result revealed that the glass transition temperature (Tg) of the filler treated  polymer  is  not  significantly  changed  by  the  addition  of  the  filler  materials whereas  the  tensile  modulus,  the  adhesive  hardness,  and  stiffness  were  significantly changed.  The  viscosity  of  the  emulsion  and  its  performance  on  wood  surfaces  were greatly affected by fillers. The cellulosic fillers have high oil-absorption capacity, hence increased  viscosity  to  greater  extent  than  the  case  with  Kaolin  based  filler  materials with flash coalescence but of mechanically weaker film. The acidity of the fillers influenced the setting time for wood adhesive bonding. On the whole cellulose filler measured was as effective us the commercial (Kaolin) filler. 

 

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