EFFECTS OF WOOD POLYSACCHARIDES ON THE STABILITY OF COLLOIDAL WOOD RESIN

Wood polysaccharides were evaluated wood resin against elctrolyte-indu ced aggregation. For unbleached pulp fibres, a fraction rich in O-acet yl-galactoglucomannans and a fraction rich in galactans were both able to stabilize colloidal resin. However, neither of these polysaccharid e fractions were as effective stabliziers of wood resin as a sample of all substances dissolved from unbleached TMP. For polysaccharides typ ically present in water samples from peroxide-bleached mechanical pulp s, deacetylated galactoglucomannans provided stabilization of the resi n. Polygalacturonic acids, released from the fibres in peroxide bleach ing, provided some stability against aggregation of the wood resin wit h NaCl but in contrast, caused aggregation in conjunction with CaCl2.