The properties of the paper prepared by the grafted pulp were examined.
As it was expected, properties were greatly affected by the manufacturing method. Degree of hydrolysis of the grafted pulp had the greatest effect on such properties as tensile strength, surface smoothness, moisture regain or heat bonding of the paper. Generally, grafted pulp manufactured by the wet method showed better properties than that of manufactured by the dry method.
As for the tensile strength, the grafted pulp having a higher value of per cent grafting and degree of hydrolysis had a higher value of tensile strength, and the maximum value we had was 2.5 times higher than the blank value. From the result, it was obvious that graft copolymerization of vinyl acetate on the pulp was effective to reinforce the tensile strength of the paper.
As for the tearing strength, graft copolymerization had no reinforcing effect. Compared with the paper prepared by the original pulp, surface smoothness, burst factor and folding endurance as well as tensile strength greatly improved for the paper prepared by the PVA grafted pulp. Consequently, we consider that the graft copolymerization of vinyl acetate on the pulp is quite useful for the improvement of the paper material.