Graft copolymerization of acrylamide onto starch initiated by redox system of Ce+4 —> Ce+3.
Part III. The use of starch-grafted polyacrylamide copolymers for making chipboards
with a reduced free formaldehyde content
Polimery 1994, No 11-12, 726
Aqueous solutions of the starch-grafted polyacrylamide copolymer havebeen used to reduce the content of free formaldehyde in chipboards. Severalbinder compositions containing a urea- ormaldehyde resin, an activator, hardener,and an aqueous solution of the grafted copolymer, were applied to severalchipboard lots produced under close-to-commercial conditions. Free formaldehydeand some physical and mechanical property data (density, 2-h and 24-h swelling,water imbibition, static bending strength, and tensile strength) weredetermined for chipboards pressed with and without the grafted copolymer added.The copolymer resulted in the emission of free formaldehyde reduced by 40%.
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