Abstract
Air dried, chemically stable, powdery, polyacrolein was immersed into liquid SO2 at room temperature in order to obtain the chemically active polyacrolein-CH(OH)SO3H. After immersion for 24hrs, light brown powdery polyacrolein-CH(OH)SO3H was gained. This powder is easily soluble in water. The polyacrolein-CH(OH)SO3H was reacted with alcohols to form polyacrolein acetals, which was soluble at room temperature in several organic solvents, such as dimethyl formamide, dimethyl sulfoxide, dioxane and acetone. CH(OH)SO3H groups in polyacrolein reacted with hydroxyl groups in polyvinylalcohol and starch in the aqueous SO2 solution. Polyvinylalcohol film crosslinked with polyacrolein-CH(OH)SO3H swelled to some extent but did not dissolve in water. Furthermore, the crosslinked polyvinylalcohol film displayed high elastic recovery. 84% recovery was obtained from 35% stretch in water, and this value was retained after 10 times stress-strain repeating tests. The dynamic modulus and tan δ had a low dependency on temperature.
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