Abstract
Poly (vinyl alcohol)(PVA) was dissolved in water and formalized in different concentrations of formaldehyde and hydrochloric acid. The formalized PVA were acetylated.The molecular weights of the acetylated specimens were measueed by osmometry. Theobserved molecular weight was compared with the calculated value as linear polymer andit was found that the content of the crosslink in formalized PVA increased with increasingconcentration of formaldehyde and hydrochloric acid.
It is known that the content of trioxymethylene glycol in aqueous solution of formaldehydeincreaseswith increasing concentration of formaldehyde and carbonium ion producedfrom the glycol increases with increasing concentration of an acid. We think thereforethat the content of the crosslink by trioxymethylene glycol is higher than that by formaldehyde.
