Poly (vinyl alcohol) (PVA) is recognized as one of the very few vinylpolymers soluble in water also susceptible of ultimate biodegradation by microorganisms.
聚乙烯醇(PVA)是较少的可溶于水并被生物降解的乙烯聚合物之一。
3
Polymers of vinyl chloride or of other halogenated olefins, in primary forms.