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Oxygen permeation through films of pure poly(propylene) (iPP) and iPP blended with a fully saturated alicyclic hydrocarbon resin (IST), obtained by oligomerization of indonaphthene, ct-methylstyrene and vinyltoluene, was studied as a function of temperature and weight fraction of the two components. Increasing IST content lowers oxygen permeability and increases the glass transition temperature of the polymer blends. Annealing for 2 min at 375 K was shown to transform completely the smectic phase in the ~t crystalline form, while annealing for 10 min at 393 or 403 K induces a marked increase in crystallinity and in effective oxygen permeability per unit of amorphous component, Pa. This experimental behaviour may be explained by the formation of microvoids; the increase in microporosity modifies the mechanism of the permeation process.

Посилання на статтю:

Characterization of films of polypropylene blended with an alicyclic oligomer through oxygen permeation measurements / Bruno Marcandalli and Giovanni Testa and Alberto Seves // Polymer. – 1993. – Vol 34. – P. 2202-2207.

Characterization of films of polypropylene blended with an alicyclic oligomer through oxygen permeation measurements - Завантажити.