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

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, α-methylstyrene and vinyltoluene, was studied as a function of temperature and weight fraction of the two components....

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Bibliographic Details
Published in:Polymer (Guilford) 1993, Vol.34 (10), p.2202-2207
Main Authors: Marcandalli, Bruno, Testa, Giovanni, Seves, Alberto, Martuscelli, Ezio
Format: Article
Language:English
Subjects:
alicyclic oligomer
Applied sciences
blend
Exact sciences and technology
Miscellaneous
Organic polymers
oxygen permeation
Physicochemistry of polymers
polypropylene
Properties and characterization
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Summary: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, α-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 α 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, P a. This experimental behaviour may be explained by the formation of microvoids; the increase in microporosity modifies the mechanism of the permeation process.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(93)90751-U