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Glassy polymers orientation-induced effects

Orientation-Induced Effects. Orientation and combined heat and orientation processing affect the transport properties of glassy polymers. Especially when crystallites are present, the effects can become surprisingly large. As noted... [Pg.1336]

Orientation of the polymer may also influence the permeation properties. However, the overall effect is highly dependent upon crystallinity. For example, deformation of elastomers-has little effect on permeability until crystallization effects occur. " Orientation of amorphous polymers can result in a reduction in permeability of around 10-15%, whereas in crystalline polymers, e.g, poly(ethylene terephthalate), reductions of over 50% have been observed. At high degrees of orientation, time-dependent effects on permeability occur in both glassy and semi-crystalline polymers. These effects have been related to the relaxation recovery of strain-induced areas of free volume generated during orientation. ... [Pg.662]

See other pages where Glassy polymers orientation-induced effects is mentioned: [Pg.38]    [Pg.48]    [Pg.54]    [Pg.63]    [Pg.262]    [Pg.152]    [Pg.152]    [Pg.176]    [Pg.157]    [Pg.272]    [Pg.305]    [Pg.272]    [Pg.447]    [Pg.157]    [Pg.791]    [Pg.484]   
See also in sourсe #XX -- [ Pg.2 , Pg.1336 , Pg.1337 , Pg.1338 , Pg.1339 ]



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