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Determination of isotacticity in polypropylene

โœ Scribed by J. P. Sibilia; R. C. Wincklhofer

Publisher
John Wiley and Sons
Year
1962
Tongue
English
Weight
167 KB
Volume
6
Category
Article
ISSN
0021-8995

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๐Ÿ“œ SIMILAR VOLUMES

Determination of intrinsic birefringence
Determination of intrinsic birefringence of smectic phase in isotactic polypropylene
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When isotactic polypropylene is quenched a t 0ยฐC from the molten state, a biphasic material, amorphous-smectic, is obtained. The smectic phase has an intermediate order between the amorphous and the crystalline. In this study the intrinsic birefringence of the smectic phase was determined. Tapes wit

The determination of the isotacticity of
The determination of the isotacticity of polypropylene in the 90โ€“100% range by infrared spectroscopy
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An infrared method has been developed for the determination of the isotacticity of polypropylene in the 90-100~o range. The method requires the annealing of thin films a t 165-167ยฐC. for 3 hr. in an inert at>mosphere, followed by slow cooling to room temperature. For approximate answers the ratio of

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Physical aging studies were made using commercial and laboratory samples of isotactic polypropylene. Linear and nonlinear viscoelastic responses were measured after quenching the glass from above the glass transition temperatures to below the glass transition. Results show that aging is not eliminat

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In order to elucidate the origin of luminescent species in unstabilized commercial isotactic polypropylene (IPP), effects of hexane extraction and exposure of the extracted IPP film to the atmosphere on both fluorescence and phosphorescence emissions were examined. Fluorescence emission from the une

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The morphology of irradiated isotactic polypropylene
โœ X. C. Zhang; R. E. Cameron ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 301 KB ๐Ÿ‘ 1 views

The research in this article explores the response of semicrystalline isotactic polypropylene to gamma radiation in air, and relates the morphological changes of the polymer to corresponding changes in mechanical properties. The effect of the initial morphology of the polymer on its response to irra