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Fuming nitric acid treatment of isotactic polypropylene film

I. Effects of selective oxidation on proton spin-lattice and spin-spin relaxation times

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Abstract

Fuming nitric acid treatment has been made on a melt-quenched and an annealed isotactic polypropylene film. The treated samples were characterized by measurements of weight loss, density, molecular weight, spin-lattice,T 1, and spin-spin,T 2, relaxation times. Concurrent with the increases in weight loss, density and a decrease in molecular weight, increases inT 1l andF c , a fraction of crystalline region, and decreases inT 2a andF a , a fraction of amorphous region, were observed as a consequence of the decrease in an amount of noncrystalline portions. However, unexpected fall inT 1l was also observed after about 2–3 hr of treatment time. These observations were discussed by the structural changes that took place during acid etching.

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  1. H. Tanaka

    Present address: Macromolecular Research Laboratory, Faculty of Engineering, Yamagata University, Japan

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    Tanaka, H. Fuming nitric acid treatment of isotactic polypropylene film. Colloid & Polymer Sci 260, 1101–1106 (1982). https://doi.org/10.1007/BF01411228

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    • DOI: https://doi.org/10.1007/BF01411228

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