Colloid and Polymer Science

, Volume 260, Issue 12, pp 1101–1106 | Cite as

Fuming nitric acid treatment of isotactic polypropylene film

I. Effects of selective oxidation on proton spin-lattice and spin-spin relaxation times
  • H. Tanaka
Polymer Science

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,T1, and spin-spin,T2, relaxation times. Concurrent with the increases in weight loss, density and a decrease in molecular weight, increases inT1l andF c , a fraction of crystalline region, and decreases inT2a andF a , a fraction of amorphous region, were observed as a consequence of the decrease in an amount of noncrystalline portions. However, unexpected fall inT1l 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.

Key words

Fuming Nitric Acid Isotactic Polypropylene Proton Magnetic Relaxation Spin-Lattice Relaxation Time Spin-Spin Relaxation Time 

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Copyright information

© Steinkopff 1982

Authors and Affiliations

  • H. Tanaka
    • 1
  1. 1.Macromolecular Research Laboratory, Faculty of EngineeringYamagata UniversityJapan

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