~C spin-lattice relaxation time, T~, t3C and tH spin-lattice relaxation times in the rotating frame, Ttp(13C) and Tip(IH), and the dipolar dephasing behaviour of methylene, methine and methyl carbons of annealed(monoclinic) and quenched(smectic) isotactic polypropylene films were measured using the
Mechanical relaxation in isotactic polypropylene
β Scribed by B.E. Read
- Book ID
- 107846184
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 645 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0032-3861
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The mechanical properties of stereoblock polypropylene/isotactic polypropylene blends have been analyzed a t different temperatures and at large deformations. The samples at a lower content of isotactic polypropylene show good elastic properties, both in terms of deformation reversibility and in ter
Measurements of a.c. impedance were carried out in the frequency range 1 Hz to lo6 Hz at room temperature on isotropic and die-drawn isotactic polypropylene. It was found that the a.c. impedance decreases with increasing draw ratio in the frequency range 1 Hz to lo4 Hz and then becomes independent o