NMR, differential scanning calorimetry, and Fourier transform infrared characterization of the crystalline degree and crystallite dimensions of ethylene runs in isotactic polypropylene/ethylene–propylene copolymer blends (iPP/EP)
✍ Scribed by F. Lauprêtre; S. Bebelman; D. Daoust; J. Devaux; R. Legras; J. L. Costa
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 224 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
High-resolution solid-state 13 C-NMR, differential scanning calorimetry, and Fourier transform infrared spectroscopy were used to compare the very low crystalline degree and crystallite dimensions of ethylene runs in a series of isotactic polypropylene/ethylene-propylene copolymer blends exhibiting a range of properties. Results obtained from the three techniques on samples with the same thermal history are in a satisfying qualitative agreement. They show that the morphology of the polyethylene domains is only very slightly dependent on the viscosity ratio of the two blend components. On the opposite, it is largely governed by the ethylene content of the ethylene-propylene copolymer.