✦ LIBER ✦

NMR study of syndiotactic polypropylene and a comparison with isotactic and atactic polypropylene

✍ Scribed by A. Chierico; G. Del Nero; G. Lanzi; E.R. Mognaschi

Publisher: Elsevier Science
Year: 1966
Tongue: English
Weight: 400 KB
Volume: 2
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(66)90015-2

No coin nor oath required. For personal study only.

✦ Synopsis

Ala~a~tet--Syndiotactic polypropylene has been studied by investigation of NMR line-width and second moment at various temperatures. Results for the syndiotactic material are compared with those for atactic and isotactic polypropylene. Line width and second moment of the absorption line were evaluated for temperatures between -196 ° and 100 °. Activation energies were calculated for the main transition. There was evidence that, from the point of view of NMR, the behaviour of the syndiotactic polymer lies between those of the atactic and isotactic polymers.

📜 SIMILAR VOLUMES

Syndiotactic polystyrene-b-atactic polyp

Syndiotactic polystyrene-b-atactic polypropylene block copolymer alloy as a compatibilizer for syndiotactic polystyrene/isotactic polypropylene blends

✍ Rui Chen; Qing Wu; Fangming Zhu; Shangan Lin 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 269 KB 👁 1 views

Isothermal crystallization kinetics and

Isothermal crystallization kinetics and morphology development of isotactic polypropylene blends with atactic polypropylene

✍ Jean-Hong Chen; Yu-Lun Chang 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 717 KB

E.s.r. study of γ-irradiated isotactic a

E.s.r. study of γ-irradiated isotactic and atactic polypropylene

✍ Toshitami Ooi; Masami Shiotsubo; Yoshimasa Hama; Kenichi Shinohara 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 418 KB

Directional solidification of isotactic

Directional solidification of isotactic and atactic polypropylene blends

✍ Eric J. Kaiser; John J. Mcgrath; André Bénard 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 606 KB

The directional solidification of polypropylene (PP) films results in an oriented semicrystalline microstructure and may offer a method to improve the properties of a product. The directional solidification of isotactic PP samples blended with 0% to 50% atactic PP, by mass, was therefore studied. Th

Thermal degradation kinetics of isotacti

Thermal degradation kinetics of isotactic and atactic polypropylene

✍ Ravi Kumar; Giridhar Madras 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 124 KB 👁 2 views

Effects of annealing and atactic fractio

Effects of annealing and atactic fraction on structural properties of isotactic polypropylene

✍ Hiroshi Tanaka; Fumie Kōrogi 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 358 KB

Effects of annealing and atactic fraction on structural properties of isotactic polypropylene were investigated using various methods which included X-ray, NMR and DSC. Annealing at elevated temperatures results in considerable increases in crystallinity, ~m, crystal thickness, lc, heat of fusion, A