𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Features of the hedritic morphology of β-isotactic polypropylene studied by atomic force microscopy

✍ Scribed by Dorina Trifonova-Van Haeringen; Jozsef Varga; Gottfried W. Ehrenstein; G. Julius Vancso

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
456 KB
Volume
38
Category
Article
ISSN
0887-6266

No coin nor oath required. For personal study only.

✦ Synopsis

The lamellar organization of melt-crystallized ␤-isotactic polypropylene was studied by atomic force microscopy (AFM) after permanganic etching. Hedritic objects grown at a high crystallization temperature (140 -143 °C) were investigated. Essential features of the hedritic development were revealed by the characteristic projections exposed at the sample surface. A three-dimensional view of the morphology was obtained by AFM. Hedritic growth proceeded mainly by branching around screw dislocations resulting in new lamellae that further developed. Successive lamellar layers often diverged. Deviation from the planar lamellar habit was observed, varying with the position within the hedrite. Twisting of the lamellae also was observed occasionally in the vicinity of the screw dislocations.

📜 SIMILAR VOLUMES

A morphological study of melt-spun polyp
A morphological study of melt-spun polypropylene filaments by atomic force microscopy
✍ Joni Hautojärvi; Antti Leijala 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 465 KB 👁 2 views

Surface morphology of melt-spun polypropylene (PP) filaments, spun from an additive-free PP powder and from a commercial-grade PP with different draw ratios, were examined with atomic force microscopy (AFM). The surface morphology of as-spun filaments was spherulitic. The gradual transformation of t

Stereoregular polypropylenes studied by
Stereoregular polypropylenes studied by time-of-flight secondary ion mass spectrometry (ToF-SIMS) and atomic force microscopy (AFM)
✍ Xu, Keyang; Gusev, Arkady I.; Hercules, David M. 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 424 KB 👁 2 views

Time-of-Ñight secondary ion mass spectrometry (ToF-SIMS) and atomic force microscopy (AFM) were utilized to characterize polypropylenes of di †erent stereoregularity (atactic, syndiotactic and isotactic) deposited on gold-or silver-coated mica surfaces. The AFM images clearly revealed distinctive su