Self-Nucleation of β-Form Isotactic Polypropylene Lamellar Crystals in Thin Films

2021 ◽  
Author(s):  
Binghua Wang ◽  
Gang Wang ◽  
Shanshan He ◽  
Taicheng Sun ◽  
Jingbo Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Isotactic Polypropylene ◽  
Lamellar Crystals

Local Orientation of Chains at Crystal/Amorphous Interfaces Buried in Isotactic Polypropylene Thin Films

2021 ◽  
Author(s):  
Daisuke Kawaguchi ◽  
Kentaro Yamamoto ◽  
Tatsuki Abe ◽  
Naisheng Jiang ◽  
Tadanori Koga ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Isotactic Polypropylene ◽  
Polymer Chains ◽  
Scientific Interest ◽  
Local Orientation ◽  
Polymer Devices ◽  
Film Polymer

A better understanding of the aggregation states of polymer chains in thin films is of pivotal importance for developing thin film polymer devices in addition to its inherent scientific interest....

Carrier hopping transport in semi-crystalline isotactic polypropylene thin films: A revisit to the overestimated hopping distance

Polymer ◽  
2019 ◽  
Vol 179 ◽  
pp. 121650 ◽  
Author(s):  
Xu Zheng ◽  
Yizhu Wang ◽  
Le Zhang ◽  
Jianying Li ◽  
Shengtao Li
Keyword(s):  
Thin Films ◽  
Isotactic Polypropylene ◽  
Hopping Transport

Visualization by STEM annular DF of intralamellar shear in polyethylene

1983 ◽  
Vol 41 ◽  
pp. 26-27
Author(s):  
W. Wade Adams
Keyword(s):  
Thin Films ◽  
Tensile Deformation ◽  
Annealed Film ◽  
Gauge Length ◽  
Main Beam ◽  
Draw Direction ◽  
Lamellar Crystals ◽  
High Orientation ◽  
In Situ Deformation

Thin films of polyethylene (PE) with high orientation have recently been prepared by “melt-drawing”. This process produces long crystalline lamellae normal to the draw direction and with the chain axis [00ℓ] parallel to the draw direction (Figure 1).Thin films were prepared from a 0.5% solution of high density PE (Marlex 6003, Mw=2×l05) in xylene, which was drawn from a glass slide at 125°C. The films were annealed on glycerol at 125°C for two hours, then were placed on specially fabricated soft copper deformation grids. In-situ deformation was performed in a tensile deformation stage of a JE0L 100CX STEM. The initial gauge length was 0.5mm, with a strain rate of 0.1min−1.Figure 1 shows a bright field (BF) CTEM image of an annealed film. Crystals properly oriented for diffraction appear black, while non-Bragg-oriented lamellar crystals are grey. The interlamellar zones (amorphous regions) appear as bright areas for underfocus conditions since innerpotential of the crystalline phase is approximately one volt larger than that of the amorphous phase. The bright white “ghosts” are diffraction images displaced by defocus from their corresponding main beam images in the direction of the appropriate diffraction vector.

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