Enhanced dielectric properties of sandwich‐structured biaxially oriented polypropylene by grafting hyper‐branched aromatic polyamide as surface layers

2020 ◽  
Vol 137 (34) ◽  
pp. 48990 ◽  
Author(s):  
Chengcheng Han ◽  
Xianhong Zhang ◽  
Dong Chen ◽  
Yuhong Ma ◽  
Changwen Zhao ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Aromatic Polyamide ◽  
Surface Layers ◽  
Biaxially Oriented Polypropylene ◽  
Oriented Polypropylene

scholarly journals Morphology Development, Structure and Dielectric Properties of Biaxially Oriented Polypropylene

2017 ◽  
Author(s):  
Ilkka Rytöluoto ◽  
Mikael Ritamäki ◽  
Antonis Gitsas ◽  
Satu Pasanen ◽  
Kari Lahti
Keyword(s):  
Dielectric Properties ◽  
Raw Materials ◽  
Melting Behavior ◽  
Film Structure ◽  
Structural Defects ◽  
Morphological Development ◽  
Biaxially Oriented Polypropylene ◽  
Dielectric Performance ◽  
Oriented Polypropylene ◽  
Polymorphic Composition

<p>This paper outlines our recent study on effects of cast film extrusion and biaxial orientation on the morphological development and dielectric performance of biaxially oriented polypropylene (PP) films based on two capacitor-grade isotactic PP (iPP) raw materials. Results on polymorphic composition, melting behavior, microstructure and dielectric properties are reported. Morphological development during film manufacturing is found to have a profound effect on film structure and dielectric characteristics. Formation of structural defects was traced back to beta --&gt; alfa crystal transformation upon biaxial stretching.</p>

scholarly journals Practical Notes on the Measurement and Interpretation of Thermally Stimulated Discharge Currents in Biaxially Oriented Polypropylene

2019 ◽  
pp. 64-69
Author(s):  
Ilkka Rytöluoto ◽  
Minna Niittymäki ◽  
Kari Lahti
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Space Charge ◽  
High Field ◽  
Short Term ◽  
Depolarization Current ◽  
Deep Traps ◽  
Biaxially Oriented Polypropylene ◽  
Oriented Polypropylene ◽  
Thermally Stimulated Depolarization

The measurement and interpretation of high-field thermally stimulated depolarization current (TSDC) of capacitor-grade biaxially oriented polypropylene (BOPP) films are investigated in order to facilitate the derivation of trap parameters. Two main relaxations associable with the glass transition and detrapping of space charge from deep traps are observed, and their dependence on the polarization/depolarization conditions are studied. The complex bipolar nature of the space charge relaxation makes the derivation of trap parameters challenging. Lastly, a brief attempt is made to correlate the TSDC features with morphology and other short-term dielectric properties.

Study on rough-surface biaxially oriented polypropylene film. II. Influence of stretching conditions

1988 ◽  
Vol 36 (5) ◽  
pp. 995-1009 ◽  
Author(s):  
Mitsuyoshi Fujiyama ◽  
Yoshimasa Kawamura ◽  
Tetsuo Wakino ◽  
Tomomi Okamoto
Keyword(s):  
Rough Surface ◽  
Polypropylene Film ◽  
Biaxially Oriented Polypropylene ◽  
Oriented Polypropylene

Oxygen permeability of biaxially oriented polypropylene films

2008 ◽  
Vol 48 (4) ◽  
pp. 642-648 ◽  
Author(s):  
Y.J. Lin ◽  
P. Dias ◽  
H.Y. Chen ◽  
S. Chum ◽  
A. Hiltner ◽  
...  
Keyword(s):  
Oxygen Permeability ◽  
Biaxially Oriented Polypropylene ◽  
Oriented Polypropylene ◽  
Polypropylene Films
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