The role of dry and wet isothermal annealing treatment on the structure and the mechanical properties of isotactic polypropylene fibers

2011 ◽  
Vol 124 (4) ◽  
pp. 3037-3050 ◽  
Author(s):  
Ismail Karacan ◽  
Hüseyin Benli
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Isothermal Annealing ◽  
Annealing Treatment ◽  
Polypropylene Fibers

Correlation between mechanical properties and orientation of the crystalline and mesomorphic phases in isotactic polypropylene fibers

Polymer ◽  
2011 ◽  
Vol 52 (24) ◽  
pp. 5630-5643 ◽  
Author(s):  
Guillaume Colombe ◽  
Simon Gree ◽  
Olivier Lhost ◽  
Marc Dupire ◽  
Martin Rosenthal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Polypropylene Fibers

scholarly journals The role of the interfacial layer in time -temperat ure dependence of the electrical resistance of hi gh-density polyethylene /carbon black composites

2016 ◽  
Vol 11 (3) ◽  
pp. 17-30
Author(s):  
N. N. Komova
Keyword(s):  
Activation Energy ◽  
Fractal Dimension ◽  
Carbon Black ◽  
Electrical Resistance ◽  
Interfacial Layer ◽  
Isothermal Annealing ◽  
Solid Phase ◽  
Initial Period ◽  
Annealing Treatment

In order to explain the time-temperature dependence of the electrical resistance of HDPE filled with carbon black, a model is proposed, in which an important role is played by the interfacial layer between the solid-phase filler and the polymer matrix. It is shown that the change in the structure of the macromolecules in the interfacial layer can be characterized using fractal concepts. The fractal dimension increases as the size of the filler particles decreases, and this is accompanied by a decrease in electrical resistance. During isothermal annealing treatment of the samples the fractal dimension of the interfacial layer is changed from 2.3 to 3. Correlations of the observed parameters are presented. The activation energy of increasing resistance in the initial period of the sample treatments is calculated. It is shown that the electrostatic field restrains the increase of the fractal dimension of the interfacial layer and the change in the resistance of the filled systems.

scholarly journals Unique Slow Crack Growth Behavior of Isotactic Polypropylene: The Role of Shear Layer-Spherulites Layer Alternated Structure

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2746
Author(s):  
Mingjin Liu ◽  
Jiaxu Luo ◽  
Jin Chen ◽  
Xueqin Gao ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Shear Layer ◽  
Crack Growth ◽  
Isotactic Polypropylene ◽  
Slow Crack Growth ◽  
Crack Growth Behavior ◽  
Polymer Science ◽  
The Past ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

With the development of polymer science, more attention is being paid to the longevity of polymer products. Slow crack growth (SCG), one of the most important factors that reveal the service life of the products, has been investigated widely in the past decades. Here, we manufactured an isotactic polypropylene (iPP) sample with a novel shear layer–spherulites layer alternated structure using multiflow vibration injection molding (MFVIM). However, the effect of the alternated structure on the SCG behavior has never been reported before. Surprisingly, the results showed that the resistivity of polymer to SCG can be enhanced remarkably due to the special alternated structure. Moreover, this sample shows unique slow crack propagation behavior in contrast to the sample with the same thickness of shear layer, presenting multiple microcracks in the spherulites layer, which can explain the reason of the resistivity improvement of polymer to SCG.

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