Study on the Thermodynamic Interactions between Isotactic Polypropylene and Ethylene−1-Hexene Random Copolymers by SANS

2000 ◽  
Vol 33 (26) ◽  
pp. 9712-9719 ◽  
Author(s):  
Motohiro Seki ◽  
Hisao Uchida ◽  
Youichi Maeda ◽  
Shinichi Yamauchi ◽  
Katsuhiko Takagi ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Random Copolymers

Yield behavior of random copolymers of isotactic polypropylene

Polymer ◽  
2017 ◽  
Vol 129 ◽  
pp. 235-246 ◽  
Author(s):  
Finizia Auriemma ◽  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Anna Malafronte ◽  
Miriam Scoti ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Random Copolymers ◽  
Yield Behavior

Molecular View of Properties of Random Copolymers of Isotactic Polypropylene

2016 ◽  
pp. 45-92 ◽  
Author(s):  
Finizia Auriemma ◽  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Anna Malafronte ◽  
Miriam Scoti ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Random Copolymers

scholarly journals High-Stress Shear-Induced Crystallization in Isotactic Polypropylene and Propylene/Ethylene Random Copolymers

2013 ◽  
Vol 46 (7) ◽  
pp. 2671-2680 ◽  
Author(s):  
Zhe Ma ◽  
Lucia Fernandez-Ballester ◽  
Dario Cavallo ◽  
Tim Gough ◽  
Gerrit W. M. Peters
Keyword(s):  
Isotactic Polypropylene ◽  
High Stress ◽  
Random Copolymers ◽  
Induced Crystallization

scholarly journals Systematic Investigation on the Structure-Property Relationship in Isotactic Polypropylene Films Processed via Cast Film Extrusion

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1636 ◽  
Author(s):  
Federico Di Sacco ◽  
Markus Gahleitner ◽  
Jingbo Wang ◽  
Giuseppe Portale
Keyword(s):  
Isotactic Polypropylene ◽  
Single Site ◽  
Random Copolymers ◽  
Minor Effect ◽  
Structure Property ◽  
Melt Temperature ◽  
Film Extrusion ◽  
Line Speed ◽  
Cast Film ◽  
Roll Temperature

The effect of cast film extrusion processing conditions, such as the chill-roll temperature, temperature of the melt, and line speed, on the structure of different isotactic polypropylene homo- and random copolymers has been investigated by means of Small- and Wide-Angle X-ray Scattering (SAXS and WAXS) and correlated to stiffness and haze. Stiffness and transparency have been found to be strongly dependent on the temperature of the chill-roll. Interestingly, line speed has been found to affect the total crystallinity when the chill-roll temperature is increased, while an overall minor effect of the melt temperature was found for all cast films. The polymer characteristics, defined by the catalyst nature and comonomer content, affect the final material performance, with the single-site catalyzed grades performing better in both mechanics and optics. Haze levels were found to correlate with the mesophase content rather than to α-crystallinity and to be dependent on the domain size for all grades. The remarkably low haze levels reached by the single-site grade with higher isotacticity can arise from high nucleation rate and orientational effects, which ultimately yield smaller and smoother scattering domains.

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