Great toughness reinforcement of isotactic polypropylene/elastomer blends with quasi-cocontinuous phase morphology by traces of β-nucleating agents and carbon nanotubes

2018 ◽  
Vol 167 ◽  
pp. 277-284 ◽  
Author(s):  
Yanhui Chen ◽  
Zhiqiang Wu ◽  
Qian Fan ◽  
Song Yang ◽  
Erchao Song ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Isotactic Polypropylene ◽  
Phase Morphology ◽  
Nucleating Agents

scholarly journals Effect of Different Nucleating Agents on the Crystallization of Ziegler-Natta Isotactic Polypropylene

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Felipe Avalos-Belmontes ◽  
Luis Francisco Ramos-deValle ◽  
Adriana Berenice Espinoza-Martínez ◽  
Juan Guillermo Martínez-Colunga ◽  
Eduardo Ramírez-Vargas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Isotactic Polypropylene ◽  
Crystallization Temperature ◽  
Carbon Nanoparticles ◽  
Crystallization Process ◽  
Life Time ◽  
Nucleating Agent ◽  
Crystalline Form ◽  
Nucleating Agents

Ziegler-Natta isotactic polypropylene (iPP) was melt mixed with four different nucleating agents (carbon nanotubes (CNT), carbon nanofibers (CNF), lithium benzoate (LiBe), and a sorbitol derivative (Millad)) in order to study their effect on the crystallization of iPP. It was found that the four different nucleating agents promote the alpha crystalline form. At 0.01 wt%, the carbon nanoparticles produced the higher crystallization temperature “Tc” (~119°C), whereas, at 0.10 wt%, LiBe and Millad produced a markedly higherTc(~125°C).Tcof pure iPP was 111°C. With 0.1 wt% nucleating agent, at 120°C, the crystallization half-life time of PP, when using LiBe or Millad, was 15 times faster than for pure PP, whereas, when using carbon nanoparticles, it was 20–25 times faster. At 135°C, with 0.01 wt% nucleating agent, the isothermal crystallization process of iPP was completed after 25 min, as well as with Millad. With LiBe, it was completed after just 15 min and, with any of the carbon nanoparticles, it was practically over after only a couple of minutes.

scholarly journals Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

2019 ◽  
Vol 55 (4) ◽  
pp. 1436-1450 ◽  
Author(s):  
Jan Broda ◽  
Marcin Baczek ◽  
Janusz Fabia ◽  
Dorota Binias ◽  
Ryszard Fryczkowski
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Isotactic Polypropylene ◽  
Reduced Form ◽  
Pimelic Acid ◽  
Nucleating Agents ◽  
Scanning Calorimetry ◽  
Functionalized Graphene Oxide ◽  
Reduced Graphene ◽  
Carboxylic Groups

Abstract During the investigations, functionalization of graphene oxide synthesized using modified Hummers’ method and its reduced form was performed. Mixtures of graphene oxide and reduced graphene oxide with pimelic acid and calcium hydroxide were prepared for functionalization. During the reaction, the molecules of pimelic acid were attached to the surface of graphene sheets. By forming links between the carboxylic groups of pimelic acid and graphene oxide, the durable connection was achieved. The functionalized graphene oxide and the reduced graphene oxide were used as additives in isotactic polypropylene crystallization. The influence of additives on crystallisation in non-isothermal conditions was examined using polarized optical microscopy and differential scanning calorimetry. The effect of the additives on the polypropylene structure was analysed using wide-angle X-ray scattering. For both functionalized compounds, the nucleating ability towards β-form of polypropylene was detected. Both additives showed the increase in the nucleation rate and promotion of growth of the β-form crystals. Nucleation efficiency similar to other nucleating agents used in the crystallization of the β-form of polypropylene was revealed.

Competition between α and β Crystallization in Isotactic Polypropylene: Effect of Nucleating Agents Composition

2015 ◽  
Vol 30 (3) ◽  
pp. 344-349
Author(s):  
S.-W. Wang ◽  
Y.-T. Leng ◽  
J. Jiang ◽  
G.-Q. Zheng ◽  
Q. Li
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agents

The Effect of Acid-Treatment of Carbon Nanotubes on the Thermal Kinetics of Isotactic Polypropylene

2011 ◽  
Vol 50 (4) ◽  
pp. 665-678 ◽  
Author(s):  
Abdolhosein Fereidoon ◽  
Mahmood Hemmati ◽  
Naser Kordani ◽  
Mohammad Kameli ◽  
Morteza Ghorbanzadeh Ahangari ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Isotactic Polypropylene ◽  
Acid Treatment ◽  
Thermal Kinetics ◽  
Kinetics Of
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