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

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.

The influence of crystal structures of nucleating agents on the crystallization behaviors of isotactic polypropylene

2006 ◽  
Vol 285 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Wei-Min Hou ◽  
Gang Liu ◽  
Jian-Jun Zhou ◽  
Xia Gao ◽  
Yan Li ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Isotactic Polypropylene ◽  
Nucleating Agents ◽  
Crystallization Behaviors

Effects of melt structure on crystallization behavior of isotactic polypropylene nucleated with α/β compounded nucleating agents

2014 ◽  
Vol 132 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Qiyan Zhang ◽  
Zhengfang Chen ◽  
Bing Wang ◽  
Jinyao Chen ◽  
Feng Yang ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Nucleating Agents ◽  
Melt Structure
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