Comparison of structure development in quiescent crystallization, die extrusion and melt spinning of isotactic polypropylene and its compounds containing fillers and nucleating agents

2001 ◽  
Vol 41 (7) ◽  
pp. 1292-1298 ◽  
Author(s):  
Yishan Yu ◽  
James L. White
Keyword(s):  
Isotactic Polypropylene ◽  
Melt Spinning ◽  
Nucleating Agents ◽  
Structure Development ◽  
Die Extrusion

Melt spinning of isotactic polypropylene: Structure development and relationship to mechanical properties

1977 ◽  
Vol 21 (11) ◽  
pp. 3003-3022 ◽  
Author(s):  
Hari P. Nadella ◽  
Helen M. Henson ◽  
Joseph E. Spruiell ◽  
James L. White
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Melt Spinning ◽  
Structure Development

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
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