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

scholarly journals Crystallization behavior and optical properties of isotactic polypropylene filled with α-nucleating agents of multilayered distribution

RSC Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 387-393
Author(s):  
Shanshan Luo ◽  
Liangqiang Wei ◽  
Jing Sun ◽  
Anrong Huang ◽  
Shuhao Qin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Nucleating Agents ◽  
Multilayered Composites ◽  
Extrusion Technology

Isotactic polypropylene (iPP)-based multilayered composites containing alternating layers of pure iPP and α-nucleating agents (α-NAs)-filled iPP (αPP) were fabricated through layer-multiplying co-extrusion technology.

New understanding in the influence of melt structure and β-nucleating agents on the polymorphic behavior of isotactic polypropylene

RSC Advances ◽  
2014 ◽  
Vol 4 (56) ◽  
pp. 29514-29526 ◽  
Author(s):  
Jian Kang ◽  
Gengsheng Weng ◽  
Zhengfang Chen ◽  
Jinyao Chen ◽  
Ya Cao ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleation Mechanism ◽  
Nucleating Agents ◽  
Polymorphic Behavior ◽  
Two Stage ◽  
Melt Structure ◽  
Ordered Structures

Schematic illustration of the two-stage β-nucleation mechanism of β-iPP nucleated with dual-selective β-nucleating agents and the role of ordered structures.

scholarly journals Investigation on the Effects of MXene and β-Nucleating Agent on the Crystallization Behavior of Isotactic Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2931
Author(s):  
Wanxin Peng ◽  
Jian Kang ◽  
Xiuduo Song ◽  
Yue Zhang ◽  
Bo Hu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Nucleating Agent ◽  
Melting Behavior ◽  
Nucleating Agents ◽  
Structure And Morphology ◽  
Β Phase ◽  
Α Phase

The effects of MXene on the crystallization behavior of β-nucleated isotactic polypropylene (iPP) were comparatively studied. The commonly used MXene Ti3C2Tx was prepared by selective etching and its structure and morphology were studied in detail. Then MXene and a rare earth β-nucleating agent (NA) WBG-II were nucleated with iPP to prepare samples with different polymorphic compositions. The crystallization, melting behavior, and morphologies of neat iPP, iPP/MXene, iPP/WBG-II, and iPP/MXene/WBG-II were comparatively studied. The crystallization behavior analysis reveals that a competitive relationship exists between MXene and WBG-II when they were compounded as α and β nucleating agents. In the system, the β-nucleation efficiency (NE) of WBG-II is higher than α-NE of MXene. The β-phase has relatively low thermal stability and would transform to α-phase when cooled below a critical temperature.

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.

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