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.

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

Preparation, Characterization of Substituted Aromatic Heterocyclic Phosphate Salts and the Application in Isotactic Polypropylene

2013 ◽  
Vol 652-654 ◽  
pp. 463-469
Author(s):  
Li Juan Long ◽  
Wen Tao He ◽  
Min Min Zhang ◽  
Kai Zhang ◽  
Min He ◽  
...  
Keyword(s):  
Optical Properties ◽  
Isotactic Polypropylene ◽  
Crystallization Temperature ◽  
Nucleating Agent ◽  
Nucleating Agents ◽  
Absorption Bands ◽  
Nucleation Effect ◽  
Stretching Vibration ◽  
Phosphate Salts ◽  
Aromatic Heterocyclic

Substituted aromatic heterocyclic phosphate salts were synthesized by a new method and characterized by fourier transform infrared spectroscopy(FT-IR) and thermogravimetry (TG) method. The characteristic absorption bands ascribed to the stretching vibration of P=O group and P-O group verify the successful synthesis of substituted aromatic heterocyclic phosphate salts. When compared with sodium salt, the thermal stability of other salts declines. Their nucleation effects on isotactic polypropylene(iPP) were investigated with differential scanning calorimeter(DSC) and influences on mechanical, optical properties of iPP were also studied. The DSC result shows that with 0.15wt% nucleating agents incorporated into iPP, monovalent salts have a good performance, bivalent salts have less nucleation effect on the crystallization temperature. But the mass fraction of crystallinity of iPP with manganese salt could be increased by 5.2% even it has a weak ability relatively on crystallization temperature. And the mechanical and optical properties of iPP with manganese salt almost reach to iPP containing lithium salt. The results demonstrate that bivalent manganses salt is a kind of new effective nucleating agent when designing compound nucleating agents.

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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